Geomagnetic conjugate observations of equatorial airglow depletions

Details Geomagnetic conjugate observations of equatorial airglow depletions Geomagnetic conjugate observations of equatorial airglow depletions

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29o..43o&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 15, pp. 43-1, CiteID 1753, DOI 10.1029/2002GL015347

Physics

18

Ionosphere: Ionospheric Dynamics, Ionosphere: Equatorial Ionosphere, Ionosphere: Midlatitude Ionosphere, Atmospheric Composition And Structure: Airglow And Aurora

Scientific paper

We report for the first time large-scale equatorial F-region airglow depletions extending to low-midlatitudes in both hemispheres. The observational sites were located at low-midlatitude geomagnetic conjugate points. Clear depletions of 630.0-nm airglow intensity due to equatorial plasma bubbles were simultaneously observed with two all-sky imagers at Sata, Japan (magnetic latitude 24°N), and its geomagnetic conjugate point, Darwin, Australia (magnetic latitude 22°S), on the night of November 12, 2001. Airglow depletion regions with east-west scale sizes of 40-100 km extend poleward. The maximum apex altitude of the plasma bubbles is about 1,700 km over the geomagnetic equator. The depletions move eastward at about 100 m/s, without changing their structures. The Darwin depletion structures mapped onto the northern hemisphere along the geomagnetic field coincide closely with structures in the Sata images, even for the 40-km structure. These observations indicate that plasma depletions in the equatorial ionosphere elongate along the geomagnetic field lines.

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