Observation of low frequency electromagnetic activity at 1000 km altitude

• We present a statistical study of low frequency fluctuations of electric and magnetic fields, commonly interpreted as Alfvenic activity. The data base consists of six months of electric and magnetic field measurements by the Astrid-2 microsatellite. The occurrence of the events is studied with respect to the location and general activity. Large regions of broadband Alfvenic activity are persistently observed in the cusp/cleft and, during the periods of high geomagnetic activity, also in the pre-midnight sector of the auroral oval.

Ämnesord

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

Nyckelord

ionosphere

auroral ionosphere

space plasma physics

waves and instabilities

magnetospheric physics

magnetosphere-ionosphere interactions

ALFVEN WAVES

AURORAL ARC

TECHNOLOGY

TEKNIKVETENSKAP

Publikations- och innehållstyp

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