Penetration of hydromagnetic energy deep into the magnetosphere

Details Penetration of hydromagnetic energy deep into the magnetosphere Penetration of hydromagnetic energy deep into the magnetosphere

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1317w&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, Nov. 1989, p. 1317-1325.

Computer Science

12

Earth Magnetosphere, Energetic Particles, Magnetohydrodynamic Waves, Magnetopause, Solar Wind, International Sun Earth Explorers, Magnetometers, Statistical Analysis

Scientific paper

Magnetometer data, acquired on spacecraft and simultaneously at high and low latitudes on the ground, are compared in order to study the propagation characteristics of hydromagnetic energy deep into the magnetosphere. Single events provide evidence that wave energy at L of about 3 can at times be only one order of magnitude lower than at L of about 13. In addition, statistical analyses of the H-component ground-based data obtained during local daytime hours of July 17 to August 3, 1985 show that wave amplitudes at L of about 3 are generally 10-30 times lower than at L of about 13. The L-dependence of near-equator magnetic field fluctuations measured on ISEE-2 show a sharp drop in energy near the magnetopause and a more gradual fall-off of energy deeper inside the magnetosphere. Such high levels of wave power deep in the magnetosphere have not been quantitatively understood previously. The initial attempt is to calculate the decay length of an evanescent wave generated at a thick magnetopause boundary. Numerical calculations show that fast magnetosonic modes (called magnetopause and inner mode) can be generated under very restrictive conditions for the field and plasma parameters. These fast compressional modes may have their energy reduced by only one order of magnitude over a penetration depth of about 8 R(E). More realistic numerical simulations need to be carried out to see whether better agreement with the data can be attained.

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