Observations of auroral fading before breakup

Details Observations of auroral fading before breakup Observations of auroral fading before breakup

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.4207p&link_type=abstract

Journal of Geophysical Research, vol. 83, Sept. 1, 1978, p. 4207-4217. Research supported by the Suomen Kulttuurirahasto; State

Physics

10

Auroral Arcs, Geomagnetism, Magnetic Storms, Polar Substorms, All Sky Photography, Brightness, Electric Fields, Magnetospheric Instability, Radar Scattering, Riometers

Scientific paper

The onset of auroral breakup was studied by means of a variety of instruments with time resolution of some tens of seconds. Rapid sequences of all-sky photographs and fast meridian scans by photometers show that breakup is usually preceded by moderate brightening which is followed by fading of the auroral brightness lasting one or two min, all occurring before the actual breakup. Data from the International Magnetospheric Study magnetometer network might indicate a correlated response by the local auroral and ionospheric currents. Riometer recordings show a slow decrease in ionospheric radio wave absorption over a period of about 10 min prior to breakup. The observations are discussed with reference to the trigger mechanism for the expansion phase of a magnetospheric substorm.

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