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| Titel |
Proton beam velocity distributions and prominence material in ICME |
| VerfasserIn |
E. Marsch, S. Yao, C. Y. Tu |
| 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 |
250020136
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| Zusammenfassung |
| Abstract
This work discusses two phenomena in Interplanetary Coronal Mass Ejection
(ICME)(1)proton beam velocity distribution (2) cold high-density material. The
plasma and magnetic-field instruments on the Helios 2 spacecraft detected three
events of interplanetary coronal mass ejections, which occurred on 3 April 1979
at the location of 0.68 AU, on 9 May 1979 at 0.29 AU and on 30 March 1976
at 0.48 AU, named as case 1, case 2 and case 3, respectively. All three cases
were revealed by the typical signature of magnetic field rotation, indicating a
force-free magnetic flux tube. We present here, to our knowledge for the first
time, the detailed proton velocity distributions measured within an ICME. In
case 1, a beam velocity distribution was observed which lasted for almost an
hour. These cold distributions were characterized by an isotropic core part with
a low temperature, T ≤ 105 K, and by a broad and extended hot proton beam
propagating along the local magnetic field direction with a speed of a sizable
fraction of the local Alfv |
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