The nighttime auroral zone in past epochs

Details The nighttime auroral zone in past epochs The nighttime auroral zone in past epochs

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ge%26ae..27...59f&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 27, Jan.-Feb. 1987, p. 59-63. In Russian.

Physics

Auroral Zones, Night Sky, Nocturnal Variations, Secular Variations, Solar Activity Effects, Solar Wind, Geomagnetism, Magnetic Flux, Solar Terrestrial Interactions

Scientific paper

The location of the nighttime auroral zone for the epochs 800, 1000, 1200, and 1880 is calculated by the projection of various L-shells along the geomagnetic field lines for these epochs. It is shown that the absence of auroras in Norway during 800-1200 cannot be explained solely by secular variations of the geomagnetic field. One possible explanation is a decrease in the electric field strength in the solar wind with respect to the present epoch. This change may be connected with secular variations of solar activity over the past two-thousand years.

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