Longitudinal Dependence of Whistler Mode Electromagnetic Waves in the Earth's Inner Magnetosphere

J Záhlava; F Němec; O Santolík; I Kolmašova; G. B Hospodarsky; M Parrot; W. S Kurth; J Bortnik; C Kletzing

doi:10.1029/2018JA025284

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Longitudinal Dependence of Whistler Mode Electromagnetic Waves in the Earth's Inner Magnetosphere

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Longitudinal Dependence of Whistler Mode Electromagnetic Waves in the Earth's Inner Magnetosphere

J Záhlava, F Němec, O Santolík, I Kolmašova, G. B Hospodarsky, M Parrot, W. S Kurth, J Bortnik and C Kletzing

Journal of geophysical research. Space physics, Vol.123(8), pp.6562-6575

08/2018

DOI: 10.1029/2018JA025284

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Abstract

We use the measurements performed by the DEMETER (2004–010) and the Van Allen Probes (2012–016, still operating) spacecraft to investigate the longitudinal dependence of the intensity of whistler mode waves in the Earth's inner magnetosphere. We show that a significant longitudinal dependence is observed inside the plasmasphere on the nightside, primarily in the frequency range 400 Hz to 2 kHz. On the other hand, almost no longitudinal dependence is observed on the dayside. The obtained results are compared to the lightning occurrence rate provided by the Optical Transient Detector/Lightning Imaging Sensor mission normalized by a factor accounting for the ionospheric attenuation. The agreement between the two dependencies indicates that lightning‐generated electromagnetic waves may be responsible for of the observed effect, thus substantially affecting the overall wave intensity in the given frequency range. Finally, we show that the longitudinal dependence is most pronounced for waves with oblique wave of normal angles. Key Points Longitudinal dependence of whistler mode waves in the inner magnetosphere is investigated Significant longitudinal dependence at frequencies between about 0.4 and 2 kHz is found inside the plasmasphere The dependence is primarily observed on the nightside and is likely related to lightning activity

DEMETER

Van Allen Probes

whistler waves

Details

Title: Subtitle: Longitudinal Dependence of Whistler Mode Electromagnetic Waves in the Earth's Inner Magnetosphere
Creators: J Záhlava - Charles University
F Němec - Charles University
O Santolík - Charles University
I Kolmašova - Charles University
G. B Hospodarsky - University of Iowa
M Parrot - French National Centre for Scientific Research
W. S Kurth - University of Iowa
J Bortnik - University of California, Los Angeles
C Kletzing - University of Iowa
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.123(8), pp.6562-6575
DOI: 10.1029/2018JA025284
ISSN: 2169-9380
eISSN: 2169-9402
Number of pages: 14
Grant note: GACR (18-00844S) MSMT (LTAUSA 17070) Praemium Academiae NASA (921647; NAS5-01072) GAUK (300216) GACR (17-07027S)
Language: English
Date published: 08/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984199724702771

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