Dependence of mid-latitude hydromagnetic energy spectra on solar wind speed and interplanetary magnetic field direction

Details Dependence of mid-latitude hydromagnetic energy spectra on solar wind speed and interplanetary magnetic field direction Dependence of mid-latitude hydromagnetic energy spectra on solar wind speed and interplanetary magnetic field direction

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.5977w&link_type=abstract

Journal of Geophysical Research, vol. 85, Nov. 1, 1980, p. 5977-5982.

Physics

6

Energy Spectra, Interplanetary Magnetic Fields, Midlatitude Atmosphere, Solar Wind Velocity, Energetic Particles, Linear Equations, Magnetohydrodynamic Waves, Magnetometers, Regression Analysis

Scientific paper

Relationships are examined between interplanetary parameters and local daytime geomagnetic energy (at Pittsburg, New Hampshire; L approximately 3.5) in three period bands. Ground-based magnetometer data, for 336 hours during July and August 1975, are studied when good interplanetary data coverage was available from instruments on the Imp J spacecraft. Multiple linear regression analyses show that the most important interplanetary parameter controlling ground hourly magnetic energy is the solar wind speed and that hourly magnetic energy in the 30- to 60-s period range is controlled by the solar wind speed and the interplanetary magnetic field direction. The velocity dependence supports the idea of wave production at the magnetopause via the Kelvin-Helmholtz instability which are later observed as magnetic pulsations (30-240 s) on the ground.

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