Publications

2019

J. A. Riousset, A. Nag, C. Palotai, Scaling of conventional breakdown threshold: Impact for predictions of lightning and TLEs on Earth, Venus, and Mars, Icarus 338 (2020), https://doi.org/10.1016/j.icarus.2019.113506, 2019.

M. M. F. Saba, Ferro, M. A. S., Cuadros, E. T., Custódio, D. M., Nag, A., Schumann, C., et al., High‐speed video observation of a dart leader producing X‐rays. Journal of Geophysical Research: Space Physics, 124, https://doi.org/10.1029/2019JA027247, 2019.

N. Watanabe, A. Nag, G. Diendorfer, H. Pichler, S. Schulz, V. A. Rakov, H. K. Rassoul, Characteristics of currents in upward lightning flashes initiated from the Gaisberg Tower, IEEE TEMC, Special Issue on Lightning, doi: 10.1109/TEMC.2019.2916047, 2019.

L. D. Boggs, N. Liu, M. Peterson, S. Lazarus, M. Splitt, F. Lucena, A. Nag, and H. K. Rassoul, First observations of gigantic jets from geostationary orbit. Geophysical Research Letters, 46, https://doi.org/10.1029/2019GL082278, 2019.

B. Mailyan , A. Nag, M. S. Briggs, Studying terrestrial gamma–ray flashes with Fermi gamma–ray burst monitor and lightning locating systems, USNC–URSI National Radio Science Meeting, Boulder, CO, Jan 9-12, 2019.

2018

N. Watanabe, A. Nag, G. Diendorfer, H. Pichler, W. Schulz, H. K. Rassoul, Polarity of Current from Upward Lightning Initiated from the Gaisberg Tower, AGU meeting, Washington, D.C, USA, 10 – 14 December 2018.

J. A. Riousset, A. Nag, C. Palotai, Scaling of conventional breakdown threshold: Impact for predictions of lightning and TLEs on Earth, Venus, and Mars, AGU Fall meeting, Washington, D.C., USA, 10 – 14 December 2018.

M. Bagheri, C. Sterpka, J. Dwyer, N. Liu, D. Perham, K. Morman, M. Widholm, C. Bancroft, J. Legere, P. Bloser, M. Austin, M. Plaisir, A. Nag, S. Arabshahi, J. Chiappa, S. Lazarus, M. Splitt, and H. Rassoul, Balloon-borne instrumentation for detection of gamma-ray glows from lightning, AGU Fall Meeting, Washington, D.C. 10-14 Dec, 2018.

N. Watanabe, A. Nag, G. Diendorfer, H. Pichler, W. Schulz, Current and Electric Field Changes Associated with the Initial Stage of Upward Lightning, 34th International Conference on Lightning Protection, Rzeszow, Poland, 2 – 7 September 2018.

B. Mailyan, A. Nag, M. Murphy, R. K. Said, M. S. Briggs, J. R. Dwyer, E. Cramer, O. J. Roberts, M. Stanbro, H. K. Rassoul, N. Watanabe, Investigating Radio Emissions Associated with Terrestrial Gamma-ray Flashes using NLDN, GLD360 and Fermi-GBM, XVI International Conference on Atmospheric Electricity, Nara, Japan, 17 – 22 June 2018.

A. Nag and K. L. Cummins, Magnetic field rise times of negative lightning first return strokes over land and ocean, Geophysical Research Letters, 45, https://doi.org/10.1029/2018GL080038, 2018.

J. A. Riousset, A. Nag, C. Palotai, Scaling of dielectric breakdown thresholds on Earth, Mars, and Venus: Impact for predictions of extraterrestrial TLEs and lightning discharges, AAS/Division for Planetary Sciences Meeting Abstracts, 2018.

B. Mailyan, A. Nag, R.K. Said, M.J. Murphy, M.S. Briggs, J.R. Dwyer, E. Cramer, O.J. Roberts, M. Stanbro, and H.K. Rassoul, Characteristics of lightning associated with terrestrial gamma-ray flashes in various geographical regions, 25th International Lightning Detection Conference & 7th International Lightning Meteorology Conference, Ft. Lauderdale, Florida, 12 March, 2018.

N. Watanabe, A. Nag, G. Diendorfer, H. Pichler, W. Schulz, H. K. Rassoul, Polarity of Current from Upward Lightning Initiated from the Gaisberg Tower, AGU Fall meeting, Washington, D.C, USA, 10 – 14 December 2018.

L. D. Boggs, Y. Liu, M. Austin, F. Aguirre, J. Tilles, and H. K. Rassoul, A high-speed spectroscopy system for observing lightning and transient luminous events, NSF CEDAR workshop, Santa Fe, NM, June 25-29, 2018.

F. Shi, Y. Liu, and H. K. Rassoul, 3-D modeling of two interacting streamers, URSI National Radio Science Meeting, Boulder, CO, January 4-7,2018.

2017

N. Watanabe, A. Nag, G. Diendorfer, H. Pichler, W. Schulz, and H. K. Rassoul, Characteristics of Current and Electric Field Associated with the Initial Stage of Upward Lightning, AGU meeting, New Orleans, USA, 11 – 15 December 2017.

N. Watanabe, A. Nag, G. Diendorfer, H. Pichler, W. Schulz, Close and Distant electric Fields due to Lightning Attaching to the Gaisberg Tower, 2017 International symposium on Lightning Protection (XIV SIPDA), Natal, Brazil, 2 – 6 October 2017.

N. Watanabe, A. Nag, G. Diendorfer, H. Pichler, W. Schulz. (2017), Close and Distant Electric Fields due to Lightning Attaching to the Gaisberg Tower, 4th International Symposium Winter Lightning, Joetsu, Japan, 12 – 14 April 2017.

A. Nag and K. L. Cummins, Negative first stroke leader characteristics in cloud-to-ground lightning over land and ocean, Geophys. Res. Lett., 44, doi:10.1002/2016GL072270, 2017.

A. Nag and K. L. Cummins, Negative return stroke characteristics in land-based and oceanic thunderstorms, 10th Asia-Pacific International Conference on Lightning, Krabi, Thailand, May 16-19, 2017.

A. Nag, R. L. Holle, M. J. Murphy, Cloud-to-ground lightning over the Indian subcontinent, 8th Conference on the Meteorological Applications of Lightning Data, Paper 861, 97th American Meteorological Society Annual Meeting, Seattle, Washington, Jan 22-26, 2017.

B. Mailyan, A. Nag, M. Murphy, M. S. Briggs, J. R. Dwyer, E. Cramer, M. Stanbro, O. J.Roberts, and H. K. Rassoul, Characteristics of NLDN-reported radio frequency emissions associated with terrestrial gamma-ray flashes, AGU meeting, New Orleans, USA, 11 – 15 December 2017.

C. Sterpka, M. Bagheri, J. Dwyer, N. Liu, K. Morman, J. Gadbois, A. Bozarth, L. Boggs, B. Mailyan, A. Nag, S. Lazarus, M. Austin, F. Aguirre, J. Colvin, V. Haley, and H. Rassoul, Balloon borne instrumentation for detection of gamma ray glows, abstract #AE33B-2553, AGU Fall Meeting, New Orleans, 11-15 Dec, 2017.

Boggs, L. D., N. Y. Liu, M. Austin, F. Aguirre, J. Tilles, A. Nag, S. M. Lazarus, and H. K. Rassoul, A high-speed spectroscopy system for observing lightning and transient luminous events, AGU Fall Meeting, New Orleans, LA, December 11-15,2017.

Liu, N. Y.,J. Tilles, L. Boggs, A. Bozarth, J. A. Riousset, and H. K. Rassoul, Fractal properties of lightning from high-speed video observations, NSF CEDAR workshop, Keystone Resort, CO, June 18- 23, 2017.

Liu, N. Y., J. Tilles, L. Boggs, A. Bozarth, H. K. Rassoul, and J. A. Riousset, Fractal dimension of cloud- to-ground lightning, URSI National Radio Science Meeting, Boulder, CO, January 4-7, 2017.

Dwyer, J. R., and N. Y. Liu, Calculating HF and VHF emissions from Compact Intracloud Discharges, URSI National Radio Science Meeting, Boulder, CO, January 4-7,2017.

2016

N. Liu, Boggs, L.D., Cummer, S.A, Observation-constrained modeling of the ionospheric impact of negative sprites,Geophys. Res. Lett,., 43,doi: 10.1002/2016GL068256, 2016.

Y. Zhu, V. A. Rakov, M. D. Tran, and A. Nag, A study of National Lightning Detection Network responses to natural lightning based on ground truth data acquired at LOG with emphasis on cloud discharge activity, J. Geophys. Res. Atmos., 121, 14,651â€“14,660, doi:10.1002/2016JD025574, 2016.

B. M. Hare, M. A. Uman, J. R. Dwyer, D.M. Jordan, M. I. Biggerstaff, J. A. Caicedo, F. L. Carvalho, R. A. Wilkes, D. A. Kotovsky, W. R. Gamerota, J. T. Pilkey, T. K. Ngin, R. C. Moore, H. K. Rassoul, S. A. Cummer, J. E. Grove, A. Nag, D. P. Betten, and A. Bozarth, Ground-level observation of a terrestrial gamma ray flash initiated by a triggered lightning, J. Geophys. Res. Atmos., 121, 6511–6533, doi:10.1002/2015JD024426, 2016.

R. L. Holle, N. W. S. Demetriades, and A. Nag, Objective airport warnings over small areas using NLDN cloud and cloud-to-ground lightning data, Weather and Forecasting, Vol. 31, pp. 1061-1069, doi: 10.1175/WAF-D-15-0165.1, 2016.

A. Nag and K. L. Cummins, Characteristics of negative cloud-to-ground lightning over land and ocean, 33rd International Conference on Lightning Protection, Estoril, Portugal, October, 2016.

A. Nag, M.J. Murphy, and J.A. Cramer, Update to the U.S. National Lightning Detection Network, 24th International Lightning Detection Conference & 6th International Lightning Meteorology Conference, 18-21 April, San Diego, California, USA, 2016.

J.D. Hill, C.T. Mata, W. Roeder, and A. Nag, Evaluation of the performance characteristics of MERLIN and NLDN based on two years of ground-truth data from Kennedy Space Center/Cape Canaveral Air Force, 24th International Lightning Detection Conference & 6th International Lightning Meteorology Conference, 18-21 April, San Diego, California, USA, 2016.

W. Schulz, A. Nag, and M.J. Murphy, Relationship between the average number of sensors reporting and the detection efficiency of a network, 24th International Lightning Detection Conference & 6th International Lightning Meteorology Conference, 18-21 April, San Diego, California, USA, 2016.

Y. Zhu, V.A. Rakov, M.D. Tran, and A. Nag, A study of NLDN responses to cloud discharge activity based on ground-truth data, Acquired at the LOG, 24th International Lightning Detection Conference & 6th International Lightning Meteorology Conference, 18-21 April, San Diego, California, USA, 2016.

D. Zhang, K.L. Cummins, A. Nag, and M. Murphy, Evaluation of the National Lightning Detection Network upgrade using the Lightning Imaging Sensor, 24th International Lightning Detection Conference & 6th International Lightning Meteorology Conference, 18-21 April, San Diego, California, USA, 2016.

A. Nag and K. L. Cummins, Negative cloud-to-ground lightning parameters over land and ocean, American Geophysical Union Fall Meeting, San Francisco, December, 2016.

Shi, F., N. Y. Liu,and H. K. Rassoul, 3-D modeling of two interacting streamers, URSI National Radio Science Meeting, Boulder, CO, January 4-7,2017.

Liu, N. Y.,J. Tilles, L. Boggs, A. Bozarth, H. K. Rassoul, and J. A. Riousset, High speed video observations of natural lightning and their implications to fractal description of lightning, AGU Fall Meeting, San Francisco, CA, December 12-16,2016.

Shi, F., N. Y. Liu,and H. K. Rassoul, Three dimensional modeling of streamer interaction, AGU Fall Meeting, San Francisco, CA, December 12-16,2016.

Boggs, L. D., N. Y. Liu,J. A. Riousset, F. Shi, and H. K. Rassoul, Thunderstorm charge structures producing negative gigantic jets, AGU Fall Meeting, San Francisco, CA, December 12-16,2016.

Salem, M., N. Y. Liu, and H. K. Rassoul, The electrical impact of lightning quasi-electrostatic fields on the nighttime lower ionosphere: the case of negative sprite halos, AGU Fall Meeting, San Francisco, CA, December 12-16,2016.

Cramer, E. S., M. S. Briggs, N. Y. Liu,B. Mailyan, H. K. Rassoul, and J. R. Dwyer, Estimation of NOx production from terrestrial gamma-ray flashes, AGU Fall Meeting, San Francisco, CA, December 12-16, 2016.

Boggs, L.D., N.Y. Liu, and H.K. Rassoul, Thunderstorm charge structures producing negative gigantic jets, NSF CEDAR workshop, Santa Fe, NM, June 19-24,2016.

Salem, M., N. Y. Liu, and H. K. Rassoul, The electrical impact of sprite halos on the nighttime lower ionosphere, NSF CEDAR workshop, Santa Fe, NM, June 19-24, 2016.

Liu, N. Y., L. D. Boggs, M. Splitt, S. Lazarus, C. Glenn, H. K. Rassoul, and S. A. Cummer, Rare types of transient luminous events observed above two Florida storms on 12 September 2014, URSI National Radio Science Meeting, Boulder, CO, January 6-9, 2016.

Salem, M., N. Y. Liu,and H. K. Rassoul, Modification of the lower ionospheric conductivity by thunderstorm electrostatic fields, URSI National Radio Science Meeting, Boulder, CO, January 6-9, 2016.

2015

M. D. Tran, V. A. Rakov, S. Mallick, J. R. Dwyer, A. Nag, S. Heckman, A terrestrial gamma-ray flash recorded at the Lightning Observatory in Gainesville, Florida, Journal of Atmospheric and Solar- Terrestrial Physics, 136 (2015), 86–93, 2015.

A. Nag and V. A. Rakov, A unified engineering model of the first stroke in downward negative lightning, J. Geophys. Res. Atmos., 121, doi:10.1002/2015JD023777, 2015.

A. Nag, M. J. Murphy, W. Schulz, and K. L. Cummins, Lightning Locating Systems: Insights on characteristics and validation techniques, Earth and Space Science, doi: 10.1002/2014EA000051, 2015.

A. Nag and V.A. Rakov, A transmission-line-type model for lightning return strokes with branches, Electric Power Systems Research, Vol. 118, pp. 3-7, doi: 10.1016/j.epsr.2014.07.021, 2015.

A. Nag and M. J. Murphy, Overview of modern lightning locating systems, XIII International Symposium on Lightning Protection (SIPDA), Balneario Camboriu, Brazil, September, 2015.

A. Nag and V. A. Rakov, A unified engineering model of the first stroke in lightning, Ninth Asia-Pacific International Lightning Conference, paper 1236, Nagoya, Japan, June, 2015.

D. Zhang, K. L. Cummins, and A. Nag, Assessment of cloud lightning detection by the U.S. National Lightning Detection Network using video and Lightning Mapping Array observations, Seventh Conference on the Meteorological Applications of Lightning Data, paper 7.1, 95th American Meteorological Society Annual Meeting, Phoenix, Arizona, January, 2015.

M.J. Murphy and A. Nag, Cloud lightning performance and climatology of the U.S. based on the upgraded U.S. National Lightning Detection Network, Seventh Conference on the Meteorological Applications of Lightning Data, paper 8.4, 95th American Meteorological Society Annual Meeting, Phoenix, Arizona, January, 2015.

A. Nag and K. L. Cummins, Characteristics of cloud-to-ground lightning return strokes occurring over land and ocean, American Geophysical Union Fall Meeting, San Francisco, December, 2015.

A. Nag, K. L. Cummins, and J. Myers, Overview of lightning observations at wind farms in the central United States, Third International Conference on Energy and Meteorology, Boulder, Colorado, June, 2015.

A. Nag and R. L. Holle, Cloud and cloud-to-ground lightning activity associated with Hurricane Arthur, Seventh Conference on the Meteorological Applications of Lightning Data, abstract 10.3, 95th American Meteorological Society Annual Meeting, Phoenix, Arizona, January, 2015.

Shi, F., N. Y. Liu,and H. K. Rassoul, Dynamics of a relatively long positive streamer from an isolated hydrometeor, AGU Fall Meeting, San Francisco, CA, December 14-18,2015.

Boggs, L. D., N. Y. Liu, M. Splitt, S. Lazarus, S. A. Cummer, and H. K. Rassoul, An analysis of two thunderstorms producing five negative sprites on 12 September 2014, AGU Fall Meeting, San Francisco, CA, December 14-18,2015.

E. S. Cramer, J. R. Dwyer, N. Y. Liu,H. K. Rassoul, and M. Briggs, Relativistic runaway electron avalanches in the presence of an external magnetic field, AGU Fall Meeting, San Francisco, CA, December 14-18,2015.

Salem, M., N.Y. Liu, and H.K. Rassoul, Effects of thunderstorm electrostatic fields on the conductivity of the lower ionosphere, NSF CEDAR workshop, Seattle, WA, June 21-June 25, 2015.

2014

A. Nag and V. A. Rakov, Parameters of electric field waveforms produced by positive lightning return strokes, IEEE Transactions on EMC, Vol. 56 (4), pp. 932 – 939, doi: 10.1109/TEMC.2013.2293628, 2014.

S. Mallick, V.A. Rakov, T. Ngin, W.R. Gamerota, J.T. Pilkey, J.D. Hill, M.A. Uman, D.M. Jordan, A. Nag, and R.K. Said, Evaluation of the GLD360 performance characteristics using rocket-and-wire triggered lightning data, Geophysical Research Letters, Vol. 41 (10), pp. 3636–3642, doi: 10.1002/2014GL059920, 2014.

V.A. Rakov, S. Mallick, A. Nag, and V.B. Somu, Lightning Observatory in Gainesville (LOG), Florida: A review of recent results, Electric Power Systems Research, Vol. 113, pp. 95–103, 2014.

S. Mallick, V.A. Rakov, T. Ngin, W.R. Gamerota, J.T. Pilkey, J.D. Hill, M.A. Uman, D.M. Jordan, J.A. Cramer, and A. Nag, Performance characteristics of the NLDN for return strokes and pulses superimposed on steady currents, based on rocket-triggered lightning data acquired in Florida in 2004-2012, Journal of Geophysical Research, Vol. 119 (7), pp. 3825–3856, doi: 10.1002/2013JD021401, 2014.

Salem, M., N. Y. Liu,and H. K. Rassoul, Effects of small electrostatic fields on the ionospheric density profile, AGU Fall Meeting, San Francisco, CA, December 15-19,2014.

Salem,M.,N.Y.Liu,andH.K.Rassoul,Thedependenceofionosphericdensitiesonsmallelectrostatic fields in the mesosphere and lower ionosphere, NSF CEDAR workshop, Seattle, WA, June 22-June 28, 2014.

Dwyer, J. R., N. Y. Liu,and H. K. Rassoul, A fully 3-D, time-dependent and self-consistent model of relativistic feedback discharges, URSI National Radio Science Meeting, Boulder, CO, January 8-11, 2014.

2013

(Invited) Liu, N. Y., Long recovery of the lower ionosphere from the quasi-electrostatic effects of cloud-to-ground lightning, 2013 URSI National Radio Science Meeting, Boulder, CO, January 9-12, 2013.

Liu, N. Y., and J. R. Dwyer, A numerical study on TGFs and relativistic feedback discharges, 2013 URSI National Radio Science Meeting, Boulder, CO, January 9-12, 2013.

Dwyer, J. R. and N. Y. Liu, Relativistic feedback discharge theory, 2013 URSI National Radio Science Meeting, Boulder, CO, January 9-12, 2013.

Liu, N. Y., J. R. Dwyer, and H. K. Rassoul , Production of Ionospheric Perturbations by Cloud-to-Ground Lightning and the Recovery of the Lower Ionosphere, 2013 EGU General Assembly, Vienna, Austria, April 2013.

Kelley, N., D. Smith, J. R. Dwyer, B. Hazelton, B. Grefenstette, A. Lowell, M. Splitt, S. Lazarus, and H. K. Rassoul, Common Gamma-ray Glows above Thunderclouds, 2013 EGU General Assembly, Vienna, Austria, April 2013.

Dwyer, J. R., N. Y. Liu, and H. K. Rassoul, Modeling the radiation doses from terrestrial gamma-ray flashes, 2013 EGU General Assembly, Vienna, Austria, April 2013.

Liu, N. Y., J. R Dwyer, and H. K. Rassoul, Characteristics of the Relativistic Feedback Discharge and the Energetic Radiation Produced, 2013 EGU General Assembly, Vienna, Austria, April 2013.

Liu, N. Y.,N. Spiva, J. R. Dwyer, H. K. Rassoul, D. Free, and S. A. Cummer, Observations of seven blue/gigantic jets above one storm over the Atlantic Ocean, AGU Fall Meeting, San Francisco, CA, December 9-13,2013.

Kosar, B., N. Y. Liu, and H. K. Rassoul, Luminosity characteristics of sprite streamers forming from large ionospheric disturbances at subbreakdown conditions, AGU Fall Meeting, San Francisco, CA, December 9-13,2013.

Sadighi, S., N. Y. Liu,J. R. Dwyer, and H. K. Rassoul, Theoretical study of streamer emission from thundercloud hydrometeors, AGU Fall Meeting, San Francisco, CA, December 9-13,2013.

Dwyer, J. R., N. Y. Liu,and H. K. Rassoul, A comprehensive model of dark lightning and terrestrial gamma-ray flashes, AGU Fall Meeting, San Francisco, CA, December 9-13,2013.

E. S. Cramer, J. R. Dwyer, S. Arabshahi, N. Y. Liu,I. Vodopiyanov, and H. K. Rassoul, A theoretical study of the runaway electron energy spectrum inside the high field regions of thunderclouds, AGU Fall Meeting, San Francisco, CA, December 9-13,2013.

Lucia, R., J. R. Dwyer, N. Y. Liu,and H. K. Rassoul, Relativistic feedback rates in the presence of the geomagnetic field, AGU Fall Meeting, San Francisco, CA, December 9-13,2013.

Liu, N. Y.,J. R. Dwyer, and H. K. Rassoul, Optical emissions produced by relativistic feedback discharges making terrestrial gamma-ray flashes, NSF CEDAR workshop, Boulder, CO, June 22-June 28,2013.

Sadighi, S., N. Y. Liu,J. R. Dwyer, and H. K. Rassoul, The effects of ambient density on streamer emission from hydrometeors in subbreakdown electric fields, NSF CEDAR workshop, Boulder, CO, June 22-June 28, 2013.

Kosar, B., N. Y. Liu, and H. K. Rassoul, Characteristics of optical emissions from streamer formation from ionospheric patches at subbreakdown conditions, NSF CEDAR workshop, Boulder, CO, June 22- June 28, 2013.

2012

Arabshahi, S., E. S. Cramer, J. R. Dwyer, J. E. Grove, C.l Gwon, J. D. Hill, D. M. Jordan, R. J. Lucia, H. K. Rassoul, and M. A. Uman, The Energy Spectrum of X-Rays from Rocket-triggered Lightning, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

D. M. Jordan, J. D. Hill, M. A. Uman, J. R. Dwyer, and H. K. Rassoul, Time-of-Arrival Measurements of X-ray Emission Associated with Dart-Stepped Leader Steps in Natural and Rocket-and-Wire Triggered Lightning, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

N. A. Kelley, D. M. Smith, J. R. Dwyer, B. J. Hazelton, B. W. Grefenstette, A. Lowell, Michael E. Splitt, S. M. Lazarus, and H. K. Rassoul, ADELE's Common Gamma-Ray Glows, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

G. Bowers, D. M. Smith, J. R. Dwyer, S. A. Cummer, F. Martinez-Mckinney, N. A. Kelley, C. B. Harris, and P. Buzbee, ADELE sensitivity to high-energy radiation from transient luminous events during the Hurricane and Severe Storm Sentinels campaigns, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

Schaal, M. M., J. R. Dwyer, H. K. Rassoul, M. A. Uman, D. M. Jordan, and J. D. Hill, The Angular Distribution of Electron and X-ray Emission from Triggered Lightning Leader Steps Using the Thunderstorm Energetic Radiation Array (TERA), 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

Cramer, E. S., J. R. Dwyer, H. K. Rassoul, G. J. Fishman, N. P. Bhat, M. S. Briggs, V. L. Chaplin, V. Connaughton, and G. Fitzpatrick, Spectral and Temporal Analysis of Terrestrial Gamma-Ray Flashes, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

Dwyer, J. R. and S. A. Cummer, Modeling and observations of the radio frequency emissions from terrestrial gamma-ray flashes, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

Cooray, V., T. Marshall, G. Cooray, J Dwyer, and S. Arabshahi, Electric field of a relativistic electron avalanche, Lightning Protection (ICLP), 2012 International Conference on, 1-5, 2012.

Liu, N. Y., and J. R. Dwyer, Modeling gamma-radiation from thunderclouds and lightning, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

Kosar, B., N. Y. Liu, and H. K. Rassoul, The minimum density requirement for ionospheric ionization patches for sprite streamer formation at subbreakdown conditions, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

Sadighi, S., N. Y. Liu, J. R. Dwyer, and H. K. Rassoul, Modeling of streamer discharges from dielectric hydrometeors inside thunderclouds, 2012 AGU Fall Meeting, San Francisco, CA, December 3-7, 2012.

Liu, N. Y., Recovery of the lower ionosphere from modifications by negative halos, 2012 NSF CEDAR workshop, Santa Fe, NM, June 24-June 29, 2012.

Liu, N. Y., and J. R. Dwyer, A fixed grid approach to TGF modeling, 2012 NSF CEDAR workshop, Santa Fe, NM, June 24-June 29, 2012.

Sadighi, S., N. Y. Liu, J. R. Dwyer, and H. K. Rassoul, Streamer discharges from dielectric hydrometeors, 2012 NSF CEDAR workshop, Santa Fe, NM, June 24-June 29, 2012.

Kosar, B., N. Y. Liu, and H. K. Rassoul, Investigation of the density requirement for ionospheric patches for sprite streamer formation at sub-breakdown conditions, 2012 NSF CEDAR workshop, Santa Fe, NM, June 24-June 29, 2012.

Kosar, B., N. Y. Liu, and H. K. Rassoul, Investigation of luminosity and propagation characteristics of sprite streamers initiated from small ionospheric disturbances in lightning electric field below breakdown threshold field, 2012 URSI National Radio Science Meeting, Boulder, CO, January 4-7, 2012.

2011

Dwyer, J. R. et al., Understanding the source mechanisms of terrestrial gamma-ray flashes, , 2011 TGF workshop, University of Alabama in Huntsville, AL, July 13-14, 2011.

Arabshahi, S. et al., The role of the runaway breakdown – extensive air showers in thundercloud processes, 2011 TGF workshop, University of Alabama in Huntsville, AL, July 13-14, 2011.

Cramer, E. S. et al., Accurately Modeling Terrestrial Gamma-Ray Flashes Observed with GBM, 2011 TGF workshop, University of Alabama in Huntsville, AL, July 13-14, 2011.

Schaal, M. M. et al., Electron Luminosity Measurements from Natural and Rocket-and-Wire Triggered Lightning using the Thunderstorm Energetic Radiation Array (TERA), 2011 TGF workshop, University of Alabama in Huntsville, AL, July 13-14, 2011.

M. Splitt et al., Thunderstorm morphology of WWLLN located Terrestrial Gamma-Ray Flashes observed by FERMI-GBM, 2011 TGF workshop, University of Alabama in Huntsville, AL, July 13-14, 2011.

Dwyer, J R, Modeling Terrestrial Gamma-Ray Flashes, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

(Invited) Cummer, S A, G. Lu, M. S. Briggs, V. Connaughton, S. Xiong, G. J. Fishman, J. R. Dwyer, The lightning-TGF relationship on microsecond timescales, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

Mallick, S, V. A. Rakov, J. R. Dwyer, J. D. Hill, X-ray emissions associated with thunderstorms, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

Kelley, N, D. M. Smith, J. R. Dwyer, B. J. Hazelton, B. W. Grefenstette, A. Lowell, M. E. Splitt, S. M. Lazarus, H. K. Rassoul, Long duration gamma-ray glows observed from the tops of thunderstorms, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

Cooray, G K, G. V. Cooray, J. R. Dwyer, Some of the ball lightning observations could be phosphenes induced by energetic radiation from thunderstorms and lightning, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

Liu, N. Y., Multiple ion species fluid modeling of sprite halos and the role of electron detachment from O- in their dynamics, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

Sadighi, S., N. Y. Liu, J. R. Dwyer, and H. K. Rassoul, Streamer initiation from hydrometeors in weak thundercloud electric fields, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

Kosar, B., N. Y.Liu, and H. K. Rassoul, Sprite streamer formation in sub-breakdown conditions from an ionospheric disturbance, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

McHarg, M. G., J. Ahrns, H. C. Stenbaek-Nielsen, T. Kammae, R. K. Haaland, S. A. Cummer, J. Li, N. Y. Liu, P. Yukman, High time resolution luminosity profiles of Jellyfish (Super) Sprites, 2011 AGU Fall Meeting, San Francisco, CA, December 5-9, 2011.

Liu, N. Y., Multiple ion species fluid modeling of sprite halos, 2011 URSI General Assembly, Istanbul, Turkey, August 13-20, 2011.

Sadighi, S., N. Y. Liu, J. R. Dwyer, and H. K. Rassoul, Streamer emission from thundercloud hydrometeors, 2011 TGF workshop, University of Alabama in Huntsville, AL, July 13-14, 2011.

Sadighi, S., N. Y. Liu, J. R. Dwyer, and H. K. Rassoul, Streamer discharges from isolated hydrometeors in thunderclouds, 2011 NSF CEDAR workshop, Santa Fe, NM, June 26-July 1, 2011.

Kosar, B., N. Y. Liu, and H. K. Rassoul, Sprite streamer formation in under-voltage conditions, 2011 NSF CEDAR workshop, Santa Fe, NM, June 26-July 1, 2011.

(Invited) Liu, N. Y., Quantitative simulations of sprite streamer discharges, 2011 SIAM Conference on Applications of Dynamical Systems, Snowbird, Utah, May 22-26, 2011.

(Invited) Liu, N. Y., and D. D. Sentman, Ion chemistry and local conductivity change induced by sprite streamers in the lower ionosphere, 2011 URSI National Radio Science Meeting, Boulder, CO, January 5-8, 2011.

Cummer, S. A., G. Lu, J. Li, R. J. Blakeslee, D. M. Smith, J. R. Dwyer, M. S. Briggs, …., Detailed observations of lightning flashes and processes associated with terrestrial gamma ray flashes, General Assembly and Scientific Symposium, 2011 XXXth URSI, 1-1, 2011.

2010

Kosar, B., N. Y. Liu,and H. K. Rassoul, Investigation of the exponential growth rate of sprite streamer characteristics, AGU Fall Meeting, San Francisco, CA, December 13-17,2010.

Kosar, B., N. Y. Liu,and H. K. Rassoul, Effects of ambient field and altitude variation on exponential growth rate of a model positive sprite streamer, NSF CEDAR workshop, Boulder, CO, June 20-25, 2010.

Rassoul, H. K., N. Y. Liu,and J. R. Dwyer, Condition for positive corona inception from thundercloud hydrometeors, AGU Fall Meeting, San Francisco, CA, December 13-17,2010 Abstract

Constraints on the First Terrestrial Gamma-ray Flash Seen from an Aircraft Abstract

Continuous X-ray Emission from "Chaotic" Dart Leaders in Triggered Lightning Abstract

Design and Construction of an X-ray Lightning Camera Abstract

Rare TGFs and Common Glows: A Systematic Survey of Data from the First Flights of ADELE Abstract

Stepped Leaders Observed in Ground Operations of ADELE Abstract

X-ray Images of Rocket-Triggered Lightning (Invited) Abstract