Whistler critical Mach number and electron acceleration at the bow shock: Geotail observation

M. Oka, T. Terasawa, Y. Seki, M. Fujimoto, Y. Kasaba, H. Kojima, I. Shinohara, H. Matsui, H. Matsumoto, Y. Saito, T. Mukai

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)


The 'whistler critical Mach number', Mcrit,w is one of the dimensionless parameters that characterizes collisionless shocks. Originally, it was introduced to indicate the critical point above which whistler waves do not propagate upstream. Indeed our analysis of Geotail data at the Earth's bow shock shows intense whistler waves in the sub-critical regime, MA < Mcritw but not in the super-critical regime. In this paper, we further report that Mcritw seems to regulate the electron acceleration efficiency at the shocks. At the shock transition layer it is found that the spectral index Γ of electron energy spectra defined by F(E) ∝ E-Γ is distributed between 3.5 and 5.0 in the sub-critical regime, while the hardest energy spectra with Γ = 3-3.5 are detected in the super-critical regime. We discuss a possible relationship between Mcritw and the electron acceleration.

Original languageEnglish
Article numberL24104
JournalGeophysical Research Letters
Issue number24
Publication statusPublished - 2006 Dec 28


Dive into the research topics of 'Whistler critical Mach number and electron acceleration at the bow shock: Geotail observation'. Together they form a unique fingerprint.

Cite this