University of New BrunswickGeodesy and Geomatics Engineering

GGE Home

Attila Komjathy, Adjunct Professor

NASA Jet Propulsion Laboratory,
California Institute of Technology
M/S 138-308C
4800 Oak Grove Drive
Pasadena, CA 91109
Phone: 818-393-6828, Fax: 818-393-5115

Dr. Komjathy is investigating ground and space-based GPS measurements to study the temporal and spatial variations of the global ionosphere at the NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California. He has over 20 years of experience in the developments of novel remote sensing technologies used by NASA, Air Force, and Navy. He primarily works with GPS ground-based, radio occultation measurements for ionospheric specifications and GPS reflections for wind speed, wind direction, soil moisture, and altimetry applications. Furthermore, he conducts research on technologies related to the FAA's Wide Area Augmentation System (WAAS) and Satellite-Based Augmentation Systems (SBAS). He serves as Principal Investigator on multiple grants for NASA to investigate natural hazards real-time detection using GNSS data.


Ph.D. in Geodesy and Geomatics Engineering, 1997, University of New Brunswick, Fredericton, N.B. Canada.

Dipl. Eng., 1989, University of Miskolc, Hungary

Professional Experience

2006 − Present , Principal Investigator, Senior Member, Research Scientist, Ionospheric and Atmospheric Remote Sensing Group of the Tracking Systems and Applications Section (335) of Jet Propulsion Laboratory, California Institute of Technology.

2001 − 2006, Member Technical Staff at JPL.

1997 – 2001, Post-doctoral Research Associate, Colorado Center for Astrodynamics Research (CCAR), Department of Aerospace Engineering Sciences, University of Colorado at Boulder, CO.

1991 – 1997, Research Assistant, Department of Geodesy and Geomatics Engineering, University of New Brunswick, Canada

Recent Recognitions

Selected Past Honors and Awards

Elected Member of ION National Council; Cited as “50+ Leaders to Watch” in GPS World, May 2008; ⎯ United States Patent, October 2007; ⎯ NASA Space Act Awards, May 2005, February 2006, Exceptional Space Act Award, Nov 2006; ⎯ NASA Group Achievement Awards; ⎯ Best Paper Awards at the Institute of Navigation (ION) GNSS 2010, 2004, 2003 and 2002 Meetings ⎯ Mariner Award 2010 ⎯ AGU Editor's Choice Award 2010.

1998, Awarded with the Canadian Governor General Gold Medal for academic excellence

Recent Media Highlights

NASA Visible Earth (2012). “Quake and Tsunami Makes Waves in the Atmosphere”

NASA JPL (2012) “Tsunami Makes Waves in More Than Just the Ocean”

Reuters (2012) “Fukushima quake, tsunami disturbed upper atmosphere: NASA”

Toronto Star (2012). “Japan earthquake and tsunami disturbed upper atmosphere: NASA”

Russian coverage (2012) “Команда Лаборатории NASA задействует GPS в системе раннего предупреждения о цунами.”

Hungarian coverage (2012) “GPS-szel előre jelezhető a cunami”

Selected Recent Refereed Papers

Komjathy, A. (2013). “The Effects of the Ionosphere on the Propagation of Electromagnetic Waves.” Encyclopedia of Remote Sensing, Ed: E.G. Njoku. Springer Verlag, in press.

Thomas, J. N., J. J. Love, A. Komjathy, O. P. Verkhoglyadova, M. Butala, and N. Rivera (2012). “On the reported ionospheric precursor of the 1999 Hector Mine, California earthquake.” Geophysical Research Letters. (39). L06302, doi:10.1029/2012GL051022.

Komjathy, A., D.A. Galvan, P. Stephens, M.D. Butala, V. Akopian, B.D. Wilson, O. Verkhoglyadova, A.J. Mannucci, and M. Hickey (2012). “Detecting Ionospheric TEC Perturbations Caused by Natural Hazards Using a Global Network of GPS Receivers: the Tohoku Case Study.” Earth, Planets and Space, Special Issue on “The 2011 Tohoku Earthquake” (in press).

Galvan, D. A., A. Komjathy, M. P. Hickey, P. Stephens, J. Snively, Y. Tony Song, M. D. Butala, and A. J. Mannucci (2012) “Ionospheric signatures of Tohoku-Oki tsunami of March 11, 2011: Model comparisons near the epicenter”, Radio Science, 47,RS4003, doi:10.1029/2012RS005023, In EOS Research Highlights.

Galvan, D. A., A. Komjathy, M. P. Hickey, and A. J. Mannucci (2011). “The 2009 Samoa and 2010 Chile tsunamis as observed in the ionosphere using GPS total electron content.” Journal of Geophysical Research (Space Physics). (116). A06,318, 10.1029/2010JA016204.

Stephens, P., A. Komjathy, B. Wilson, and A. Mannucci (2011). “New Leveling and Bias Estimation Algorithms for Processing COSMIC/FORMOSAT-3 Data for Slant Total Electron Content Measurements.” Radio Science. (46). doi:10.1029/2010RS004588

Shuanggen, J. and A. Komjathy (2010). “GNSS reflectometry and remote sensing: New objectives and results.” Advances in Space Research. (46) 2. pp. 111-117.

Komjathy, A., B.D. Wilson, and A.J. Mannucci (2010). “New Developments on Estimating Satellite Interfrequency Bias for SVN49.” Journal of GPS Solutions. DOI 10.1007/s10291-010-0185-5.

Komjathy, A., B. Wilson, X. Pi, V. Akopian, M. Dumett, B. Iijima, O. Verkhoglyadova, and A. J. Mannucci (2010). “JPL/USC GAIM: On the Impact of Using COSMIC And Ground-Based GPS Measurements To Estimate Ionospheric Parameters.” Journal of Geophysical Research. doi:10.1029/2009JA014420 (Editor's Choice Award).

Kuo-Hsin Tseng, C.K. Shum, Yuchan Yi, Chunli Dai, Hyongki Lee, D. Bilitza, A. Komjathy, C.Y. Kuo, Jinsong Ping, and M. Schmidt (2010). “Regional Validation of Jason-2 Dual-Frequency Ionosphere Delays.” Marine Geodesy. (33)S1, pp. 272-284.

Anghel, A., C. Carrano, A. Komjathy, A. Astilean, and T. Letia (2009). “Kalman filter-based algorithms for monitoring the ionosphere and plasmasphere with GPS in near-real time.” Journal of Atmospheric and Solar-Terrestrial Physics. 71(1). pp. 158-174.

Mannucci , A. J., B. T. Tsurutani, M. C. Kelley, B. A. Iijima, and A. Komjathy (2009). “Local time dependence of the prompt ionospheric response for the 7, 9, and 10 November 2004 superstorms.” Journal of Geophysical Research. (114). A10308, doi:10.1029/2009JA014043.

Coster, A. and A. Komjathy (2008). “Space Weather and Global Positioning System.”, Space Weather. (6). S06D04, doi:10.1029/2008SW000400. Also featured article on the cover page of Space Weather Quarterly in June 6, 2008 Printed Issue:

Hernandez-Pajares, M., J.M. Juan, J, Sanz, R. Orus, A. Garcia-Rigo, J. Feltens, A. Komjathy, S.C. Schaer, and A. Krankowski (2008). “The IGS VTEC Maps: A Reliable Source of Ionospheric Information Since 1998.” Journal of Geodesy. Ref.: Ms. No. JOGE-D-08-00024R1.

Occhipinti, G., A. Komjathy, and P. Lognonne (2008). “Tsunami Detection by GPS: How Ionospheric Observations Might Improve the Global Warning System.” Innovation Column, GPS World. February 2008.

Mannucci, A. J., B. T. Tsurutani, M. A. Abdu, W. D. Gonzalez, A. Komjathy, E. Echer, B. A. Iijima, G. Crowley, and D. Anderson (2008). “Superposed epoch analysis of the dayside ionospheric response to four intense geomagnetic storms.” Journal of Geophysical Research. (113). A00A02, doi:10.1029/2007JA012732.

Yizengaw, E., M.B Moldwin, D. Galvan, B.A. Iijima, A. Komjathy, and A.J. Mannucci (2008). “Global plasmaspheric TEC and its relative contribution to GPS TEC.” Journal of Atmospheric and Solar-Terrestrial Physics. (70)11. pp.1541-1548.

Anghel, A., A. Astilean, T. Letia, and A. Komjathy (2008). “Near real-time monitoring of the ionosphere using dual frequency GPS data in a Kalman filter approach.” Journal of Control Engineering and Applied Informatics. (10)2. pp. 33-38.

Xiaoqing Pi, A. J. Mannucci, B. A. Iijima, B. D. Wilson, A. Komjathy, T. F. Runge, and V. Akopian (2008). “Assimilative Modeling of Ionospheric Disturbances with COSMIC and Ground-Based GPS Measurements.” Special Issue of TAO Journal on FORMOSAT-3/COSMIC Mission Early Results.