 |
| Titel |
White-light observations of a forming wave ahead of a coronal mass ejection |
| VerfasserIn |
Alexis Rouillard, Dusan Odstrcil, Neil Sheeley, Allan Tylka, Angelos Vourlidas, Glenn Mason, Brian Wood, Chee Ng, Adam Szabo, O. Chris St. Cyr |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053971
|
|
|
|
|
|
| Zusammenfassung |
| Images of the solar corona obtained by the Solar-Terrestrial Relations Observatory
(STEREO) and the Solar and Heliospheric Observatory provide high-cadence,
high-resolution observations of a large-scale density wave forming ahead of a fast Coronal
Mass Ejection (CME) (> 700 km s-1) which erupted on 2010 April 03. The passage of this
wave at 1 AU is detected in situ by the Advanced Composition Explorer and Wind
spacecraft at 08:00UT on April 05 as a shock followed by a turbulent and heated sheath.
These unprecedented and complimentary observations of a shock-sheath region
from the Sun to 1AU are used to investigate the onset of a Solar Energetic Particle
Event (SEP) measured near Earth and at STEREO-B. The spatial extent, radial
coordinates of the central axis and speed of the driver ejecta are measured from SECCHI
observations and used as inputs to a numerical simulation of the CME propagation in the
background solar wind. The simulated magneto-plasma properties of the shock and
sheath near 1AU agree very well with those measured in situ near Earth. These
simulation results reveal that Earth and STEREO-B are magnetically connected to the
Eastern and Western edges of the bow shock. The simulation shows that the nine
hour delay of the SEP onset at Earth relative to the eruption time is consistent with
the time required by the shock to reach the magnetic field line connected with the
Earth. The shock compression ratio is found to grow along the magnetic field line
until the maximum flux of high-energy particles is reached and then levels off. |
|
|
|
|
|
|