Estimating the long-term variations of the magnetotail pressure

Details Estimating the long-term variations of the magnetotail pressure Estimating the long-term variations of the magnetotail pressure

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923747n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,747-23,751

Physics

3

Earth Magnetosphere, Geomagnetic Tail, Geomagnetism, Plasma Pressure, Solar Cycles, Solar Wind, Time Dependence, Variations, Solar Activity, Solar Terrestrial Interactions, Sunspot Cycle

Scientific paper

Semiannual values of the dynamic pressure and the static pressure in the solar wind are calculated for 1965-1988. Using the statistical relationship between the tail lobe magnetic field and solar wind parameters, variations of the magnetic field pressure in the magneitc lobe at X = -20 R(sub E) are predicted. This prediction is compared with various satellite observations of the total pressure, although systematic observations were not available on a continuous basis. It is predicted that the semianual value of the magnetotail total pressure exhibits the variation with a period of approximately equal to 11 years in close conjuction with the solar cycles. The magnetotail total pressure tends to be minimum at the maximum epoch of the sunspot number.

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