Conjugate ground-satellite ELF/VLF emissions observed with strong magnetospheric compression

0477989 - ÚFA 2018 BE eng C - Conference Paper (international conference)
Martinez-Calderon, C. - Shiokawa, K. - Keika, K. - Kurita, S. - Ozaki, M. - Schofield, I. - Connors, M. - Kletzing, C. - Santolík, Ondřej - Kurth, W. S.
Conjugate ground-satellite ELF/VLF emissions observed with strong magnetospheric compression.
Papers from URSI: XXXIInd General Assembly and Scientific Symposium (URSI GASS). Ghent: URSI, 2017, č. článku H41-5..
[URSI General Assembly and Scientific Symposium (URSI GASS) 2017 /32./. Montreal (CA), 19.08.2017-26.08.2017]
R&D Projects: GA ČR(CZ) GA14-31899S
Institutional support: RVO:68378289
Keywords : ELF waves * VLF waves * Whistler mode waves * maagnetosphere
Subject RIV: BL - Plasma and Gas Discharge Physics

We report the first simultaneous ground and satellite conjugate observations of ELF/VLF waves associated with magnetospheric compression. On 23 December 2014, a receiver at subauroral latitudes at Athabasca (ATH), Canada (54.7N, 246.7E, L=4.3) observed an ELF/VLF wave burst centered at ~2.5 kHz. This emission showed discrete elements and lasted ~3 minutes starting at 11:17 UT (~2.4 MLT). RBSP-B, located nearly conjugate to ATH in the post-midnight sector (~3 3 MLT) observed a similar emission. This wave burst was observed a few minutes after an intense sudden impulse (SYM-H amplitude ~53 nT) caused by the enhancement of solar wind speed (~330 to ~420 km/s) and dynamic pressure (~2 to 6 nPa) during northward IMF. At 11:16 UT, RBSP-B also observed a separate hiss emission below 1.5 kHz that was not observed at ATH. We investigate the possible generation mechanisms of these waves and suggest that they differ for the hiss and discrete emissions and that their propagation to the ground is also different.
Permanent Link: http://hdl.handle.net/11104/0274219