Magnetic-field structure associated with coronal streamers
- 43 Downloads
An interesting coronal structure was observed during the solar eclipse of May 30, 1965. This comprised a series of bright arches centered approximately on a quiescent prominence. A bright ray originated near the top of one of the arches and pointed almost radially away from the photosphere. The ray could be followed for 1.5 solar radii and was deflected towards a direction parallel to the equatorial plane.
By comparing the photographs with Fraunhofer maps and magnetograms, the following interpretation of the structure was obtained. The prominence lies above the neutral line of an extended bipolar magnetic region. The bright arches coincide with flux tubes arising from small photospheric regions of enhanced magnetic-field strength. The ray represents a projection view of a thin region of enhanced plasma density in the neighborhood of a current sheet which separates two flux tubes of opposite polarity. The ray is interpreted as a coronal streamer, and it is suggested that all streamers are related to current sheets.
KeywordsPlasma Density Current Sheet Opposite Polarity Equatorial Plane Flux Tube
Unable to display preview. Download preview PDF.
- Billings, D. E.: 1966, A Guide to the Solar Corona, Academic Press, New York.Google Scholar
- Burlaoa, L. F. and Ness, N. F.: 1967, Report No. X-612–67–278 (Goddard Space Flight Center, Greenbelt, Maryland).Google Scholar
- DeJager, C.: 1959, in Handbuch der Physik (ed. by S. Flügge). Springer Verlag, Berlin, Vol. 52, 225.Google Scholar
- Howard, R.: 1959, Astrophys. J. 133, 983.Google Scholar
- Smith, S. M., Henderson, M. E., and Torrey, R. A.: 1967, NASA Report T.N.D-4012 (NASA Ames Research Center, Moffett Field, California).Google Scholar
- Stepanov, V. E. and Severny, A. B.: 1962, Izv. Krymsk. Astrofiz. Observ. 28, 166.Google Scholar
- Sturrock, P. A.: 1967, Proc. Int. School of Physics ‘Enrico Fermi’, 39th Course, Plasma Astrophysics, Academic Press, New York, p. 168.Google Scholar
- Zirin, H.: 1966, The Solar Atmosphere, Blaisdell, Waltham, Mass., p. 382.Google Scholar