Polarization observations and results of the 1998 February 26th solar corona

Details Polarization observations and results of the 1998 February 26th solar corona Polarization observations and results of the 1998 February 26th solar corona

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999coska..28..216g&link_type=abstract

Contributions of the Astronomical Observatory Skalnate Pleso, vol. 28, no. 3, p. 216-223.

Astronomy and Astrophysics

Astronomy

5

Eclipses, Whitelight Corona, Electron Density

Scientific paper

In the frame of the long-term study program of the solar corona, we have organized an expedition in Curacao (Dutch Antillas) to observe the total solar eclipse of February 26th, 1998. As the totality duration was quite short, we had to improve again the CCD experiment layout in order to record a sample of images as wide as possible in both polarization and brightness ranges. This was made possible by the acquisition of a new PC with fast hard disc and data transfer port. We managed then to record 7 series of different exposures, each containing polarization measurements of 24 images (thus 8 times oversampled). The data processing led to accurate brightness and polarization maps as well as electron density models. The shape of the corona is highly flattened with large polar holes filled by numerous wide plumes. Large streamers are also observed and are essentially aligned along the solar equatorial plane. Moreover, the polarization indicates that these structures are located in the vicinity of the plane of the sky. Unfortunately, the unusually high sky brightness hid the faintest coronal structures and limited the visibility up to 3 solar radii implying a similar limitation in our modelling. We present here these results and give a brief comparison with our previous eclipse observation.

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