Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jgr....79.4603g&link_type=abstract
Journal of Geophysical Research, vol. 79, Nov. 1, 1974, p. 4603-4610.
Astronomy and Astrophysics
Astronomy
21
Astronomical Models, Interplanetary Magnetic Fields, Magnetic Variations, Solar Wind, Time Dependence, Correlation Coefficients, Data Reduction, Explorer 33 Satellite, Flow Velocity, Geomagnetic Tail, Independent Variables, Magnetic Disturbances, Magnetic Flux, Magnetic Storms, Wind Effects
Scientific paper
A statistical study of solar wind data from the Explorer 33 satellite shows that interplanetary magnetic field irregularities are enhanced in the interaction region where a fast solar wind stream overtakes a slower solar wind stream. Comparison with geomagnetic AE and ap indexes further shows that these interplanetary irregularities enhance the level of geomagnetic disturbances. Thus while substorm occurrence is highly correlated with the dawn-dusk component of the solar wind electric field, the amplitude of the substorms is an increasing function of the variance in the interplanetary field. This result can be interpreted as a capacitative effect of the magnetopause that allows a time-varying solar wind electric field to penetrate the magnetosphere more effectively than a static solar wind electric field.
Dessler A. J.
Garrett Henry Berry
Hill Thomas W.
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