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Proton beam velocity distributions in an interplanetary coronal mass ejection

التفاصيل البيبلوغرافية
العنوان: Proton beam velocity distributions in an interplanetary coronal mass ejection
المؤلفون: E. Marsch, S. Yao, C.-Y. Tu
المصدر: Annales Geophysicae, Vol 27, Pp 869-875 (2009)
بيانات النشر: Copernicus Publications, 2009.
سنة النشر: 2009
المجموعة: LCC:Science
LCC:Physics
LCC:Geophysics. Cosmic physics
مصطلحات موضوعية: Science, Physics, QC1-999, Geophysics. Cosmic physics, QC801-809
الوصف: The plasma and magnetic-field instruments on the Helios 2 spacecraft, which was on 3 April 1979 located at 0.68 AU, detected an interplanetary coronal mass ejection (ICME) that revealed itself by the typical signature of magnetic field rotation. The solar wind flow speed ranged between 400 and 500 km/s. We present here some detailed proton velocity distributions measured within the ICME. These cold distributions are characterized by an isotropic core part with a low temperature, T≤105 K, but sometimes reveal a broad and extended hot proton tail or beam propagating along the local magnetic field direction. These beams lasted only for about an hour and were unusual as compared with the normal ICME protons distribution which were comparatively isotropic. Furthermore, we looked into the velocity and field fluctuations in this ICME and found signatures of Alfvén waves, which might be related to the occurrence of the hot proton beams. However, it cannot be excluded that the beam originated from the Sun.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 0992-7689
1432-0576
Relation: https://www.ann-geophys.net/27/869/2009/angeo-27-869-2009.pdf; https://doaj.org/toc/0992-7689; https://doaj.org/toc/1432-0576
DOI: 10.5194/angeo-27-869-2009
URL الوصول: https://doaj.org/article/6cf2dbf986cd4190b93e1aecfb160c1d
رقم الأكسشن: edsdoj.6cf2dbf986cd4190b93e1aecfb160c1d
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:09927689
14320576
DOI:10.5194/angeo-27-869-2009