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Gurgiolo et al. 2005
Gurgiolo, C., Goldstein, M.L., Narita, Y., Glassmeier, K.-H. and Fazakerley, A.N. (2005). A phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shock. Journal of Geophysical Research 110: doi: 10.1029/2005JA011010. issn: 0148-0227.

Observations of nongyrotropic electron distributions in the region upstream of the Earth's bow shock suggest that there exists a mechanism to lock in their phase, otherwise they would rapidly gyrophase mix into a ring-beam distribution. Measurements by the Plasma Electron and Current Experiment (PEACE) on the Cluster spacecraft have provided a way of determining the rotational period of a nongyrotropic electron distribution. For the time period studied, the rotational period is found to be ≈0.5 Hz, significantly lower than the local Larmor frequency but in line with the frequency of waves observed in the local magnetic field. Detailed wave analysis has revealed that the waves are most likely ordinary right-hand whistler waves. The conclusion is that the waves provide the necessary phase locking mechanism. It is not clear whether those waves are generated by the nongyrotropic distribution or are produced by other means and then cause the observed nongyrotropy.

BACKGROUND DATA FILES

Abstract

Keywords
Interplanetary Physics, Planetary bow shocks, Interplanetary Physics, Plasma waves and turbulence, Interplanetary Physics, Solar wind plasma, Interplanetary Physics, General or miscellaneous, nongyrotropic electrons, upstream
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
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