 |
| Titel |
What can simulations of the Kelvin-Helmholtz instability tell us about coronal plasma parameters |
| VerfasserIn |
Markus Scheucher, Ute Amerstorfer, Manuela Temmer, Astrid Veronig |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250086837
|
| Publikation (Nr.) |
 EGU/EGU2014-770.pdf |
|
|
|
|
|
| Zusammenfassung |
| For space weather applications, computer simulations are extremely helpful for the analysis
of detailed physical processes. Especially simulations of the dynamics of the chromosphere
and corona become more and more important to understand the mechanisms that drive solar
eruptions throughout the solar atmosphere and become geoeffective later on while others
don’t or dissipate already in the corona. All these simulations rely mainly on the
determination of all necessary input parameters, but the limited observation capacities make it
hard for modellers and forecasters to get a reliable set of boundary conditions and starting
values for their models which impacts directly the reliability of their results. Recent studies of
Kelvin-Helmholtz instabilities at coronal mass ejection (CME) boundary layers have shown
that these instabilities can form under various conditions of the background plasma
and magnetic fields. The presence or absence of this instabilities may be used to
restrict the conditions of the local plasma parameters and local magnetic fields in the
corona.
Therefore we performed parameter studies of the Kelvin-Helmholtz instability using 2.5D
magnetohydrodynamics simulations of CME boundary layer dynamics, developed from the
Total Variation Diminishing Lax-Friedrichs scheme. We used different plasma parameters,
magnetic field values and orientations as input parameters to investigate how the instability
properties change. The simulation code was also applied to two observations of
eruptive events showing boundary layer instabilities under completely different
conditions. |
|
|
|
|
|
|