Physics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..679w&link_type=abstract
Planetary and Space Science, vol. 27, May 1979, p. 679-689. Science Research Council
Physics
14
Cold Plasmas, Earth Magnetosphere, Exosphere, Geomagnetic Micropulsations, Polar Regions, Flight Time, Magnetohydrodynamic Waves, Plasma Density, Proton Density (Concentration), Troughs
Scientific paper
High latitude geomagnetic field lines differ significantly from a dipole geometry. Time of flight calculations using the Mead-Fairfield (1975) model of the geomagnetic field are presented for different tilt angles and Kp conditions. Typical standing wave periods of geomagnetic pulsations are estimated for three different magnetospheric cold plasma regions, corresponding to waves guided in (1) the plasmatrough, (2) the extended plasmasphere, and (3) regions of enhanced proton density (detached plasma) within the plasmatrough. Pc4/5 pulsation studies at high latitudes are briefly reviewed and some new results from Tromso are given. Many of the observations reveal hydromagnetic waves whose location and period are consistent with ducting in a region of enhanced plasma density within the plasmatrough.
Orr Daniel
Warner Michael R.
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