Resonance excitation of the magnetosphere by hydromagnetic waves incident from solar wind

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X10110048· OSTI ID:21460690

Mazur, V A ^[1]

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1. Russian Academy of Sciences, Institute of Solar-Terrestrial Physics, Siberian Branch (Russian Federation)

The eigenfrequencies and eigenmodes of an MHD cavity in the front part of the magnetosphere and its excitation by monochromatic hydromagnetic waves incident onto the magnetosphere from solar wind are studied theoretically in the model of a plane-stratified plasma. The eigenmodes are damped due to both their absorption at the Alfven resonance points and their emission into solar wind through the magnetopause, which is partially transparent for the excited waves. It is shown that, due to the influence of the magnetospheric cavity, the pumping of the magnetosphere by the incident waves is resonance in character. The waves penetrate into the magnetosphere only if their frequencies lie in narrow spectral ranges near the eigenfrequencies of the cavity, the width of these ranges being on the order of the damping rate of the eigenmodes. Waves with other frequencies are almost completely reflected from the magnetopause.

• OSTI ID: 21460690
• Journal Information: Plasma Physics Reports, Vol. 36, Issue 11; Other Information: DOI: 10.1134/S1063780X10110048; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
58 GEOSCIENCES
EARTH MAGNETOSPHERE
EIGENFREQUENCY
EXCITATION
HYDROMAGNETIC WAVES
MAGNETOHYDRODYNAMICS
MAGNETOPAUSE
RESONANCE
SOLAR WIND
EARTH ATMOSPHERE
ENERGY-LEVEL TRANSITIONS
FLUID MECHANICS
HYDRODYNAMICS
MECHANICS
SOLAR ACTIVITY
STELLAR ACTIVITY
STELLAR WINDS