Magnetic fields of the magnetosheath

Details Magnetic fields of the magnetosheath Magnetic fields of the magnetosheath

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976rvgsp..14..117f&link_type=abstract

Reviews of Geophysics and Space Physics, vol. 14, Feb. 1976, p. 117-134.

Physics

Space Physics

12

Earth Magnetosphere, Geomagnetism, Magnetic Fields, Magnetosheath, Plasma Sheaths, Solar Wind, Bow Waves, Interplanetary Magnetic Fields, Power Spectra, Propagation Modes, Shock Waves, Steady State, Time Response

Scientific paper

The magnetic field of the magnetosheath is most naturally discussed in terms of its steady state and its fluctuating components. The theory of the steady-state field is quite well developed, and its essential features have been confirmed by observations. The interplanetary field is convected through the bow shock, where its magnitude is increased and its direction changed by the minimal amount necessary to preserve the normal component across the shock. Convection within the magnetosheath usually increases the magnitude still further near the subsolar point and further distorts the direction until the field is aligned approximately tangent to the magnetopause. Fluctuations of the magnetosheath field are very complex, variable, and not well understood. Transverse waves are often dominant at frequencies below 0.002 Hz, and compressional waves are often dominant at somewhat higher frequencies. Perturbation vectors of hydromagnetic waves tend to be aligned with the shock and magnetopause surfaces. Magnetosheath waves may be generated upstream, within the magnetosheath, at the bow shock, or at the magnetopause.

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