Comparative study of VHF scintillation and spread F events over Natal and Fortaleza in Brazil

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA088iA08p06253· OSTI ID:5667880

De Medeiros, R T; Abdu, M A; Kantor, I J

A comparative study is carried out of the equatorial ionospheric irregularity occurrences, as observed by range spread F events over Fortaleza (4/sup 0/S, 38/sup 0/W, dip latitude 1.8/sup 0/) and satellite VHF signal scientillation event over Natal (5.8/sup 0/S. 33.23/sup 0/W, dip latitude 4.8/sup 0/S) for a one-year period 1978. Close association is observed in the occurrences and the durations of the irregularities at the two stations. Marked differences in the seasonal behavior of the occurrences of the irregularity events over these two stations are noted with respect to that over Huancayo, most important of them being that while the latter station presents equinoctial maxima in the occurrence rates (as over some African stations), the Brazilian stations show an additional and pronounced peak in December. This result is explained as possible evidence of magnetic declination control of the spread F irregularity generation and its seasonal dependence. The present results have important implications also on the coexistence of different irregularity scale sizes during equatorial plasma bubble irregularity events.

• Research Organization: Instituto de Pesquisas Espaciais, Conselho Nacional de Desenvolvimento Cientifico e Tecnolgico, 12200 Sao Jose dos Campos, Sao Paulo, Brazil
• OSTI ID: 5667880
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 88:A8; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EARTH ATMOSPHERE
F REGION
GEOMAGNETIC FIELD
IONOSPHERE
IONOSPHERIC STORMS
MAGNETIC FIELDS
PLANETARY IONOSPHERES
PLASMA DENSITY
SEASONAL VARIATIONS
SPREAD F
TROPICAL REGIONS
VARIATIONS