Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ijga....5i2011k&link_type=abstract
International Journal of Geomagnetism and Aeronomy, Volume 5, Issue 2, CiteID GI2011
Astronomy and Astrophysics
Astrophysics
1
Solar Physics, Astrophysics, And Astronomy: Corona, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Solar Physics, Astrophysics, And Astronomy: Solar Activity Cycle (2162)
Scientific paper
Daily observations of the corona were processed according to the data of coronagraph SOHO/Large Angle and Spectrometric Coronagraph Experiment (LASCO)-C2 to study the variations of brightness and nonradial direction of coronal streamers during 1996.5-2003.5. Photometry of coronal images was carried out at heights of $2.3~R\odot-5.5~R_{\odot with a step of 2° along position angle. The total number of processed days has been about 4300. The latitude-time distributions of coronal intensity were analyzed at different heights. The maximum brightness of the corona was observed in the equatorial zone in the solar minimum. The drifts of coronal intensity were observed in direction to the poles in the beginning of solar cycle. The maximum brightness of high-latitude corona was observed during the polar magnetic field reversal of the Sun in 1999-2001. The drifts of low coronal brightness were observed in the opposite direction from high latitudes to the equator after polar magnetic field reversal. The angles of deviation from radial direction of coronal streamers were determined on daily coronal images. It was found that coronal streamers were inclined on the whole to the equator during 1996.5-1999.5, although after 1999.5 the streamers were inclined to the poles. The angles of nonradial direction of the streamers reached about 10°-15°. The longitudinal distribution of coronal brightness at various heights was considered. It was compared with heliosphere neutral layer and with drift of filament bands in an epoch of polar magnetic field reversal of the Sun.
Kim Gun-Der
Makarov Valentin I.
Tlatov Andrej G.
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