Geomagnetic storm effects on the thermosphere and the ionosphere revealed by in situ measurements from OGO 6

Details Geomagnetic storm effects on the thermosphere and the ionosphere revealed by in situ measurements from OGO 6 Geomagnetic storm effects on the thermosphere and the ionosphere revealed by in situ measurements from OGO 6

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24.1031m&link_type=abstract

Planetary and Space Science, vol. 24, Nov. 1976, p. 1031-1041.

Physics

1

Gas Density, Hydrogen Atoms, Ionospheric Ion Density, Magnetic Storms, Thermosphere, Time Response, Density Distribution, Helium, Hydrogen Ions, Ogo-6, Oxygen Ions, Satellite Observation

Scientific paper

The temporal response of the densities of upper-atmospheric ion and neutral constituents to a particular geomagnetic storm is studied using simultaneous ion and neutral-composition data obtained by the OGO 6 satellite during consecutive orbits at altitudes greater than 400 km. The investigated constituents include H(+), O(+), N2, O, He, and H. Derivation of the H density is reviewed, and the main effects of the storm are discussed, particularly temporal and global variations in the densities. It is found that: (1) the H and He densities began to decrease near the time of sudden commencement, with the decrease amounting to more than 40% of the quiet-time densities during the maximum stage at high latitudes; (2) the O and N2 densities exhibited an overall increase which began later than the change in H and He densities; (3) the H(+) density decreased differently in two distinct regions separated near the low-latitude boundary of the light-ion trough; and (4) the O(+) density showed an increase during earlier stages of the storm and decreased only in the Northern Hemisphere during the recovery phase. Certain physical and chemical processes are suggested which play principal roles in the ionospheric response to the storm

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