Dependence of hydromagnetic energy spectra on solar wind velocity and interplanetary magnetic field direction

Details Dependence of hydromagnetic energy spectra on solar wind velocity and interplanetary magnetic field direction Dependence of hydromagnetic energy spectra on solar wind velocity and interplanetary magnetic field direction

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85..114w&link_type=abstract

Journal of Geophysical Research, vol. 85, Jan. 1, 1980, p. 114-118.

Physics

7

Energy Spectra, Geomagnetism, Interplanetary Magnetic Fields, Magnetohydrodynamics, Solar Terrestrial Interactions, Solar Wind Velocity, Daytime, Energy Transfer, Kelvin-Helmholtz Instability, Magnetopause, Velocity Distribution

Scientific paper

The paper examines the relationship of local daytime geomagnetic energy (measured in the period range of 30-300 s at a midlatitude ground-based station) to interplanetary parameters during two time intervals when the solar wind/interplanetary field conditions were quite different. It is found that the geomagnetic energy levels in the entire period band are consistent with production by a Kelvin-Helmholtz instability source at the earth's magnetopause. It is also found that at the shorter periods (30-60 s) the energy may also have a source contribution from the mechanism proposed by Greenstadt, which involves wave energy transfer from the earth's bow shock to the magnetopause. This result represents the first evidence of frequency dependencies in the interplanetary source mechanisms for hydromagnetic energy production in the magnetosphere.

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