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

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

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7533a&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7533-7542. Financiadora de Estudos e Projetos

Physics

18

Atlantic Ocean, E Region, Electron Precipitation, Magnetic Anomalies, Magnetic Storms, Very Low Frequencies, Charged Particles, Kp Index, Magnetic Disturbances, Phase Shift, Signal Measurement, Sporadic E Layer

Scientific paper

Phase recordings of VLF signals transmitted almost entirely within the South Atlantic anomaly region are analyzed to determine the vertical extent of particle precipitation previously detected at E region heights. Signals at a frequency of 13.6 kHz were transmitted from Golfo Nuevo, Argentina and received at Atibaia, Brazil. Significant perturbations characterized by advancements in received signal phase indicative of VLF reflective layer lowering are observed during times of magnetic disturbances, particularly at night. Simultaneous measurements of sporadic E layer parameters over Cachoeira Paulista, Brazil also show enhancements in the blanketing frequency and the top reflected frequency at some delay with respect to magnetic disturbance onset. Results reveal magnetic storm associated ionization enhancements in the height region between about 110 to 70 km which is interpreted as high-energy charged particle precipitation in the South Atlantic magnetic anomaly.

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