Electron precipitation associated with geomagnetic activity: Balloon observation of X ray flux in South Atlantic anomaly

Jayanthi, U. B.; Pereira, M. G.; Martin, I. M.; Stozkov, Yu. I.; D'Amico, F.; Villela, T.

doi:10.1029/97ja01817

Cited by 10 publications

(12 citation statements)

References 13 publications

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“…Pinto and Gonzaletz (1986) observed an intensification of X-ray fluxes between 30 and 150 keV in association with a strong geomagnetic storm (maximum |D st | = 291 nT) by the balloon-borne experiments in the SAMA. Jayanthi et al (1997) observed cosmic X-ray fluxes in the energy range between 18.6 to 120 keV by the balloon-borne experiment during a mild storm. They suggested the diffusion of particles from higher L regions into flux tubes connected the SAMA region, due to electric field fluctuations associated with succession of substorms.…”

Section: Discussionmentioning

confidence: 99%

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Unusual ionospheric absorption characterizing energetic electron precipitation into the South Atlantic Magnetic Anomaly

et al. 2014

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An imaging riometer (IRIS) was installed newly in the southern area of Brazil in order to investigate precipitation of energetic electrons into the South Atlantic Magnetic Anomaly (SAMA). An unusual ionospheric absorption event was observed in the nighttime (∼20 h LT) near the maximum depression (D st ∼ −164 nT) and the following positive excursion during the strong geomagnetic storm on September 22-23, 1999. The unusual absorption that has short time-duration of 30-40 min shows two characteristic features: One feature is a sheet structure of the absorption appearing at the high-latitude part of the IRIS field-of-view, showing an eastward drift from the western to the eastern parts and subsequent retreat to the western part. Another feature is a meridionally elongated structure with a narrow longitudinal width (100-150 km) appearing from the zenith to the low-latitude part of the IRIS fieldof-view, enhanced simultaneously with the sheet absorption, and is subsequently changed to a localized structure. These features likely characterize precipitation of energetic electrons into the SAMA ionosphere, associated with substorm occurrences during the strong geomagnetic storm. From the eastward drift (∼250 m/s) of the sheet absorption, precipitating electrons are estimated to be ∼20 keV energies, assuming plasmaspheric electric fields of 1.8 mV/m. However, no ionospheric effect due to the precipitating electrons was definitely detected by the ionosonde measurements at Cachoeira Paulista, separated eastward by about 1000 km from the IRIS station.

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Section: Discussionmentioning

confidence: 99%

“…They considered as the first evidence on the precipitation associated with the geomagnetic activity inside the anomaly region. Jayanthi et al (1997) observed count rate increases of X-rays in the energy range of 15 keV to 120 keV during a mild storm on a stratospheric balloon experiment at L = 1.3 in the SAMA.…”

Section: Introductionmentioning

confidence: 99%

Unusual ionospheric absorption characterizing energetic electron precipitation into the South Atlantic Magnetic Anomaly

et al. 2014

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“…For example, Jayanthi et al (1997) have shown that geomagnetic variations in the H field on the ground station situated in the SAMA region are inversely correlated with the X-ray flux generated by the precipitating electrons (18-120 keV) measured by a balloon launched instrument at 5 mbar height. It means that when H field decreases the mirror heights are lowered and consequently more electrons are precipitated generating increased X-ray flux.…”

Section: Article In Pressmentioning

confidence: 98%

Amplitude enhancement of events in the South Atlantic anomaly region

Trivedi¹,

Abdu

Pathan

et al. 2005

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Several satellites have observed ener getic electron precipitation fluxes in the SAA region (Vampola and Gorney 1983;West and Buck 1976). During a severe magnetic storm, intense energetic electron precipitation could occur over the SAA, producing X-ray ionization and conductivity enhancement in the night time E region (Paulikas 1975;Jayanthi et al 1997). During the great storm of March 1989, near-equatorial ground-based ionosondes in Brazil recorded E layer enhancement due to par ticle precipitation near the magnetic anomaly (Batista et al 1991).…”

Section: Locations Of Madsmentioning

confidence: 99%

ROCSAT-1 Satellite Observations of Magnetic Anomaly Density Structures During the Great Magnetic Storm of July 15-16, 2000

Lin¹,

Yeh²,

Su³

2001

Terr. Atmos. Ocean. Sci.

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Electron precipitation associated with geomagnetic activity: Balloon observation of X ray flux in South Atlantic anomaly

Cited by 10 publications

References 13 publications

Unusual ionospheric absorption characterizing energetic electron precipitation into the South Atlantic Magnetic Anomaly

Unusual ionospheric absorption characterizing energetic electron precipitation into the South Atlantic Magnetic Anomaly

Amplitude enhancement of events in the South Atlantic anomaly region

ROCSAT-1 Satellite Observations of Magnetic Anomaly Density Structures During the Great Magnetic Storm of July 15-16, 2000

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