Apparent progression of intensity variations of the oxygen red line

Details Apparent progression of intensity variations of the oxygen red line Apparent progression of intensity variations of the oxygen red line

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46...39m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Jan. 1984, p. 39-46.

Physics

6

Airglow, Geomagnetism, Magnetic Disturbances, Oxygen Spectra, Auroral Electrojets, F Region, Geomagnetic Micropulsations, Kp Index, Night Sky

Scientific paper

In the nighttime intensity variations of the oxygen 630 nm line, a characteristic intensity variation, which is similar in form to the oxygen 630 nm 'hump' noted by Pal and Kulkarni (1968), is sometimes found. A relatively large number of red line intensifications arise between 0:00 and 3:00 LT and tend to occur on severely geomagnetically disturbed nights and during active sun year periods. By comparing red line intensifications at Yokosuka (35 deg 15 min N; 139 deg 44 min E) with those at Kiso (35 deg 48 min N; 137 deg 38 min E), it is shown that they apparently progress from the north to the south. The apparent speed of progression has been estimated by comparing six cases which were obtained on the same nights at Yokosuka and Kiso. The apparent speeds range from about 280 to 760 m/s. The occurrence of red line intensifications is studied in relation to magnetic activity. It is suggested that they occur in asociation with magnetospheric substorms and that the apparent progression is due to a propagating change in the virtual height of the F-layer (h-prime F). It is noted that the shapes of red line intensifications are similar to those of solitary waves.

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