Abstract
In order to understand the processes of formation and motion of sun-aligned polar cap arcs as well as patches, we have analyzed simultaneous observational data from Akebono (EXOS D) satellite and the all-sky imager at Qaanaaq, Greenland. The results demonstrate the correspondence between the localized electron precipitation signatures observed from Akebono and the sun-aligned arcs seen from the all-sky imager at Qaanaaq, and confirm that sun-aligned arc correspond to divE<O. The average energy of precipitating electrons is in the range from 100eV to 200eV. The magnetosheath/mantle is likely the source region of the precipitating electrons. For patches, most drifted anti-sunward, but some ceased to drift within the field of view of the all-sky imager. Comparison between patch movement and the plasma convection velocity demonstrates a general consistency between them.
Original language | English |
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Pages (from-to) | 1337-1340 |
Number of pages | 4 |
Journal | Advances in Space Research |
Volume | 22 |
Issue number | 9 |
DOIs | |
Publication status | Published - 1998 |
Externally published | Yes |
ASJC Scopus subject areas
- Aerospace Engineering
- Astronomy and Astrophysics
- Geophysics
- Atmospheric Science
- Space and Planetary Science
- Earth and Planetary Sciences(all)