Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh23a..05l&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SH23A-05
Physics
7507 Chromosphere, 7509 Corona, 7524 Magnetic Fields
Scientific paper
Filaments in active regions most clearly have the form of long thin ribbons as seen in Hα. The ribbon structure is also readily demonstrated for quiescent filaments when seen from an end view as a filament is transported across the east or west limb due to solar rotation. In addition to the primary ribbon structure, filaments also have shorter, secondary structures called barbs which connect some threads of the main ribbon structure to the chromosphere; these are also seen in the end view of filaments at the limb. This connection with the chromosphere is corroborated in high resolution images of filaments recorded against the disk at the 1-meter Swedish Solar Telescope (SST). In these high resolution Hα movies, the lower parts of all threads are recognizable because they move less freely than the higher parts. The connection of the ends of the threads of the main filament ribbon and the ends of the filament barbs to the chromosphere/photosphere is strong evidence alone that filaments have their own magnetic fields separate from surrounding coronal magnetic fields. The chirality (handedness) of filaments provides further evidence that filaments have their own magnetic fields. The two forms of dextral and sinistral chirality are generally manifest in the relative direction of the deviation of barbs from the main ribbon. However, the sign of chirality is most clear in the thread structure of all barbs seen in Hα images from the SST. From a number of characteristics of the observed mass motions of filament threads of the order of several to tens of kilometers per second, we have previously concluded that filament threads are field-aligned. Therefore we use the threads and their mass motions to construct the 3D configuration of filament magnetic fields. We end this presentation with movies of filaments from STEREO/SECCHI/EUVI consistent with our thread model of filaments.
Engvold Odbjørn
Lin Yangtin
Martín Samuel
Panasenco Olga
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