Observations of large scale F-region irregularities using airglow emissions at 7774 A and 6300 A

Details Observations of large scale F-region irregularities using airglow emissions at 7774 A and 6300 A Observations of large scale F-region irregularities using airglow emissions at 7774 A and 6300 A

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983angeo...1..271s&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 1, May-June 1983, p. 271-276. Sponsorship: Financiadora de Estudos e Projetos.

Physics

Airglow, F Region, Ionospheric Disturbances, Space Plasmas, Ionospheric Electron Density, Irregularities, Spread F

Scientific paper

The dynamics of low-latitude large scale F-region irregularities were investigated based on simultaneous scanning measurements of the atomic oxygen 7774 A and 6300 A emissions carried out at Cachoeira Paulista (geographic coordinates 22.7 deg S, 45.0 deg W; geomagnetic latitude 11.95 deg S), Brazil, during the period October-November, 1980. A two-channel photometer was used for the measurements, which allowed scanning observations both along and across the magnetic meridian. It is shown that observations at 7774 A can detect large scale irregularities near the F-region peak height, while observations at 6300 A can detect such irregularities at an altitude about 50-100 km lower, depending on the F-region height. It was found that on many nights, during spread-F conditions, the presence of large intensity depletions of short duration were detected in both emissions. It was determined that these depletions moved towards the east in the east-west scans, and apparently towards the south in the north-south scans.

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