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Дата изменения: Tue May 18 17:48:06 2004
Дата индексирования: Tue Oct 2 04:59:29 2012
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Поисковые слова: внешние планеты

Small-Scale Dynamic Events in the Solar Atmosphere

Over the last decade the uninterrupted, high-resolution coverage of the Sun both from the excellent range of telescopes aboard many spacecraft and from ground-based instruments has led to a wealth of observations of small-scale dynamic events observed from the chromosphere to the transition region and corona. Nowadays, there is a general consensus that the key to understanding how the solar plasma is accelerated and heated may well be found in studies of these small-scale events. SoHO observations have further characterized many transient features, such as bi-directional jets, blinkers, coronal jets, and bright points. Work by Gerry Doyle in collaboration with Maria Madjarska, who left the Observatory during 2003 for a position at MSSL, has revealed for the first time the presence of bi-directional jets and magnetic reconnection occurring at coronal hole boundaries. Additional work was done on investigating the connection between the SoHO satellite's discovery of the new `blinker' phenomenon and bi-directional jets (often called explosive events) and spicules on the surface of the Sun. However, perhaps the most interesting and indeed controversial published work relates to why 3-minute oscillations in sunspots are seen in lines normally associated with coronal temperatures. The idea here is that a non-Maxwellian electron distribution can shift the formation of these lines to lower temperatures (for further details, see Section 3.3.5).