Thermal coupling of conjugate ionospheres and the tilt of the earth's magnetic field

Details Thermal coupling of conjugate ionospheres and the tilt of the earth's magnetic field Thermal coupling of conjugate ionospheres and the tilt of the earth's magnetic field

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.9017r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Aug. 1, 1986, p. 9017-9021.

Physics

28

Conjugates, Coupling, Ionospheric Tilts, Magnetospheric Ion Density, Temperature Effects, Annual Variations, Attitude (Inclination), Energy Spectra, Hemispheres, Sunlight

Scientific paper

The effect of thermal coupling and the tilt of the earth's magnetic field on interhemispheric coupling is investigated, and, due to a longitudinal displacement in the conjugate points, it is found that the tilt significantly effects the upward flow of H(+) flux such that the maximum upward flux can occur several hours before local sunrise. Heating from the conjugate atmosphere, which accompanies solar illumination in one hemisphere, produces electron temperatures 1000 K higher in the dark than in the sunlit hemisphere, and the morning upward H(+) fluxes in the dark ionosphere are as large as the daytime fluxes. A strong symmetry is also noted in the overall behavior of the H(+) fluxes due to the differing day lengths at the conjugate points, which are separated by 15 deg in latitude. Electron temperatures in the conjugate hemispheres are found to be strongly coupled above the F region peaks, though in the vicinity of the peaks near 250 km, the coupling is weak during the day and strong during the night.

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