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Influence of coronal mass ejection on geomagnetic activity during 1988–1993

Shrivastava, Pankaj Kumar; Singh, G. N.

The most rapid and dramatic evolution in the solar corona occurs in events now known as Coronal Mass Ejections (CMEs). There have considerable importance for our understanding of the evolution of the mass and energy injected into the interplanetary medium. In this work, we have studied the relation of CMEs with geomagnetic activity for the period …

The Shadow of Comet Hale-Bopp in Lyman-Alpha

Bertaux, Jean-Loup; Lallement, Rosine; Szegö, Karöly +1 more

For a few months around perihelion, the central part of the Hale-Bopp hydrogen cloud has been optically thick to the solar Lyα radiation, and has significantly reduced the solar flux available for the resonance glow of interstellar hydrogen beyond the comet. This shadowing effect on the interstellar gas is the first ever observed comet shadow. It …