Coordinated Observation Of A Small Magnetic Region With GCT And SUMER

Details Coordinated Observation Of A Small Magnetic Region With GCT And SUMER Coordinated Observation Of A Small Magnetic Region With GCT And SUMER

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..707w&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

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The SUMER instrument and the Gregory-Coude-Telescope (GCT) at the Observatorio del Teide/Tenerife have been used for observations of a small magnetic region in the solar atmosphere. With the GCT 2-dimensional spectro-polarimetry was performed and later analysed by applying the "centre of gravity method" (Semel, 1967) to measure the longitudinal magnetic flux. In this way we obtained seven magnetograms of the target area during the three hours campaign, while SUMER performed every five minutes EUV-scans in two spectral lines. The magnetograms show two cells with diameters of approximately 20000 km and 26000 km. Inside the cells the measured flux within the resolution element of 0.76 arcsec*0.76 arcsec. was ~1*109 Wb (corresponding to 33 Gauss flux density) on average. On the other hand the boundary regions have fluxes up to 1*1010 Wb. SUMER's intensity images of Si II (Chromosphere) and C IV (Transition region) show strong brightenings which very well resemble the magnetic flux pattern in the Photosphere. The intensities of Ne VIII (lower Corona) correlate with the magnetic flux as well, but far less than the former two lines. During the 3h observing run the coarse magnetic structure remains essentially unchanged. However, on scales smaller than 3 arcsec., the temporal intensity fluctuations of the EUV-lines show little similarity, if any. Possibly, at small scales the different EUV-lines originate from different structures which are not excited simultaneously.

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