| Title: |
Simultaneous observations of traveling convection vortices: Ionosphere-thermosphere coupling |
| Authors: |
Hyomin Kim; Marc R. Lessard; Sarah L. Jones; Kristina A. Lynch; Philip A. Fernandes; Anasuya L. Aruliah; Mark J. Engebretson; Jøran I. Moen; Kjellmar Oksavik; Alexander G. Yahnin; Timothy K. Yeoman |
| Publication Year: |
2017 |
| Collection: |
University of Leicester: Figshare |
| Subject Terms: |
Science & Technology; Physical Sciences; Astronomy & Astrophysics; FIELD-ALIGNED CURRENTS; FLUX-TRANSFER EVENTS; GROUND MAGNETIC SIGNATURES; LATITUDE BOUNDARY-LAYER; SOLAR-WIND; VORTEX EVENT; IMPULSE EVENTS; TWIN VORTICES; NEUTRAL WINDS; MAGNETOSPHERE |
| Description: |
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. |
| Document Type: |
article in journal/newspaper |
| Language: |
unknown |
| Relation: |
2381/40222 |
| Availability: |
https://figshare.com/articles/journal_contribution/Simultaneous_observations_of_traveling_convection_vortices_Ionosphere-thermosphere_coupling/10230095 |
| Rights: |
All Rights Reserved |
| Accession Number: |
edsbas.97A2D08D |
| Database: |
BASE |