Magnetic storm associated enhanced particle precipitation in the South Atlantic anomaly: Evidence from VLF phase measurements

Journal Article · Tue Sep 01 04:00:00 EDT 1981 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA086iA09p07533· OSTI ID:6020220

Abdu, M A; Batista, I S; Piazza, L R; Massambani, O

Phase recordings at Atibaia, Brazil (23 /sup 0/S, 46 /sup 0/W), of 13.6 -kHz signal transmitted from Golfo Nuevo, Argentian (43 /sup 0/S, 65 /sup 0/W), a trajectory confined almost completely within the South Atlantic anomaly region, show significant perturbations, indicative of the lowering of the VLF reflection level, following the onset of magnetic disturbances. Simultaneous measurements of the E/sub s/ layer parameters f/sub t/E/sub s/ and f/sub b/E/sub s/ over Cachoeira Paulista (22 /sup 0/S, 45 /sup 0/W) also show enhancements, with some delay with respect to the magnetic disturbance onset, as was found in our earlier work (Batista and Abdu, 1977). These results show magnetic storm associated ionization enhancements taking place in a height region from approximately 110 km down to 70 km, which we interpret as having been produced by precipitation of high-energy charged particles in the South Atlantic magnetic anomaly. The results also suggest some degree of day to day variability in the abundance of metallic species and/or in the dynamics of the E region over this region.

• Research Organization: Instituto de Pesquisas Espaciais, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, 12200 Sao Jose dos Campos, Sao Paulo, Brazil
• OSTI ID: 6020220
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 86:A9; 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
CHARGED-PARTICLE PRECIPITATION
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ION DENSITY
IONIZATION
IONOSPHERE
MAGNETIC STORMS
PHASE VELOCITY
PLANETARY IONOSPHERES
RADIATIONS
RADIOWAVE RADIATION
VELOCITY
WAVE PROPAGATION