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Journal of Physical Studies 13(2), Article 2901 [6 pages] (2009)
DOI: https://doi.org/10.30970/jps.13.2901 CORONAL STREAMERS ON THE SUN AND THEIR PHYSICAL PROPERTIESG. A. Porfir'eva, G. V. Yakunina, A. B. Delone, A. V. Oreshina, I. V. Oreshina
State Sternberg Astronomical Institute, |
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A brief review on plasma outflows from coronal streamers is presented. The results of the observations in white-light with coronographs LASCO C2 and C3, in UV-lines with UVCS and EUV-lines with EIT aboard the SOHO during different phases of the solar activity cycle are used. Such events as plasma ‟blobs” that are elongated plasma flows from streamers and streamer ejection are considered. The velocities of plasma outflowing from streamers increase from 50 km s$^{-1}$ at 3.5\,$R_☉$ to 300-350\,km s$^{-1}$ at 20-25 $R_☉$. The behaviour of the temperature $T$, electron density $N_{e}$ and intensity $I$ in coronal streamers and surrounding corona in the range of the heliocentric distances from 1.3 $R_☉$ to 5 $R_☉$ are discussed. Some physical parameters seem to depend on the phase of the solar cycle. The data from published scientific papers and Internet have been used.
PACS number(s): 96.60.P-