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| Titel |
Probing the magnetic topology of coronal mass ejections by means of Ulysses/HI-SCALE energetic particle observations |
| VerfasserIn |
O. Malandraki, E. T. Sarris, P. Trochoutsos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 2 ; Nr. 18, no. 2, S.129-140 |
| Datensatznummer |
250013901
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| Publikation (Nr.) |
 copernicus.org/angeo-18-129-2000.pdf |
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| Zusammenfassung |
In this work, solar flare energetic particle
fluxes (Ee ≥ 42 keV) observed by the HI-SCALE instrument onboard
Ulysses, a spacecraft that is probing the heliosphere in 3-D, are utilized as
diagnostics of the large-scale structure and topology of the interplanetary
magnetic field (IMF) embedded within two well-identified interplanetary coronal
mass ejection (ICME) structures. On the basis of the energetic solar flare
particle observations firm conclusions are drawn on whether the detected ICMEs
have been detached from the solar corona or are still magnetically anchored to
it when they arrive at 2.5 AU. From the development of the angular distributions
of the particle intensities, we have inferred that portions of the ICMEs studied
consisted of both open and closed magnetic field lines. Both ICMEs present a
filamentary structure comprising magnetic filaments with distinct electron
anisotropy characteristics. Subsequently, we studied the evolution of the
anisotropies of the energetic electrons along the magnetic field loop-like
structure of one ICME and computed the characteristic decay time of the
anisotropy which is a measure of the amount of scattering that the trapped
electron population underwent after injection at the Sun.
Key words: Interplanetary physics (energetic particles;
interplanetary magnetic fields) |
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