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Title: Multi-radar mapping of auroral convection

Abstract

Simultaneous radar azimuth scans with the Millstone Hill, Sondrestrom, and EISCAT incoherent scatter radars produce maps of the ionospheric convection electric field at high latitudes which span 10 hours of magnetic local time. A series of convection snapshots made during an interval of increasing geomagnetic activity indicate that the large-scale convection pattern maintains a two-cell character during substorm onset and that average convection models derived from radar data provide a reasonable representation of the large-scale convection pattern during dynamically varying conditions.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Haystack Observatory, Westford, MA (USA)
OSTI Identifier:
7166346
Report Number(s):
AD-A-215140/5/XAB
Resource Type:
Technical Report
Resource Relation:
Other Information: Pub. in Advances in Space Research, Vol. 9, No. 5, (5)19-(5)27(1989)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AURORAE; CONVECTION; ELECTRIC FIELDS; AZIMUTH; GEOMAGNETIC FIELD; IONOSPHERE; MAGNETIC FIELDS; MAGNETIC STORMS; MAPPING; MATHEMATICAL MODELS; RADAR; SCATTERING; SYNCHRONIZATION; EARTH ATMOSPHERE; ENERGY TRANSFER; HEAT TRANSFER; MASS TRANSFER; MEASURING INSTRUMENTS; PLANETARY IONOSPHERES; RANGE FINDERS 640201* -- Atmospheric Physics-- Auroral, Ionospheric, & Magetospheric Phenomena

Citation Formats

Foster, J.C., Turunen, T., Pollari, P., Kohl, H., and Wickwar, V.B. Multi-radar mapping of auroral convection. United States: N. p., 1989. Web.
Foster, J.C., Turunen, T., Pollari, P., Kohl, H., & Wickwar, V.B. Multi-radar mapping of auroral convection. United States.
Foster, J.C., Turunen, T., Pollari, P., Kohl, H., and Wickwar, V.B. 1989. "Multi-radar mapping of auroral convection". United States. doi:.
@article{osti_7166346,
title = {Multi-radar mapping of auroral convection},
author = {Foster, J.C. and Turunen, T. and Pollari, P. and Kohl, H. and Wickwar, V.B.},
abstractNote = {Simultaneous radar azimuth scans with the Millstone Hill, Sondrestrom, and EISCAT incoherent scatter radars produce maps of the ionospheric convection electric field at high latitudes which span 10 hours of magnetic local time. A series of convection snapshots made during an interval of increasing geomagnetic activity indicate that the large-scale convection pattern maintains a two-cell character during substorm onset and that average convection models derived from radar data provide a reasonable representation of the large-scale convection pattern during dynamically varying conditions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1989,
month = 1
}

Technical Report:
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  • The objective is to provide real time surveillance of short term predictions in the electrodynamic state of the ionosphere and magnetosphere. The desired approach is to obtain all necessary environmental information by remote sensing or by in situ sampling from satellites; the necessary quantities include electric fields, ionospheric conductivities, and field-aligned currents. Recently, a DMSP (Defense Meteorological Satellite Program) satellite has been launched from (Flight 7) equipped with a triaxial fluxgate magnetometer. To qualify this type of instrument for participation in the above objective, an investigation was invested to field aligned currents estimated from two different approaches: using magnetometer measurementsmore » made from the DMSP-F7 satellite and using ionospheric measurements made by the Sondrestrom incoherent scatter radar. Three events are analyzed when near-simultaneous measurements were made by both instruments during satellite passes over the radar. Varying degrees of correlation were found in the derived field-aligned currents. In all three cases, the gross features measured by the two methods were similar. The differences are discussed in terms of measurement error, analysis approximation, and geophysical uncertainties.« less
  • No abstract available.
  • Sondrestrom incoherent-scatter radar observations of ionospheric plasma density and temperature distributions have been examined, as well as measurements of F-region ion drifts that were made during a prenoon pass by the DMSP-F7 satellite through the radar field of view. The spacecraft traversed a region of intense electron precipitation with a characteristic energy below approximately 200 eV. Particles with such low characteristic energies are believed to originate, either directly or indirectly, in the magnetosheath. The precipitation region had a width of about 2 deg invariant latitude. The corotating radar observed a patch of enhanced electron density and elevated electron temperature inmore » the F2 region between about 10.5 and 12 magnetic local time in the same invariant latitude range where DMSP-F7 detected the soft-electron flux. The ion drift pattern, also obtained by radar, shows that it is unlikely that the plasma patch was produced by solar radiation and advected into the radar field of view. The authors suggest that the radar observed modifications of the ionospheric plasma distribution resulted from direct entry of magnetosheath electrons into the magnetosphere and down to ionospheric altitudes. Model calculations of the ionospheric response to the observed electron flux support this interpretation.« less
  • The objectives of this project were to study the coupling between the ionosphere and the magnetosphere, and to understand how this coupling was affected by changes in the solar wind. The data used consisted of satellite measurements coordinated with Sondrestrom incoherent scatter radar observations. The authors focused their efforts on the study of temporal and spatial changes in the dayside auroral precipitation and electric field.