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This is the published version of a paper published in Geophysical Research Letters.
Citation for the original published paper (version of record):
Hamrin, M., Andre, M., Norqvist, P., Ronnmark, K. (2000)
The importance of a dark ionosphere for ion heating and auroral arc formation.
Geophysical Research Letters, 27(11): 1635-1638 http://dx.doi.org/10.1029/2000GL003758
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Permanent link to this version:
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85976