 |
| Titel |
Solar wind parameters dependence of energy coupling between solar wind and magnetosphere during northward interplanetary magnetic field |
| VerfasserIn |
H. Luo, G. X. Chen |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060344
|
|
|
|
|
|
| Zusammenfassung |
| We statistically study the solar wind parameter dependence of the magnetospheric activities
during northward interplanetary magnetic fields (IMFs) events (Bz > 10 nT, last over 3
hours). It was found that the energy coupling between solar wind and magnetosphere during
northward IMFs was mainly controlled by solar wind velocity and IMF clock angle (θ). A
northward IMF coupling function was derived based on the dimensional analysis and
quantitative analysis of the IMF and the geomagnetic indices. This coupling function can
combine the influences of both IMF θ and solar wind velocity and well describe the energy
input from the solar wind into the magnetosphere during northward IMF events. In
addition, it was shown that when θ is greater than ~ 50o, the energy input increases
remarkably as θ increases. Most importantly, our coupling function can measure the
relative importance between the viscous interaction and the By reconnection in
controlling the energy input into the magnetosphere during northward IMFs. The
viscous interaction will overweigh the By reconnection in the northward IMF events
with θ less than 70o. In contrast, for those northward IMF events with θ greater
than 70o, the By reconnection may be more important than the viscous interaction. |
|
|
|
|
|
|