The ionospheric signature of Pi 2 pulsations observed by STARE
Journal Article
·
· Journal of Geophysical Research; (United States)
- CSIR, Hermanus (South Africa)
- Max-Planck-Inst. fuer Aeronomie, Katlenburg-Lindau (Germany)
This study extends the work of Sutcliffe and Nielsen (1990) in which a classical Pi 2 pulsation was first isolated in Scandinavian Twin Auroral Radar Experiment (STARE) data. A high-pass-filtering technique is used to remove the background electric field in the STARE data and so reveal the spatial and temporal ionospheric signatures of the Pi 2 pulsation electric fields. A number of events are identified and examples presented in which pulsation electric fields up to 50 mV/m are observed. Magnetic field oscillations computed from the filtered STARE data using the Biot-Savart law correlate well with pulsation magnetometer data. A 180 {degree} phase difference is observed between high- and low-altitude X component pulsations. The ionospheric signature of a Pi 2 is located slightly poleward of the core of the auroral breakup region where the southward, westward, and northward directed background electric fields coverage; the strongest pulsation fields occur in the region of equatorward directed electric fields. The ionospheric electric field patterns of the Pi 2 pulsations determined from the STARE data correlate well with those modeled for a transverse Alfven wave incident on an east-west aligned high-conductivity strip in the ionosphere.
- OSTI ID:
- 7158450
- Journal Information:
- Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 97:A7; ISSN JGREA; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AURORAL ZONES
CORRELATIONS
DIGITAL FILTERS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
GEOMAGNETIC FIELD
HYDROMAGNETIC WAVES
IONOSPHERE
MAGNETIC BAYS
MAGNETIC FIELDS
MEASURING INSTRUMENTS
NOISE
PHYSICAL PROPERTIES
PLANETARY IONOSPHERES
RADAR
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
RANGE FINDERS
WHISTLERS
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AURORAL ZONES
CORRELATIONS
DIGITAL FILTERS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
GEOMAGNETIC FIELD
HYDROMAGNETIC WAVES
IONOSPHERE
MAGNETIC BAYS
MAGNETIC FIELDS
MEASURING INSTRUMENTS
NOISE
PHYSICAL PROPERTIES
PLANETARY IONOSPHERES
RADAR
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
RANGE FINDERS
WHISTLERS