Marc R. Hairston

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Cross-track ion drifts measured by the DMSP satellites are compared with line-of-sight SuperDARN HF velocities in approximately the same directions. Good overall agreement is found for a data set comprising of 209 satellite passes over the field of view of nine SuperDARN radars in both the Northern and Southern Hemispheres. The slope of the best linear fit(More)
[1] The question of whether the cross polar cap potential drop in the Earth’s ionosphere saturates under conditions of extreme electric field in the solar wind has been tested observationally during the past several years. The challenge to proving the existence of this phenomenon is that periods of such extreme electric fields in the solar wind are(More)
Interhemispheric contrasts in the ionospheric convection response to variations of the interplanetary magnetic ®eld (IMF) and substorm activity are examined, for an interval observed by the Polar AngloAmerican Conjugate Experiment (PACE) radar system between 1600 and 2100 MLT on 4 March 1992. Representations of the ionospheric convection pattern associated(More)
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Using ionospheric data from the SuperDARN radar network and a DMSP satellite we obtain a comprehensive description of the spatial and temporal pattern of dayside reconnection. During a period of southward interplanetary magnetic field (IMF), the data are used to determine the location of the ionospheric projection of the dayside magnetopause reconnection(More)
Data from HF-radars are used to make the ®rst simultaneous conjugate measurements of the dayside reconnection electric ®eld. A period of 4 h around local magnetic noon are studied during a geospace environment modeling (GEM) boundary layer campaign. The interplanetary magnetic ®eld (IMF) was southward whilst the eastward component (By) was variable. The (More)
The HF radar Doppler spectral width boundary (SWB) in the cusp represents a very good proxy for the equatorward edge of cusp ion precipitation in the dayside ionosphere. For intervals where the Interplanetary Magnetic Field (IMF) has a southward component (Bz < 0), the SWB is typically displaced poleward of the actual location of the open-closed field line(More)
On 7 December 1992, a moderate substorm was observed by a variety of satellites and ground-based instruments. Ionospheric ̄ows weremonitored near dusk by the Goose Bay HF radar and near midnight by the EISCAT radar. The observed ̄ows are compared here with magnetometer observations by the IMAGE array in Scandinavia and the two Greenland chains, the(More)
A −190-nT negative bay in the geomagnetic X component measured at Macquarie Island (−653) showed that an ionospheric substorm occurred during 09:58 to 11:10 UT on 27 February 2000. Signatures of an auroral westward flow channel (AWFC) were observed nearly simultaneously in the backscatter power, LOS Doppler velocity, and Doppler spectral width measured(More)
D. J. KNIPP, • B. A. EMERY, • A.D. RICHMOND, • N. U. C•OOK•,•, • M. R. HAIRSTON, 4 J. A. CUMNOCK, 4 W. F. DENIO, s F. J. RICH, s O. DE LA BEAUJARDIERE, s J. M. RUOHONIEMI, ? A. S. RODGER, s G. CROWLEY, 9 B.-H. ArI•, •ø D. S. EVANS, • T. J. FULLER-ROWELL, • E. FRIIS-CHRISTENSEN, •2 M. LOCKWOOD, •3 H. W. KROEHL, •4 C. G. MACLENNAN, •s A. McEwIs, • R. J.(More)