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Communication Dans Un Congrès Année : 2019

EFD experiment onboard CSES satellite: Characterization of hiss and chorus whistler emissions during geomagnetic activity

Résumé

We study the geomagnetic activity effects on whistler emissions recorded by the Electric Field Detector (EFD) experiment onboard the China Seismo-Electromagnetic Satellite (CSES). This mission is devoted to investigate the ionospheric disturbances linked to the seismic activity. The satellite has a circular sun-synchronous orbit with a descending node at 14 LT and an altitude of 507 km [1]. Four probes are used to measure the electric field recorded by EDF instrument covering a frequency range from DC up to 3.5 MHz [2]. We consider in this analysis geomagnetic events which occurred in the year 2018 after the launch of the CSES satellite, i.e. on 02nd February 2018. The Kp-index leads us to estimate the variation of the geomagnetic activity which is found to have sudden enhancements on the following days: 21st April, 05th May, 26th Aug. and 10th Sept. We show in this analysis that the whistler emissions, i.e. hiss and chorus occurring in the frequency bandwidth 1 kHz to 20 kHz, are influenced by the Earth's magnetic activity. Hence whistler spectral shapes are globally found to develop towards higher frequencies. Two aspects are discussed: (a) the way to characterize an ionospheric disturbance index taking into consideration the CSES geographical configuration orbit and (b) the comparison of the electric field power levels as derived from EFD/CSES instrument and from ICE/DEMETER experiment [3].
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Dates et versions

insu-04469859 , version 1 (21-02-2024)

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Citer

Mohammed Y. Boudjada, Jianping Huang, Werner Magnes, Hans Ulrich Eichelberger, Sami Sawas, et al.. EFD experiment onboard CSES satellite: Characterization of hiss and chorus whistler emissions during geomagnetic activity. 21st EGU General Assembly, EGU2019, Apr 2019, Vienna, Austria. pp.id.7673. ⟨insu-04469859⟩
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