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Waves at the electron plasma frequency associated with solar wind magnetic holes: STEREO/Cluster observations
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SYSNO ASEP 0353797 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Waves at the electron plasma frequency associated with solar wind magnetic holes: STEREO/Cluster observations Author(s) Briand, C. (FR)
Souček, Jan (UFA-U) RID, ORCID
Henri, P. (FR)
Mangeney, A. (FR)Source Title Journal of Geophysical Research - ISSN 0148-0227
Roč. 115, - (2010), A12113/1-A12113/11Number of pages 11 s. Language eng - English Country US - United States Keywords solar wind ; Langmuir waves ; magnetic holes ; STEREO ; CLUSTER Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GP205/08/P129 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000285838700002 DOI 10.1029/2010JA015849 Annotation Magnetic depressions are common structures of the interplanetary medium. These magnetic holes can be just isolated dips of the amplitude of the field or they can be associated with discontinuities in the field orientation (tangential or rotational). Electrostatic waves at the plasma frequency (Langmuir waves) are often observed in these magnetic structures. The aim of the present paper is to provide the main characteristics of these waves and to propose a mechanism to explain their formation. The study is based on a statistical analysis of observations performed by STEREO and Cluster when each mission was in the free solar wind. We first provide new characteristics of the waves (polarization, energy, spectrum, occurrence). We then show that the occurrence of Langmuir waves activity inside a hole is closely linked to the presence of a significant electron strahl outside the hole. Finally, we propose a scenario for the generation of the Langmuir waves inside the holes. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2011
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