Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21010901q&link_type=abstract
American Astronomical Society Meeting 210, #109.01; Bulletin of the American Astronomical Society, Vol. 39, p.233
Other
Scientific paper
Viewed through telescopes, the Sun is a restless star. Frequently, impulsive brightenings in the Sun's atmosphere, known as solar flares, are observed across a broad range of the electromagnetic spectrum. It is considered that solar flares are driven by magnetic reconnection, when anti-parallel magnetic field lines collide and reconnect with each other, efficiently converting free magnetic energy into heating plasmas and accelerating charged particles. Over the past decades, solar physicists have discovered observational signatures as indirect evidence for magnetic reconnection. Careful analyses of these observations lead to evaluation of key physical parameters of magnetic reconnection. Growing efforts have been extended to understand the process of magnetic reconnection in some of the most spectacular explosions on the Sun in the form of coronal mass ejections (CMEs). Often accompanied by flares, nearly once a day, a large bundle of plasma wrapped in magnetic field lines is violently hurled out of the Sun into interplanetary space. This is a CME. CMEs are driven magnetically, although the exact mechanisms remain in heated debate. Among many mysteries of CMEs, a fundamental question has been the origin of the specific magnetic structure of CMEs, some reaching the earth and being observed in-situ as a nested set of helical field lines, or a magnetic flux rope. Analyses of interplanetary magnetic flux ropes and their solar progenitors, including flares and CMEs, provide an observational insight into the role of magnetic reconnection at the early stage of flux rope eruption.
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