@article{Lacombe:2014:1/5,
author = {Lacombe, C and Alexandrova, O and Matteini, L and Santolik, O and Cornilleau-Wehrlin, N and Mangeney, A and de, Conchy Y and Maksimovic, M},
doi = {1/5},
journal = {The Astrophysical Journal: an international review of astronomy and astronomical physics},
pages = {1--11},
title = {Whistler mode waves and the electron heat flux in the Solar wind: cluster observations},
url = {http://dx.doi.org/10.1088/0004-637X/796/1/5},
volume = {796},
year = {2014}
}

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TY  - JOUR
AB  - The nature of the magnetic field fluctuations in the solar wind between the ion and electron scales is still under debate. Using the Cluster/STAFF instrument, we make a survey of the power spectral density and of the polarization of these fluctuations at frequencies f in [1, 400] Hz, during five years (2001-2005), when Cluster was in the free solar wind. In ~10% of the selected data, we observe narrowband, right-handed, circularly polarized fluctuations, with wave vectors quasi-parallel to the mean magnetic field, superimposed on the spectrum of the permanent background turbulence. We interpret these coherent fluctuations as whistler mode waves. The lifetime of these waves varies between a few seconds and several hours. Here, we present, for the first time, an analysis of long-lived whistler waves, i.e., lasting more than five minutes. We find several necessary (but not sufficient) conditions for the observation of whistler waves, mainly a low level of background turbulence, a slow wind, a relatively large electron heat flux, and a low electron collision frequency. When the electron parallel beta factor β e is larger than 3, the whistler waves are seen along the heat flux threshold of the whistler heat flux instability. The presence of such whistler waves confirms that the whistler heat flux instability contributes to the regulation of the solar wind heat flux, at least for β e ≥ 3, in slow wind at 1 AU.
AU  - Lacombe,C
AU  - Alexandrova,O
AU  - Matteini,L
AU  - Santolik,O
AU  - Cornilleau-Wehrlin,N
AU  - Mangeney,A
AU  - de,Conchy Y
AU  - Maksimovic,M
DO  - 1/5
EP  - 11
PY  - 2014///
SN  - 0004-637X
SP  - 1
TI  - Whistler mode waves and the electron heat flux in the Solar wind: cluster observations
T2  - The Astrophysical Journal: an international review of astronomy and astronomical physics
UR  - http://dx.doi.org/10.1088/0004-637X/796/1/5
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000344550300005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://iopscience.iop.org/article/10.1088/0004-637X/796/1/5
VL  - 796
ER  - 

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