TY - JOUR
T1 - Simultaneous observations of traveling convection vortices
T2 - Ionosphere-thermosphere coupling
AU - Kim, Hyomin
AU - Lessard, Marc R.
AU - Jones, Sarah L.
AU - Lynch, Kristina A.
AU - Fernandes, Philip A.
AU - Aruliah, Anasuya L.
AU - Engebretson, Mark J.
AU - Moen, Jøran I.
AU - Oksavik, Kjellmar
AU - Yahnin, Alexander G.
AU - Yeoman, Timothy K.
N1 - Funding Information:
The work at New Jersey Institute of Technology was supported by the National Science Foundation (NSF) grant AGS-1547252. Research at the University of New Hampshire was supported by NASA grant NNX08AN21G and NSF grant ARC-0806338. The Svalbard induction-coil magnetometer project is supported by NSF grants, AGS-1202267 to Augsburg College, and AGS-1202827 to the University of New Hampshire. The University of Oslo all-sky camera data are available at http://tid.uio.no/plasma/aurora/. The EISCAT data are available from http://www.eiscat.se/. EISCAT is an international association supported by research organizations in China (CRIRP), Finland (SA), Japan (NIPR and STEL), Norway (NFR), Sweden (VR), and the United Kingdom (NERC). The authors thank the EISCAT staff for their outstanding efforts to keep the EISCAT Svalbard Radar running for our RENU rocket campaigns. The work of K. Oksavik was supported by the Research Council of Norway under contracts 212014 and 223252. The work of J. Moen was supported by the Research Council of Norway under contract 230996. The University of Oslo all-sky camera archive is supported by the Research Council of Norway under contract 230935. The work of A. Yahnin is supported by the Russian Science Foundation grant 15-12-20005. The authors also thank the institutes who maintain the IMAGE and DTU Magnetometer Array. Fluxgate magnetometer data from GDH are obtained from the DTU database (https://ftp.space.dtu.dk/data/Ground_magnetometers/Adjusted/). The DMSP spectrogram was obtained through “online spectrograms” service at JHU/APL site http://sd-www.jhuapl.edu/Aurora/. The DMSP particle detectors were designed by Dave Hardy of AFRL. The authors thank NOAA for the access to the POES/MetOp data (http://www.ngdc.noaa.gov/stp/satellite/poes/dataaccess.html). We thank the observatory staff at Lovozero for observations and provision of data.
Publisher Copyright:
©2017. American Geophysical Union. All Rights Reserved.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - 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.
AB - 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.
KW - electromagnetic ion cyclotron waves
KW - neutral wind
KW - plasma convection
KW - transient event
KW - traveling convection vortices
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U2 - 10.1002/2017JA023904
DO - 10.1002/2017JA023904
M3 - Article
AN - SCOPUS:85018970151
SN - 2169-9380
VL - 122
SP - 4943
EP - 4959
JO - Journal of Geophysical Research: Space Physics
JF - Journal of Geophysical Research: Space Physics
IS - 5
ER -