Response of the Poleward Boundary of the Nightside Auroral Oval to Impacts of Solar Wind Dynamic Pressure Enhancement
In this paper we have investigated latitudinal variations of the poleward boundary of the nightside auroral oval when the magnetosphere is hit by an enhanced solar wind dynamic pressure front. We used precipitating particle data obtained from Defense Meteorological Satellite Program satellites to...
| Published in: | Journal of Astronomy and Space Sciences |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2010-09-01
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| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2010/v27n3/OJOOBS_2010_v27n3_189.pdf |
| Summary: | In this paper we have investigated latitudinal variations of the poleward boundary of the nightside auroral oval when the
magnetosphere is hit by an enhanced solar wind dynamic pressure front. We used precipitating particle data obtained
from Defense Meteorological Satellite Program satellites to identify the locations of the boundary before and after enhanced
pressure impacts. The boundary locations are represented by a parameter called “b5e”. After performing the
analysis for a number of events, we found that the basic effect of the solar wind pressure increase impact is often (but
not always) to move the poleward boundary of the nightside auroral oval poleward. However, this effect can be often
modified by other factors, such as simultaneous variations of the interplanetary magnetic field with a pressure increase,
and thus the boundary response is not necessarily a poleward shift in many cases. We demonstrate this with specific
examples, and discuss other possible complicating factors. |
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| ISSN: | 2093-5587 2093-1409 |