 |
| Titel |
The global ionospheric circulation pattern during a Sudden Impulse and the
influence of the interplanetary magnetic field on the dawn-dusk asymmetry. |
| VerfasserIn |
Mirko Piersanti, Federica Marcucci, Igino Coco, Umberto Villante |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141709
|
| Publikation (Nr.) |
 EGU/EGU2017-5245.pdf |
|
|
|
|
|
| Zusammenfassung |
| The definite identification of the characteristics of the geomagnetic response to Solar Wind
(SW) pressure changes represents an interesting element of the magnetospheric dynamics that
is also important in the Space Weather context. In the present analysis, we evaluate
the ionospheric current flow pattern and amplitude in response to several Sudden
Impulses by applying the Piersanti and Villante model [2016] and compare the results
with the convection maps obtained by using SuperDARN radars data in order to
evaluate a global ionospheric circulation pattern from lowest to highest latitude. We
found that, in general, the global structure of twin vortex-like ionospheric flows is
found to be consistent with the twin vortices of ionospheric Hall current deduced by
the geomagnetic field observations. Moreover, we investigate the role of By,IMF
and Bz,IMF on the dawn-dusk asymmetry of flow vortices. We speculate that the
dawn-dusk asymmetry could be caused by the interaction between the pre-existing round
convection cell and a pair of the transient convection vortices associated with SIs. |
|
|
|
|
|
|