Properties of AKR‐Like Emissions Recorded by the Low Altitude Satellite DEMETER During 6.5 Years - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research Space Physics Year : 2022

Properties of AKR‐Like Emissions Recorded by the Low Altitude Satellite DEMETER During 6.5 Years

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Abstract

Auroral kilometric radiation (AKR) was first observed by ELECTRON 2 satellite in 1965 (Benediktov et al., 1965, 1966), and a comprehensive study of these emissions has been done by Gurnett (1974). They are generated at frequencies between 50 and 500 kHz during substorms on the field lines of discrete auroras above the auroral oval mainly during nighttime (22 hr in magnetic local time [MLT]). On average they are located at 70° of invariant latitude, and 1.5-3 R E of altitude (Gurnett, 1974; Kurth et al., 1975). The generation mechanism of the AKR is related to the electron Cyclotron Maser Instability (CMI) at frequencies close to the electron cyclotron frequency (Alexander & Kaiser, 1976; Wu & Lee, 1979; see also the review by Louarn [2006]). AKR is escaping from the Earth and their frequencies being well below the cutoff frequencies of the ionosphere (on average 10 MHz during daytime and 3 MHz during night time), this emission should not be observable at low altitudes. However, low-altitude satellites have observed Medium Frequency (MF, 300 kHz-3 MHz) waves in the same frequency range (Benson & Wong, 1987; Oya et al., 1985), and similar waves have been even registered by ground-based receivers (
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insu-03697281 , version 1 (16-06-2022)

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M. Parrot, F. Němec, O. Santolík. Properties of AKR‐Like Emissions Recorded by the Low Altitude Satellite DEMETER During 6.5 Years. Journal of Geophysical Research Space Physics, 2022, 127 (6), ⟨10.1029/2022JA030495⟩. ⟨insu-03697281⟩
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