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Variations in the atmospheric, near-surface vertical electric field component Ez measured at the Russian Antarctic station Vostok in 1998 are analyzed in conjunction with changes of the interplanetary magnetic field (IMF).
Enhancements in the amplitude of returns from a Medium Frequency (MF)radar at Davis, Antarctica have been identified and their potential use as a measure of PMSE has been explored. A method for finding these enhancements has been applied to data spanning the period from mid-1995 to the end of 1997.
We report the first systematic survey of cosmic ray precursors of geomagnetic storms. Our data set comprises the 14 “major” geomagnetic storms (peak Kp >= 8–) identified by Gosling et al. (1990) together with 25 large storms (peak Kp >= 7–) observed from 1992 through 1998.
This letter explores the hypothesis that gravity wave drag may account for the observed deceleration of the thermospheric anti-sunward wind near the nightside auroral oval, which at times has been seen to reduce to near zero in a horizontal distance of a few hundred kilometres.
Muon observations are complementary to neutron monitor … observations but there are some important differences in the two techniques. Unlike neutron monitors, muon telescope systems use coincidence techniques to obtain directional information about the arriving particle.
Muon observations are complementary to neutron monitor observations but there are some important differences in the two … techniques. Unlike neutron monitors, muon telescope systems use coincidence techniques to obtain directional information about the arriving particle.
The Weimer and IZMEM statistical convection models are driven with a time series of interplanetary magnetic field (IMF) measurements made onboard the Wind spacecraft. The model outputs are used to infer convection velocity at Casey, Antarctica (80.8°S geomagnetic latitude)…
Signatures of the ionospheric cusp in HF digital ionosonde measurements of plasma drift made at the polar cap station Casey, Antarctica (-80.8° geomagnetic latitude) are investigated. Measurements recorded during the campaign interval February 13-17…
The Dopplionogram was developed as a method of displaying Doppler shifts along the frequency axis of ionograms recorded using B-mode soundings of the Dynasonde, an early type of HF digital ionosonde.
Ground-based Fabry-Perot spectrometer observations from the Australian Antarctic stations of Davis and Mawson show an upward wind ~100 m s-1 in the thermosphere at ~240 km altitude on the night of Day of Year 159 in 1997.
The thermopheric oxygen l630 nm emission has been observed using high-resolution Fabry-Perot spectrometers at Mawson (67.6°S, 62.9°E) and Davis (68.6°S, 78.0°E), Antarctica. A new technique, combining the results from the two instruments, is used to derive vector wind fields.