Radar auroral observations during a burst of irregular magnetic pulsations

Journal Article · Mon Mar 01 00:00:00 EST 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA087iA03p01541· OSTI ID:7040397

Haldoupis, C I; Nielsen, E; Holtet, J A; Egeland, A; Chivers, H A

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).

• Research Organization: Institute of Physics, University of Oslo, Blindern, Oslo 3, Norway
• OSTI ID: 7040397
• Journal Information: J. Geophys. Res.; (United States), Vol. 87:A3, Issue A3
• Country of Publication: United States
• Language: English

Related Subjects

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