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Effective area for the northern polar cap magnetic activity index

✍ Scribed by Papitashvili, V. O.; Rasmussen, O.

Book ID
119652359
Publisher
American Geophysical Union
Year
1999
Tongue
English
Weight
461 KB
Volume
26
Category
Article
ISSN
1944-8007

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## Polar cap patches are regions of enhanced ionization that appear when the interplanetary magnetic field is southward. They are created either in or near the cusp and then convect in an antisunward direction across the dark polar cap at speeds of from 100 m/s to about 2 km/s. The size of these p