Staff – Institute of Atmospheric Physics CAS

Ing. Jaroslav Chum, Ph.D.

Department:	Department of Ionosphere and Aeronomy
Position:	Deputy head of the Department
Position:	Senior Research Scientist
E-mail:
Phone:	+420 267 103 056
Room:	G317

Education:

Dipl. Ing. in Technical Cybernetics at Faculty of Electrical Engineering of the Czech Technical University, Prague in 1989.
Ph.D. in Plasma Physics at Czech Technical University - Faculty of Electrical Engineering, Department of Physics, Prague in 2004.

Employment and academic experience:

Research Engineer at the Institute of Geophysics from 1991 to 1994
Research Engineer at the Institute of Atmospheric Physics (IAP) from 1994 to 2000
Research Scientist at IAP from 2001 to 2013
Senior Research Scientist at IAP from 2013 to present.

Professional interest:

In the beginning of his carrier, J. Chum was involved in designing electronic subsystems for Czech satellites Magion-4 and Magion-5, digital sun sensor for several satellites and ground based measurements carried out at IAP, e.g., Continuous Doppler sounding of the ionosphere.

Since 2001, J. Chum has been involved in Space plasma physics investigations with a focus on wave propagation in the Earth's magnetosphere and ionosphere. The scientific activity dominates in recent years. Initially, J. Chum investigated propagation and properties of whistler waves and chorus emissions in the ionosphere and magnetosphere. Recently, he has mainly focused on propagation of internal gravity waves and infrasound in the upper atmosphere and ionosphere using the multi-point Continuous Doppler sounding, and on coupling of the ionosphere and upper atmosphere from below and from above. He is also interested in atmospheric electricity and cosmic rays.

Other info:

Member of the Board at the IAP, 2012-present
Member of the council for Science popularization at the Academy of Sciences of the Czech Republic
Reviewer for JGR-Space physics, J. Atmos. Sol. Terr. Phys., Advances in Space Res., Surveys in Geophysics, Geophysical Research Letters, Annales Geophysicae, Remote sensing, Radio Science, sensors, Earth and Space Science and for several Ph.D. and Master theses.
Associated editor of Frontiers in Astronomy and Space Sciences

J. Chum is author or co-author of about 80 articles in international refereed journals.

Projects:

CONICET-22-02 - AV ČR - Argentina project , Multi-instrument investigation of ionospheric perturbations, 2022-2024, investigator (IAP): Chum Jaroslav
SAV-21-01, Bilaterální spolupráce, Institute of Experimental Physics, SAS , Atmospheric electric field and dynamics of charged particles and secondary cosmic rays in high mountains, 2021-2022, investigator (IAP): Chum Jaroslav
ESA 4000126708/19/NL/IA , ILGEW - Investigating Lightning Generated ELF Whistlers to Improve Ionospheric Models, 2019-2020, investigator (IAP): Truhlík Vladimír, team: Obrazová, D.; Chum, J.
GA ČR GA18-01969S , Atmospheric waves: dynamics and vertical coupling, 2018-2021, investigator (IAP): Chum Jaroslav
SAV-18-04, Bilaterální spolupráce, Institute of Experimental Physics, SAS , Atmospheric electricity and secondary cosmic radiation, 2018-2021, investigator (IAP): Chum Jaroslav
GC15-07281J , Phenomena coupling the neutral and ionized atmosphere, 2015–2017, investigator (IAP): Chum Jaroslav
GA ČR. GA205/09/1253 , Elektromagnetické jevy spojující troposféru, mezosféru, ionosféru a magnetosféru, 2009-2013, investigator (IAP): Chum Jaroslav

Publications:

Chum, J., Šindelářová, T., Koucká Knížová, P., Podolská, K., Rusz, J., Baše, J., Nakata, H., (...), Laštovička, J., Obrazová, D. Kouba, D., Urbář, J., Truhlík, V., 2023: Atmospheric and ionospheric waves induced by the Hunga eruption on 15 January 2022. Doppler sounding and infrasound, Geophysical Journal International, 233, 2, 1429-1443
Kikuchi, T., Araki, T., Hashimoto, K.K., (...), Chum, Jaroslav, Hosokawa, K., Tomizawa, I., Tanaka, Y., Kadokura, A., 2022: Instantaneous Achievement of the Hall and Pedersen–Cowling Current Circuits in Northern and Southern Hemispheres During the Geomagnetic Sudden Commencement on 12 May 2021, Frontiers in Astronomy and Space Sciences, 9, 879314
Šlegl, J., Langer, R., Brunclík, T., Mašek, P., Strhárský, I., Ambrožová, I., Chum, Jaroslav, Ploc, O., 2022: Spectrometry of high-energy photons on high mountain observaroty Lomnický štít during thunderstorms, Radiation Protesction Dosimetry, 198, 9-11, 623-627
Bondár, I., Šindelářová, T., Ghica, D., Mitterbauer, U., Liashchuk, A., Baše, J., Chum, J., Czanik, C., Ionescu, C., Neagoe, C., Pasztor, M., Le Pichon, A., 2022: Central and Eastern European Infrasound Network: contribution to infrasound monitoring, Geophysical Journal International, 230, 1, 565-579
Fagre, M., Zossi, B.S., Chum, Jaroslav, Yiğ,it, E., Elias, A. G., 2021: Comparative Study of Equatorial and High-Latitude Over-The-Horizon Radar Parameters Using Ray-Tracing Simulations, IEEE Geoscience and Remote Sensing Letters, 18, 8976077
Kikuchi, T., Chum, Jaroslav, Tomizawa, I., Hashimoto, K.K., Hosokawa, K., Ebihara, Y., Hozumi, K., Supnithi, P. , 2021: Penetration of the electric fields of the geomagnetic sudden commencement over the globe as observed with the HF Doppler sounders and magnetometers, Earth, Planets and Space, 73, 10
Chilingarian, A., Karapetyan, T., Zazyan, M., Hovsepyan, G., Sargysan, B., Nikolova, N., Angelov, H., Chum, Jaroslav, Langer, R., 2021: Maximum strength of the atmospheric electric field, Physical Review D, 103, 4, 043021
Chum, Jaroslav, Podolská, Kateřina, Rusz, Jan, Baše, Jiří, Tedoradze, Nikolai, 2021: Statistical investigation of gravity wave characteristics in the ionosphere, Earth, Planets and Space, 73, 60
Rusz, Jan, Chum, Jaroslav, Baše, Jiří, 2021: Locating Thunder Source Using a Large-Aperture Micro-Barometer Array, Frontiers in Earth Science, 9, 614820
Podolská, K., Koucká Knížová, P., Chum, J., Kozubek, M., Burešová, D., 2021: Analysis of Relationship Between Ionospheric and Solar Parameters Using Graphical Models, Journal of Geophysical Research: Space Physics, 126, e2020JA029063
Šindelářová, T., De Carlo, M., Czanik, C., Ghica, D., Kozubek, M., Podolská, K., Baše, J., Chum, J., Mitterbauer, U., 2021: Infrasound signature of the post-tropical storm Ophelia at the Central and Eastern European Infrasound Network, Journal of Atmospheric and Solar-Terrestrial Physics, 217, 105603

Koucká Knížová, P., Laštovička, J., Kouba, D., Mošna, Z., Podolská, K., Potužníková, K., Šindelářová, T., Chum, J., Rusz, J., 2021: Ionosphere Influenced From Lower-Lying Atmospheric Regions, Frontiers in Astronomy and Space Sciences, 8, 651445
Chum, Jaroslav, Kollárik, M., Kolmašová, Ivana, Langer, R., Rusz, Jan, Saxonbergová, Dana, Strhárský, I., 2021: Influence of Solar Wind on Secondary Cosmic Rays and Atmospheric Electricity, Frontiers in Earth Science, 9, 671801
Mošna, Zbyšek, Kouba, Daniel, Koucká Knížová, Petra, Burešová, Dalia, Chum, Jaroslav, Šindelářová, Tereza, Urbář, Jaroslav, Boška, Josef, Saxonbergová-Jankovičová, Dana, 2020: Ionospheric storm of September 2017 observed at ionospheric station Pruhonice, the Czech Republic, Advances in Space Research, 65, 1, 115-128
Chum, Jaroslav, Langer, R., Baše, Jiří, Kollárik, M., Strhárský, I., Diendorfer, G., Rusz, Jan, 2020: Significant enhancements of secondary cosmic rays and electric field at the high mountain peak of Lomnický Štít in High Tatras during thunderstorms, Earth, Planets and Space, 72
Fagre, M., Zossi, B.S., Chum, Jaroslav, Elias, A. G., 2020: Simulated high frequency ray paths considering traveling ionospheric disturbances, SN Applied Sciences, 2
Hashimoto, K.K., Kikuchi, T., Tomizawa, I., Hosokawa, K., Chum, J., Burešová, D., Nose, M., Koga, K., 2020: Penetration electric fields observed at middle and low latitudes during the 22 June 2015 geomagnetic storm, Earth, Planets and Space, 72, 71
Belehaki, A., Tsagouri, I., Altadill, D., Blanch, E., Borries, C., Burešová, Dalia, Chum, Jaroslav, Galkin, I., Juan, J.M., Segarra, A., Timote, C.C., Tziotziou, K., Verhulst, T.G.W., Watermann, J., 2020: An overview of methodologies for real-time detection, characterisation and tracking of traveling ionospheric disturbances developed in the TechTIDE project, Journal of Space Weather and Space Climate, 10, 42
Liu, J. Y., Yang, S.S., Rajesh, P.K., Sun, Y.Y., Chum, Jaroslav, Pan, C.J., Chu, Y.H., Chao, C.K., Chang, L.C. , 2019: Ionospheric Response to the 21 May 2012 Annular SolarEclipse Over Taiwan, Journal of Geophysical Research: Space Physics, 124, 5, 3623-3636
Liu, J-Y., Chen, Ch-Y., Sun, Y. Y., Lee, I-T., Chum, Jaroslav, 2019: Fluctuations on vertical profiles of the ionospheric electron density perturbed by the March 11, 2011 M9.0 Tohoku earthquake and tsunami, GPS Solutions, 23, 3, 76
Fagre, M., Zossi, B.S., Chum, Jaroslav, Yigit, E., Elias, A. G., 2019: Ionospheric high frequency wave propagation using different IRI hmF2 and foF2 models, Journal of Atmospheric and Solar-Terrestrial Physics, 196, 105141
Nicoll, K.A., Harrison, R.G., Barta, V., Bór, J., Brugge, R., Chillingarian, A., Chum, Jaroslav, Georgoulias, A.K., Guha, A., Kourtidis, K., Kubicki, M., Mareev, E., Matthews, J., Mkrtchyan, H., Odzimek, A., Raulin, J.-P., Robert, D., Silva, H.G., Tacza, J., Yair, Y., Yaniv, R., 2019: A global atmospheric electricity monitoring network for climate and geophysical research, Journal of Atmospheric and Solar-Terrestrial Physics, 184, 18-29
Mošna, Zbyšek; Boška, Josef; Koucká Knížová, Petra; Šindelářová, Tereza; Kouba, Daniel; Chum, Jaroslav; Rejfek, Luboš; Potužníková, Kateřina; Arikan, F.; Toker, C., 2018: Observation of the solar eclipse of 20 March 2015 at the Pruhonice station, Journal of Atmospheric and Solar-Terrestrial Physics, 171, 277-284
Blanc, E., Ceranna, L., Hauchecorne, A., Charlton-Perez, A., Marchetti, E., Evers, L.G., Kvaerna, T., Laštovička, Jan, Eliasson, L., Crosby, N. B., Blanc-Benon, P., Le Pichon, A., Brachet, N., Pilger, C., Keckhut, P., Assink, J.D., Smets, P. S. M., Lee, C. F., Kero, J., Šindelářová, Tereza, Kämpfer, N., Rüfenacht, R., Farges, T., Millet, C., Näsholm, S. P., Gibbons, S. J., Espy, P. J., Hibbins, R. E., Heinrich, P., Ripepe, M., Khaykin, S., Mze, N., Chum, Jaroslav, 2018: Toward an Improved Representation of Middle Atmospheric Dynamics Thanks to the ARISE Project, Surveys in Geophysics, 39, 2, 171-225
Chum, Jaroslav, Liu, J.-Y., Podolská, Kateřina, Šindelářová, Tereza, 2018: Infrasound in the ionosphere from earthquakes and typhoons, Journal of Atmospheric and Solar-Terrestrial Physics, 171, Special Issue, 72-82
Kouba, Daniel, Chum, Jaroslav, 2018: Ground-based measurements of ionospheric dynamics, Journal of Space Weather and Space Climate, 8, A29
Šindelářová, Tereza, Mošna, Zbyšek, Chum, Jaroslav, Kouba, Daniel, Baše, Jiří, Liu, J. Y., Katamzi-Joseph, Z., 2018: Solar eclipse effects in the ionosphere observed by continuous Doppler sounding, Advances in Space Research, 62, 4, 785-800
Chum, Jaroslav, Podolská, Kateřina, 2018: 3D analysis of GW propagation in the ionosphere, Geophysical Research Letters, 45, 21, 11562-11571
Chum, Jaroslav, Urbář, Jaroslav, Laštovička, Jan, Cabrera, M. A., Liu, J.-Y., Bonomi, F. A. M., Fagre, M., Fišer, Jiří, Mošna, Zbyšek, 2018: Continuous Doppler sounding of the ionosphere during solar flares, Earth, Planets and Space, 70 , 198
Barta, V.; Haldoupis, C.; Sátori, G.; Burešová, Dalia; Chum, Jaroslav; Pozoga, M.; Berényi, K. A.; Bór, J.; Popek, Martin; Kis, Á.; Bencze, P., 2017: Searching for effects caused by thunderstorms in midlatitude sporadic E layers, Journal of Atmospheric and Solar-Terrestrial Physics , 161, August, 150-159
Laštovička, Jan; Chum, Jaroslav, 2017: A review of results of the international ionospheric Doppler sounder network, Advances in Space Research, 44, 16, 8186-8172
Kudela, Karel; Chum, Jaroslav; Kollárik, M.; Langer, R.; Strhárský, I.; Baše, Jiří, 2017: Correlations Between Secondary Cosmic Ray Ratesand Strong Electric Fields at Lomnický štít, Journal of Geophysical Research: Atmospheres , 122, 20, 10,700–10,710
Fišer, Jiří, Chum, Jaroslav, Liu, J. Y., 2017: Medium-scale traveling ionospheric disturbances over Taiwan observed with HF Doppler sounding, Earth Planets and Space, 69, 1, 131
Chum, Jaroslav ; Liu, J.-Y. ; Laštovička, Jan ; Fišer, Jiří ; Mošna, Zbyšek ; Baše, Jiří ; Sun, Y.-Y., 2016: Ionospheric signatures of the April 25, 2015 Nepal earthquake and the relative role of compression and advection for Doppler sounding of infrasound in the ionosphere, Earth, Planets and Space, 68, 24
Chum, Jaroslav ; Liu, J.-Y. ; Chen, S.-P. ; Cabrera, M. A. ; Laštovička, Jan ; Baše, Jiří ; Burešová, Dalia ; Fišer, Jiří ; Hruška, František ; Ezquer, R., 2016: Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data, Earth, Planets and Space, 68, 56
Liu, J. Y. ; Chen, C. H. ; Sun, Y. Y. ; Chen, C. H. ; Tsai, H. F. ; Yen, H. Y. ; Chum, Jaroslav ; Laštovička, Jan ; Yang, Q. S. ; Chen, S. W. ; Wen, S., 2016: The vertical propagation of disturbances triggered by seismic waves of the 11 March 2011 M9.0 Tohoku earthquake over Taiwan, Geophysical Research Letters, 43, 4 , 1759-1765
Šindelářová, Tereza; Kozubek, Michal; Chum, Jaroslav; Potužníková, Kateřina, 2016: Seasonal and diurnal variability of pressure fluctuation in the infrasound frequency range observed in the Czech microbarograph network, Studia geophysica et geodaetica, 60, 4, 747-762
Chum, Jaroslav; Cabrera, M. A.; Mošna, Zbyšek; Fagre, M.; Baše, Jiří; Fišer, Jiří, 2016: Nonlinear acoustic waves in the viscous thermosphere and ionosphere above earthquake, Journal of Geophysical Research: Space Physics, 121, 12, 126–137
Krasnov, V. M. ; Drobzheva, Ya. V. ; Chum, Jaroslav, 2015: Far-field coseismic ionospheric disturbances of Tohoku earthquake, Journal of Atmospheric and Solar-Terrestrial Physics, 135, December, 12–21
Šindelářová, Tereza ; Chum, Jaroslav ; Skripniková, Kateřina ; Baše, Jiří, 2015: Atmospheric infrasound observed during intense convective storms on 9-10 July 2011, Journal of Atmospheric and Solar-Terrestrial Physics, -, 122, 66-74
Chum, Jaroslav ; Bonomi, F. A. M. ; Fišer, Jiří ; Cabrera, M. A. ; Ezquer, R. G. ; Burešová, Dalia ; Laštovička, Jan ; Baše, Jiří ; Hruška, František ; Molina, M. G. ; Ise, J. E. ; Cangemi, J. I. ; Šindelářová, Tereza, 2014: Propagation of gravity waves and spread F in the low-latitude ionosphere over Tucumán, Argentina, by continuous Doppler sounding: First results, Journal of Geophysical Research: Space Physics, 119, 8, 6954-6965
Fišák, Jaroslav ; Chum, Jaroslav ; Vojta, Jaroslav ; Bartůňková, Kristýna, 2013: Automatic Monitoring of the Amount of Deposited Precipitation, Journal of Hydrometeorology, 14, 2, 670-676
Habarulema, J. B. ; McKinnell, L.- A. ; Burešová, Dalia ; Zhang, Y. ; Seemala, G. ; Ngwira, Ch. ; Chum, Jaroslav ; Opperman, B., 2013: A comparative study of TEC response for the African equatorial and mid-latitudes during storm conditions, Journal of Atmospheric and Solar-Terrestrial Physics, 102, 105-114
Chum, Jaroslav ; Diendorfer, G. ; Šindelářová, Tereza ; Baše, Jiří ; Hruška, František, 2013: Infrasound pulses from lightning and electrostatic ﬁeld changes: Observation and discussion, Journal of Geophysical Research: Atmospheres, 118, 19, 50805/1-50805/12
Chum, Jaroslav ; Athieno, R. ; Baše, Jiří ; Burešová, Dalia ; Hruška, František ; Laštovička, Jan ; McKinnell, L.- A. ; Šindelářová, Tereza, 2012: Statistical investigation of horizontal propagation of gravity waves in the ionosphere over Europe and South Africa, Journal of Geophysical Research, 117, - , A03312/1-A03312/13
Šindelářová, Tereza ; Mošna, Zbyšek ; Burešová, Dalia ; Chum, Jaroslav ; McKinnell, L.- A. ; Athieno, R., 2012: Observations of wave activity in the ionosphere over South Africa in geomagnetically quiet and disturbed periods, Advances in Space Research, 50, 2, 182-195
Chum, Jaroslav ; Hruška, František ; Zedník, Jan ; Laštovička, Jan, 2012: Ionospheric disturbances (infrasound waves) over the Czech Republic excited by the 2011 Tohoku earthquake, Journal of Geophysical Research, 117, - , A08319/1
Shklyar, D. R. ; Storey, L. R. O. ; Chum, J. ; Jiříček, F. ; Němec, F. ; Parrot, M. ; Santolík, O. ; Titova, E. E., 2012: Spectral features of lightning-induced ion cyclotron waves at low latitudes: DEMETER observations and simulation, Spectral features of lightning-induced ion cyclotron waves at low latitudes: DEMETER observations and simulation, 117, -, A12206/1-A12206/16
Krasnov, V. M. ; Drobzheva, Ya. V. ; Chum, Jaroslav, 2011: Infrasonic waves in the ionosphere generated by a weak earthquake, Journal of Atmospheric and Solar-Terrestrial Physics, 73, 13, 1930-1939
Fišer, Jiří ; Chum, Jaroslav ; Diendorfer, G. ; Parrot, M. ; Santolík, Ondřej, 2010: Whistler intensities above thunderstorms, Annales Geophysicae, 28, 1, 37-46
Chum, Jaroslav ; Šindelářová, Tereza ; Laštovička, Jan ; Hruška, František ; Burešová, Dalia ; Baše, Jiří, 2010: Horizontal velocities and propagation directions of gravity waves in the ionosphere over the Czech Republic, Journal of Geophysical Research, 115, A11322/1-A11322/13
Laštovička, Jan ; Baše, Jiří ; Hruška, František ; Chum, Jaroslav ; Šindelářová, Tereza ; Horálek, Josef ; Zedník, Jan ; Krasnov, V., 2010: Simultaneous infrasonic, seismic, magnetic and ionospheric observations in an earthquake epicentre, Journal of Atmospheric and Solar-Terrestrial Physics, 72, 16, 1231-1240
Shklyar, D. R. ; Parrot, M. ; Chum, Jaroslav ; Santolík, Ondřej ; Titova, E. E., 2010: On the origin of lower- and upper-frequency cutoffs on wedge-like spectrograms observed by DEMETER in the midlatitude ionosphere, Journal of Geophysical Research, 115, A05203/1-A05203/12
Breneman, A. W. ; Kletzing, C. A. ; Pickett, J. ; Chum, Jaroslav ; Santolík, Ondřej, 2009: Statistics of multispacecraft observations of chorus dispersion and source location, Journal of Geophysical Research, 114, A06202/1-A06202/12
Chum, Jaroslav ; Santolík, Ondřej ; Parrot, M., 2009: Analysis of subprotonospheric whistlers observed by DEMETER: A case study, Journal of Geophysical Research, 114, A02, A02307/1-A02307/17
Santolík, Ondřej ; Chum, Jaroslav, 2009: The origin of plasmaspheric hiss, Science, 324, 5928, 729-730
Chum, Jaroslav ; Hruška, František ; Burešová, Dalia ; Šindelářová, Tereza ; Hejda, Pavel ; Bochníček, Josef, 2009: Ionospheric oscillations caused by geomagnetic Pi2 pulsations and their observations by multipoint continuous Doppler sounding; first results, Advances in Space Research, 44, 6, 667-676
Chum, Jaroslav ; Santolík, Ondřej ; Gurnett, D. A. ; Pickett, J. S., 2009: Oblique lower band chorus waves: Time shifts between discrete elements observed by the Cluster spacecraft, Journal of Geophysical Research, 114, A00F02/1-A00F02/13
Santolík, Ondřej ; Gurnett, D. A. ; Pickett, J. S. ; Chum, Jaroslav ; Cornilleau-Wehrlin, N., 2009: Oblique propagation of whistler mode waves in the chorus source region, Journal of Geophysical Research, 114, A00F03/1-A00F03/12
Santolík, O. ; Parrot, M. ; Inan, U. S. ; Burešová, Dalia ; Gurnett, D. A. ; Chum, Jaroslav, 2009: Propagation of unducted whistlers from their source lightning: a case study, Journal of Geophysical Research, 114, A03212/1-A03212/11
Šindelářová, Tereza ; Burešová, Dalia ; Chum, Jaroslav ; Hruška, František, 2009: Doppler observations of infrasonic waves of meteorological origin at ionospheric heights, Advances in Space Research, 43, 11
Šindelářová, Tereza ; Burešová, Dalia ; Chum, Jaroslav, 2009: Observations of acoustic-gravity waves in the ionosphere generated by severe tropospheric weather, Studia geophysica et geodaetica, 53, 3, 403-418
Chum, Jaroslav ; Laštovička, Jan ; Šindelářová, Tereza ; Burešová, Dalia ; Hruška, František, 2008: Peculiar transient phenomena observed by HF Doppler sounding on infrasound time scales, Journal of Atmospheric and Solar-Terrestrial Physics, 70, 6, 866-878
Jakowski, N. ; Stankov, S. M. ; Wilken, V. ; Borries, C. ; Altadill, D. ; Chum, Jaroslav ; Burešová, Dalia ; Boška, Josef ; Šauli, Petra ; Hruška, František ; Cander, Lj. R., 2008: Ionospheric behaviour over Europe during the solar eclipse of 3 October 2005, Journal of Atmospheric and Solar-Terrestrial Physics, 70, 6, 836-853
Santolík, Ondřej ; Parrot, M. ; Chum, Jaroslav, 2008: Propagation Spectrograms of Whistler-Mode Radiation from Lightning, IEEE Transactions on Plasma Science, 36, 4, 1166-1167
Breneman, A. ; Kletzing, C. A. ; Chum, Jaroslav ; Santolík, Ondřej ; Gurnett, D. ; Pickett, J, 2007: Multispacecraft observations of chorus dispersion and source location, Journal of Geophysical Research, 112, A5, A05221/1-A05221/8
Burešová, Dalia ; Krasnov, Valerij Michailovič ; Drobzheva, Yana Viktorovna ; Laštovička, Jan ; Chum, Jaroslav ; Hruška, František, 2007: Assessing the quality of ionogram interpretation using the HF Doppler technique, Annales Geophysicae, 25, 4
Chum, Jaroslav ; Santolík, Ondřej ; Breneman, A. W. ; Kletzing, C. A. ; Gurnett, D. A. ; Pickett, J. S., 2007: Chorus source properties that produce time shifts and frequency range differences observed on different Cluster spacecraft, Journal of Geophysical Research, 112, A6, A06206/1-A06206/10
Santolík, Ondřej ; Chum, Jaroslav ; Parrot, M. ; Gurnett, D. A. ; Pickett, J. S. ; Cornilleau-Wehrlin, N., 2006: Propagation of whistler mode chorus to low altitudes: Spacecraft observations of structured ELF hiss, Journal of Geophysical Research, 111, A10, A10208/1-A10208/13
Chum, Jaroslav ; Jiříček, František ; Santolík, Ondřej ; Parrot, M. ; Diendorfer, G. ; Fišer, Jiří, 2006: Assigning the causative lightning to the whistlers observed on satellites, Annales Geophysicae, 24, 11, 2921-2929
Chum, Jaroslav ; Jiříček, František ; Šmilauer, Jan, 2005: Nonducted propagation of chorus emissions and their observation, Planetary and Space Science, 53, 1-3, 307-315
Chum, Jaroslav ; Santolík, Ondřej, 2005: Propagation of whistler-mode chorus to low altitudes: divergent ray trajectories and ground accessibility, Annales Geophysicae, 110, -, D10107/1/-D10107/11
Tříska, Pavel ; Czapek, Alexandr ; Chum, Jaroslav ; Hruška, František ; Šimůnek, Jiří ; Šmilauer, Jan ; Truhlík, Vladimír ; Vojta, Jaroslav, 2005: Space weather effects on the MAGION-4 and MAGION-5 solar cells, Annales Geophysicae, 23, -, 3111-3113