Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...687l.123d&link_type=abstract
The Astrophysical Journal, Volume 687, Issue 2, pp. L123-L126.
Astronomy and Astrophysics
Astronomy
11
Sun: Chromosphere, Sun: Prominences
Scientific paper
We report on a dynamical event observed in a quiescent prominence on 2007 November 8: a well-formed dark ``bubble'' with a bright core rose vertically through the prominence without causing it to erupt. This event was observed in Hα and He I 1083 nm with the instruments of the Mauna Loa Solar Observatory. The dark bubble had a size of over 40'' and rose from the prominence base, at an average speed of ~12 km s-1, forming a bright compression front as it traversed the prominence. It finally assumed a ``keyhole'' shape before fading. The bright core embedded in the dark bubble was observed to rise from the solar limb, accelerating from ~12 to ~20 km s-1, leaving a thin trail of material behind. Subsequent observations indicate that this was not an exceptional event, but rather that similar disturbances do occur occasionally in prominences without disrupting them. In this Letter we present the November 8 observations, and propose a possible interpretation of the physical mechanism behind these dynamic events.
Burkepile Joan T.
Casini Roberto
Chye Low Boon
de Toma Giuliana
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