 |
| Titel |
Hybrid modeling of time-dependent solar wind–comet interactions |
| VerfasserIn |
Markku Alho, Cyril Simon Wedlund, Esa Kallio, Hans Nilsson |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250136743
|
| Publikation (Nr.) |
 EGU/EGU2016-17850.pdf |
|
|
|
|
|
| Zusammenfassung |
| Global hybrid plasma modelling of cometary environments is an essential tool in
understanding the global implications of point measurements performed by the Rosetta probe
in the vicinity of 67P/Churyumov-Gerasimenko. A 3-D, global hybrid plasma model,
including the effects of plasma-driven ionization of cometary neutrals, has been employed to
model an approximation of 67P’s environment around perihelion conditions. Model inputs
include solar wind upstream parameters, a simple cometary neutral model and a H2O+-bound
photochemistry.
In this work we present results on the responses of a cometary plasma environment when
impinged upon by a time-dependent solar wind. Stepwise upward and downward density
changes as well as linear ramps are investigated, along with tangential discontinuities in the
interplanetary magnetic field. As the production rates of cometary ions are coupled to solar
wind parameters through e.g. charge exchange and electron impact ionization, solar wind
variations create non-trivial transient phenomena in the cometary environment. Implications
for CME impacts and tail disconnection events are explored, giving insight on how these
events may appear in the observational datasets (magnetometer, ion spectrometer) from past
missions and from Rosetta. |
|
|
|
|
|
|