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| Titel |
Multi-spacecraft observations of CIR-associated ion increases during the Ulysses 2007 ecliptic crossing |
| VerfasserIn |
N. Dresing, B. Heber, R. Gómez, R. Mueller-Mellin, R. Wimmer-Schweingruber, A. Klassen |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027303
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| Zusammenfassung |
| The period between June 21 and October 8, 2007 (Carrington rotations 2058 to 2061),
comprising the Ulysses ecliptic plane crossing, was characterized by low solar activity.
Several CIR-related ion increases between 100 keV and 10 MeV were investigated using
multipoint observations from Ulysses, ACE, and the twin STEREO spacecraft. The ballistic
backmapping technique has been used to correlate in-situ observations of these
spacecraft with remote-sensing observations of coronal holes. Due to larger latitudinal
separation between Ulysses and the other spacecraft in Carrington rotations 2058 and
2061, we concentrate on the two Carrington rotations 2059 and 2060 for a more
detailled study of CIR events. Therefore two siginficant CIR-associated ion increases
from day 5 to day 10 of August 2007 and from day 25 to day 31 of August 2007
lend themselves to a more undisturbed comparison. Using the multi spacecraft
measurements we could determine a radial gradient, which is consistent with previous
results by van Hollebeke in 1978 of ~ 350 %/AU using Helios and Pioneer data. |
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