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| Titel |
Solar wind control of the magnetopause location: New insight |
| VerfasserIn |
Zdenek Nemecek, Jiri Simunek, Jana Safrankova, Jih-Hong Shue, Andrey A. Samsonov |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250140348
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| Publikation (Nr.) |
 EGU/EGU2017-3722.pdf |
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| Zusammenfassung |
| The solar wind dynamic pressure is believed to be the principal factor controlling the
magnetopause location. Their mutual relation is usually considered in a power-law form and
suggested indices vary from −1∕4.8 to −1∕6.6 in present magnetopause models. In the
paper, we analyze THEMIS dayside magnetopause crossings observed in a broad range of
upstream pressures (0.2–20 nPa) and discuss the relationship between the dynamic pressure
and the magnetopause stand-off distance and flaring angle. We found that although the
power-law form provides the best description of variations of the stand-off distance with
upstream pressures for a full set of crossings as well as for subsets constrained by
a sign of the interplanetary magnetic field (IMF) vertical component, IMF cone
angle, and solar wind speed, the most appropriate value of the power index resulting
from the present study is −1∕3.83 if only a dependence on the upstream solar wind
pressure is considered. We discuss power index variation dependences on the IMF
direction and solar wind speed and influence of the orbital-spacecraft limitations. |
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