 |
| Titel |
Geoefficiency of the interplanetary shocks under different IMF conditions |
| VerfasserIn |
Katerina Andreeova, Tuija Pulkkinen, Minna Palmroth |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034113
|
|
|
|
|
|
| Zusammenfassung |
| We have investigated the solar wind-magnetosphere coupling efficiency in response to
interplanetary magnetic field. We investigate fast forward shocks by conducting solar wind
observations and statistical analysis. Our statistical analysis of a set of fast forward shocks
shows that the shock speed in the solar wind and the solar wind dynamic pressure play an
important role for the geomagnetic activity. In particular, analysis of shock propagation inside
the magnetosphere shows that the events with higher speed are associated with
higher ionospheric activity. We complement the observations by results from the
GUMICS-4 global magnetohydrodynamic (MHD) simulation according to IMF direction,
especially Parker-spiral-like structure and radial IMF. The coupling efficiency depends
on the fast forward shock characteristics: it is higher for smaller solar wind Ey
and slower solar wind speed v and smaller for higher Ey and faster solar wind
speed v, it is higher for radial IMF than for Parker-spiral-like structure of IMF. |
|
|
|
|
|
|