We suggest that pressure impulses may be amplified by a factor of 2 by the simultaneous change of the foreshock geometry from lying upstream of the prenoon magnetosphere toward dawn, when the IMF cone angle changes from <300 to >300 .

Abstract.Research results about planetary-scale auroral distributions are presented in a historical retrospective, beginning with the first "maps of isochasms" -lines of equal visibility of auroras in the firmament (Fig. 2) -up to "isoaurora maps" -lines of equal occurrence frequency of auroras in the zenith (Fig. 4). The exploration of auroras in Russia from Lomonosov in the 18th century (Fig.

Citation: Feldstein, Y. I., V. G. Vorobjev, and V. L. Zverev (2011), Comment on "The importance of auroral features in the search for substorm onset process" by Syun-Ichi Akasofu, A. T.

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