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Title: Radar auroral observations during a burst of irregular magnetic pulsations

Abstract

Micropulsation data from an auroral state are compared with concurrent STARE radar observations from the E region above the station during a substorm event. The substorm onset is marked by a strong burst of irregular pulsations, (Pi B) accompanied by abrupt intensifications in the equivalent current, the backscatter intensity, and the riometer absorption. The magnetic Px and Py pulsation components have a reasonable degree of correlation and the polarization properties of the horizontal disturbance vetor exhibit well-defined changes during the first few minutes after onset. The radio signal undergoes deep quasiperiodic fading that is closely related to simultaneous PiB amplitude variations. The radar Dopplar data, which show normal fluctuations in the electron drift velocity, exclude modulation of radio backscatter by directional variations of the electric field. It is argued that the PiB pulsations and the variations seen in the backscatter are reflecting changes of the ionospheric currents due to conductivity modifications dictated by variations in the field-aligned currents flowing in the region. The possibility exists that the Pi B is closely related to precipitation pulsations as reported by Heacock and Hunsucker (1977).

Authors:
; ; ; ;
Publication Date:
Research Org.:
Institute of Physics, University of Oslo, Blindern, Oslo 3, Norway
OSTI Identifier:
7040397
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 87:A3; Journal Issue: A3
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AURORAE; BACKSCATTERING; MAGNETOSPHERE; PULSATIONS; E REGION; ELECTRIC CURRENTS; GEOMAGNETIC FIELD; MAGNETIC BAYS; PLASMA DRIFT; POLARIZATION; RADAR; CURRENTS; EARTH ATMOSPHERE; IONOSPHERE; MAGNETIC FIELDS; MEASURING INSTRUMENTS; PLANETARY IONOSPHERES; RANGE FINDERS; SCATTERING; 640201* - Atmospheric Physics- Auroral, Ionospheric, & Magetospheric Phenomena

Citation Formats

Haldoupis, C I, Nielsen, E, Holtet, J A, Egeland, A, and Chivers, H A. Radar auroral observations during a burst of irregular magnetic pulsations. United States: N. p., 1982. Web. doi:10.1029/JA087iA03p01541.
Haldoupis, C I, Nielsen, E, Holtet, J A, Egeland, A, & Chivers, H A. Radar auroral observations during a burst of irregular magnetic pulsations. United States. https://doi.org/10.1029/JA087iA03p01541
Haldoupis, C I, Nielsen, E, Holtet, J A, Egeland, A, and Chivers, H A. 1982. "Radar auroral observations during a burst of irregular magnetic pulsations". United States. https://doi.org/10.1029/JA087iA03p01541.
@article{osti_7040397,
title = {Radar auroral observations during a burst of irregular magnetic pulsations},
author = {Haldoupis, C I and Nielsen, E and Holtet, J A and Egeland, A and Chivers, H A},
abstractNote = {Micropulsation data from an auroral state are compared with concurrent STARE radar observations from the E region above the station during a substorm event. The substorm onset is marked by a strong burst of irregular pulsations, (Pi B) accompanied by abrupt intensifications in the equivalent current, the backscatter intensity, and the riometer absorption. The magnetic Px and Py pulsation components have a reasonable degree of correlation and the polarization properties of the horizontal disturbance vetor exhibit well-defined changes during the first few minutes after onset. The radio signal undergoes deep quasiperiodic fading that is closely related to simultaneous PiB amplitude variations. The radar Dopplar data, which show normal fluctuations in the electron drift velocity, exclude modulation of radio backscatter by directional variations of the electric field. It is argued that the PiB pulsations and the variations seen in the backscatter are reflecting changes of the ionospheric currents due to conductivity modifications dictated by variations in the field-aligned currents flowing in the region. The possibility exists that the Pi B is closely related to precipitation pulsations as reported by Heacock and Hunsucker (1977).},
doi = {10.1029/JA087iA03p01541},
url = {https://www.osti.gov/biblio/7040397}, journal = {J. Geophys. Res.; (United States)},
number = A3,
volume = 87:A3,
place = {United States},
year = {Mon Mar 01 00:00:00 EST 1982},
month = {Mon Mar 01 00:00:00 EST 1982}
}