![Hier klicken, um den Treffer aus der Auswahl zu entfernen](images/unchecked.gif) |
Titel |
Depleted magnetic bottle in 90 degrees pitch angle within magnetic cloud |
VerfasserIn |
Katerina Andreeova, Emilia Kilpua, Liisa Juusola, Alexey Isavnin, Rami Vainio, Hannu Koskinen |
Konferenz |
EGU General Assembly 2011
|
Medientyp |
Artikel
|
Sprache |
Englisch
|
Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 13 (2011) |
Datensatznummer |
250047285
|
|
|
|
Zusammenfassung |
An interplanetary magnetic cloud (MC) is an important solar-terrestrial event to study
relations between space weather and Earth’s magnetosphere. We have analyzed a magnetic
cloud (MC) observed by ACE, Wind, and Themis B, and later by Themis C in the solar wind
on 3 September 2008, lasting until 4 September 2008. An Earth-directed coronal mass
ejection (CME) was recorded by coronagraphs onboard SOHO and STEREO B spacecraft on
31 August, 2008. A few days later the north-south oriented MC without the leading
interplanetary shock was observed in sequence by all solar wind monitors from the first
Lagrangian point L1 into close Earth’s vicinity. Minimum variance analysis (MVA) was
used to determine the normal direction and the speed of propagation of the leading
edge of MC, propagating almost perpendicular to the Sun-Earth line (cone angle of
magnetic cloud about 4 degrees), so this event is quite symmetrical and the first
contact point occurred practically on the nose of the magnetopause. Depletions in
suprathermal electrons at 90 degrees pitch angle, occurs often on closed field lines within
CMEs. The halo typically consists of suprathermal electrons that have been scattered
from the strahl or that have been accelerated at interplanetary shock. We show that
depletion of halo electrons can occur as a result of mirroring of suprathermal electrons
associated with connection to magnetic field enhancement beyond the spacecraft. |
|
|
|
|
|