The fluctuation and fading of auroral arcs preceding auroral substorm onsets

Details The fluctuation and fading of auroral arcs preceding auroral substorm onsets The fluctuation and fading of auroral arcs preceding auroral substorm onsets

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9.1065m&link_type=abstract

Geophysical Research Letters, vol. 9, Sept. 1982, p. 1065-1068.

Physics

12

Auroral Arcs, Geomagnetism, Polar Substorms, Signal Fading, Emission Spectra, Luminous Intensity, Nitrogen, Oxygen Spectra, Photometers

Scientific paper

Using magnetometer and photometer data, the previously reported visual fading of an auroral arc is shown to be reflected in luminosity changes in individual structures with no obviously related change in the local geomagnetic field. Typically it consists of several low level fluctuations of optical emissions 1 to 4 minutes each in length, followed by a main fading of 4 to 7 minutes duration, leading directly into the break-up sequence. It is noted that these fluctuations may be linked to magnetospheric and/or plasmaspheric oscillations. Such things as previous magnetic activity and surges can often add to the complexity of the event. At present the fluctuations are not seen to be connected with any type of magnetic pulsations, although this may be a factor of resolution or location.

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