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

Abstract

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 establishedmore » by a magnetosphere-ionosphere-thermosphere coupling process.« less

Authors:

Kim, Hyomin  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-6350-405X"

Lessard, Marc R. ^[2]; Jones, Sarah L. ^[3]; Lynch, Kristina A. ^[4]; Fernandes, Philip A.  ^[5];

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• Search DOE PAGES for ORCID "0000-0002-3432-8624"

Aruliah, Anasuya L. ^[6]; Engebretson, Mark J.  ^[7];

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• Search DOE PAGES for ORCID "0000-0002-3882-8108"

Moen, Joran I. ^[8]; Oksavik, Kjellmar  ^[9];

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• Search DOE PAGES for ORCID "0000-0003-4312-6992"

Yahnin, Alexander G. ^[10]; Yeoman, Timothy K.  ^[11]

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• Search DOE PAGES for ORCID "0000-0002-8434-4825"

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+ Show Author Affiliations

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

Publication Date:

Sat Mar 11 00:00:00 EST 2017

Research Org.:

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

Sponsoring Org.:

National Aeronautics and Space Administration (NASA); USDOE

OSTI Identifier:

1438123

Report Number(s):

LA-UR-18-21091
Journal ID: ISSN 2169-9380; TRN: US1900407

Grant/Contract Number:  

AC52-06NA25396

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Geophysical Research. Space Physics

Additional Journal Information:

Journal Volume: 122; Journal Issue: 5; Journal ID: ISSN 2169-9380

Publisher:

American Geophysical Union

Country of Publication:

United States

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics; Plasma convection; Magnetopause and boundary layers; Magnetosphere/ionosphere interactions; Solar wind/magnetosphere interactions; Thermospheric dynamics; electromagnetic ion cyclotron waves; neutral