Direct Cluster observation of foreshock electron beams and their correlation with Langmuir waves

0429246 - ÚFA 2015 eng A - Abstract
Souček, Jan - Tomori, Alexander - Basovník, Marek - Sauer, K. - Sydora, R. - Santolík, Ondřej - Fazakerley, A.
Direct Cluster observation of foreshock electron beams and their correlation with Langmuir waves.
Cluster 23rd Workshop : Tromsø, Norway : 16-20 September 2013 : Abstract Book. 2013.
[Cluster Workshop /23./. 16.09.2013-20.09.2013, Tromso]
Institutional support: RVO:68378289
Subject RIV: BL - Plasma and Gas Discharge Physics
http://caa.estec.esa.int/images/cluster_workshops/23/Cluster23_abstract_book_v2.1.pdf

Transient beams of solar wind electrons reflected and accelerated by the bow shock are well known to to produce intense Langmuir waves in the foreshock region. While the foreshock waves are observed easily and consistently by a number of spacecraft, the beams themselves are more difficult to observe directly, due to their transient nature and low density.Under favorable conditions the PEACE instrument of Cluster can observe some of the field-­‐aligned electron beams and the beam energy can be derived from the observations. At other times, a plateau in the electron distribution resulting from the dissipation of the beam by wave-­‐particle interaction is observed. We analyzed several foreshock events in detail and performed a statistics of beam energies. We investigated the correlation between beams and observed waves at the plasma frequency, comparing the results to linear theory and simulations.
Permanent Link: http://hdl.handle.net/11104/0234382