Electromagnetic fluctuations in the vicinity of the magnetopause | Zendy

Rezeau L. | Zendy; Perraut S. | Zendy; Roux A. | Zendy

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Electromagnetic fluctuations in the vicinity of the magnetopause

Author(s) -

Rezeau L.,

Perraut S.,

Roux A.

Publication year - 1986

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/gl013i011p01093

Subject(s) - magnetopause , physics , geostationary orbit , computational physics , geophysics , boundary layer , spacecraft , range (aeronautics) , magnetosphere , magnetic field , spectral line , standard deviation , mechanics , satellite , astronomy , quantum mechanics , statistics , materials science , mathematics , composite material

A detailed analysis of electromagnetic fluctuations recorded during several magnetopause and boundary layer crossings by the ESA GEOS‐2 geostationary spacecraft is presented. A high level of electromagnetic (δE/ δB ∼ V A ) fluctuations in the ULF (0 ‐ 10 Hz) range is observed for each such crossing. The obtained frequency spectra are shown to fit with a power law B² ∼ f −α . The distribution of these α indexes is found to be narrow (standard deviation ≲ 0.25 for 0.5 ≤ f ≤ 11 Hz), with a peak value α ∼ 2.5 which does not depend on the direction with respect to the magnetic field. Data suggest that the magnetopause boundary layer is the source of these intense fluctuations.

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