Streamer disconnection events observed with the LASCO coronagraph

Details Streamer disconnection events observed with the LASCO coronagraph Streamer disconnection events observed with the LASCO coronagraph

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1349w&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 10, p. 1349-1352

Physics

Plasma Physics

24

Interplanetary Physics: Interplanetary Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, And Astronomy: Magnetic Fields, Space Plasma Physics: Magnetic Reconnection

Scientific paper

We present Large Angle Spectrometric Coronagraph (LASCO) observations of two events that suggest magnetic disconnection in coronal streamers. During the 1-2 days preceding each event, successions of narrow looptops are seen rising slowly through the 2-6 RS field of view, forming a bright streamer stalk which continues to elongate with time. As the streamer becomes ever more constricted, it eventually severs at a heliocentric distance of ~4 RS. The lower part of the stalk collapses back to form a cusplike structure extending to ~3 RS, while the disconnected segment is observed as a kink or density enhancement that propagates outward with a speed of order 200 kms-1. We interpret these non-CME events as transient openings and closings of magnetic flux rooted at the boundaries of coronal holes.

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