The role of the ionosphere in coupling upstream ULF wave power into the dayside magnetosphere

Details The role of the ionosphere in coupling upstream ULF wave power into the dayside magnetosphere The role of the ionosphere in coupling upstream ULF wave power into the dayside magnetosphere

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1527e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1527-1542. Research supported by NASA.

Physics

56

Bow Waves, Geomagnetic Micropulsations, Interplanetary Magnetic Fields, Magnetic Disturbances, Magnetosheath, Magnetosphere-Ionosphere Coupling, Ampte (Satellites), Ionospheric Conductivity, Ionospheric Currents, Power Spectra, Shock Wave Propagation

Scientific paper

A series of recent studies of Pc 3 magnetic pulsations in the dayside outer magnetosphere has given new insights into the possible mechanisms of entry of ULF wave power into the magnetosphere from a bow shock-related upstream source. A comparison is made of data from two 10-hour intervals on successive days in April 1986 and then a possible model for transmission of pulsation signals from the magnetosheath into the dayside magnetosphere is presented. Clear interplanetary magnetic field magnitude control of dayside resonant harmonic pulsations and band-limited very high latitude pulsations, as well as pulsation-modulated precipitation of what appear to be magnetosheath/boundary layer electrons are shown. It is believed that this modulated precipitation may be responsible for the propagation of upstream wave power in the Pc 3 frequency band into the high-latitude ionosphere, from whence it may be transported throughout the dayside outer magnetosphere by means of an 'ionospheric transistor'. In this model, modulations in ionospheric conductivity caused by cusp/cleft precipitation cause varying ionospheric currents with frequency spectra determined by the upstream waves; these modulations will be superimposed on the Birkeland currents, which close via these ionospheric currents. Modulated region 2 Birkeland currents will in turn provide a narrow-band source of wave energy to a wide range of dayside local times in the outer magnetosphere.

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