A search for coastline effects on the auroras

Details A search for coastline effects on the auroras A search for coastline effects on the auroras

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61..879f&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 12, p. 879-901.

Physics

Scientific paper

A camera on board the Polar spacecraft has provided an unique opportunity to search for coastline effects on the spatial distributions of auroral emissions. This study is motivated by a ground-based report of such shoreline effects on auroral emissions during the Russian Polar Expedition of almost a century ago. This Polar camera, the Low-Resolution Visible Camera of the Visible Imaging System, is capable of obtaining auroral images of the Northern Hemisphere with high spatial and temporal resolutions for extended continuous periods of time, i.e., tens of km, one to several minutes, and many hours, respectively. The entire set of 8588 auroral images at OI 557.7 nm which were gathered during January 1997 were examined for three types of coastal effects, (1) diversion of the auroral arc at the shore, (2) increase of intensity as the arc is followed from sea to land, and (3) decrease of intensity from sea to land. A null test of the results of this auroral survey was conducted by a search of the entire set of images for random coincidences of auroral features in rotated maps of the coastlines. This null test provides support for the occasional transient existence of coastline effects during the onset and early expansion phases of auroral substorms and some auroral intensifications.

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