Simultaneous observations of traveling convection vortices: Ionosphere-thermosphere coupling: M-I-T COUPLING OF TCV

Kim, Hyomin; Lessard, Marc R.; Jones, Sarah L.; Lynch, Kristina A.; Fernandes, Philip A.; Aruliah, Anasuya L.; Engebretson, Mark J.; Moen, Joran I.; Oksavik, Kjellmar; Yahnin, Alexander G.; Yeoman, Timothy K.

doi:10.1002/2017JA023904

Title: Simultaneous observations of traveling convection vortices: Ionosphere-thermosphere coupling: M-I-T COUPLING OF TCV

Journal Article · Sat Mar 11 00:00:00 EST 2017 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2017JA023904· OSTI ID:1438123

^[1]; Lessard, Marc R. ^[2]; Jones, Sarah L. ^[3]; Lynch, Kristina A. ^[4];

^[5]; Aruliah, Anasuya L. ^[6];

^[7]; Moen, Joran I. ^[8];

^[9]; Yahnin, Alexander G. ^[10];

^[11]

New Jersey Inst. of Technology, Newark, NJ (United States)
Univ. of New Hampshire, Durham, NH (United States)
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Dartmouth College, Hanover, NH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. College London (United Kingdom)
Augsburg College, Minneapolis, MN (United States)
Univ. of Oslo (Norway); Univ. Centre in Svalbard, Longyearbyen (Norway)
Univ. Centre in Svalbard, Longyearbyen (Norway); Univ. of Bergen (Norway)
Polar Geophysical Inst., Apatity (Russian Federation)
Univ. of Leicester (United Kingdom)

We present simultaneous observations of magnetosphere-ionosphere-thermosphere coupling over Svalbard during a traveling convection vortex (TCV) event. Various spaceborne and ground-based instruments made coordinated measurements, including magnetometers, particle detectors, an all-sky camera, European Incoherent Scatter (EISCAT) Svalbard Radar, Super Dual Auroral Radar Network (SuperDARN), and SCANning Doppler Imager (SCANDI). The instruments recorded TCVs associated with a sudden change in solar wind dynamic pressure. The data display typical features of TCVs including vortical ionospheric convection patterns seen by the ground magnetometers and SuperDARN radars and auroral precipitation near the cusp observed by the all-sky camera. Simultaneously, electron and ion temperature enhancements with corresponding density increase from soft precipitation are also observed by the EISCAT Svalbard Radar. The ground magnetometers also detected electromagnetic ion cyclotron waves at the approximate time of the TCV arrival. This implies that they were generated by a temperature anisotropy resulting from a compression on the dayside magnetosphere. SCANDI data show a divergence in thermospheric winds during the TCVs, presumably due to thermospheric heating associated with the current closure linked to a field-aligned current system generated by the TCVs. We conclude that solar wind pressure impulse-related transient phenomena can affect even the upper atmospheric dynamics via current systems established by a magnetosphere-ionosphere-thermosphere coupling process.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1438123

Report Number(s):: LA-UR-18-21091; TRN: US1900407

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 122, Issue 5; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Simultaneous observations of traveling convection vortices: Ionosphere-thermosphere coupling: M-I-T COUPLING OF TCV

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