Nighttime VHF scintillations at 23 deg N magnetic latitude and their association with equatorial F region irregularities

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · Radio Sci.; (United States)

DOI:https://doi.org/10.1029/RS021i003p00453· OSTI ID:5321847

Dabas, R S; Reddy, B M

Based on ETS-II geostationary satellite (130 deg E) 136-MHz radio beacon amplitudes, a study of postsunset VHF scintillations observed during the January-February 1980 solar maximum period confirms that they are essentially controlled by the generation of equatorial F region irregularities. This latitude is substantially beyond the 84.4 deg E geographic meridian equatorial anomaly daytime crest. Good agreement between the observed scintillation occurrence pattern and characteristics, and previous results reported up to 21 deg N (Somayajulu et al., 1984), is found, and the occurrence of 23 deg N scintillations is found to be conditional to their prior occurrence at lower latitudes. It is also shown that, at least during high solar activity, the equator irregularities extend to altitudes in excess of 1300 km in the Indian sector, and consequently, cause scintillations in a much wider latitudinal belt. 36 references.

• Research Organization: National Physical Lab. of India, New Delhi
• OSTI ID: 5321847
• Journal Information: Radio Sci.; (United States), Journal Name: Radio Sci.; (United States) Vol. 21; ISSN RASCA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASIA
DEVELOPING COUNTRIES
EARTH ATMOSPHERE
F REGION
INDIA
IONOSPHERE
MORPHOLOGY
NOCTURNAL VARIATIONS
PLANETARY IONOSPHERES
SCINTILLATIONS
SOLAR ACTIVITY
VARIATIONS