Zeitschriftenartikel
Christon, S. P.; Mall, U.; Eastman, T.; Gloeckler, G.; Lui, A. T. Y.; McEntire, R. W.; Roelof, E. C.: Solar cycle and geomagnetic N
+/O
+ variation in the outer dayside magnetosphere: Possible relation to topside ionosphere. Geophysical Research Letters
29 (5), 1058 (2002)