Flow Map Studies of Supergranule and Mesogranule Evolution from TRACE

Details Flow Map Studies of Supergranule and Mesogranule Evolution from TRACE Flow Map Studies of Supergranule and Mesogranule Evolution from TRACE

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11a0702s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH11A-0702

Physics

7507 Chromosphere, 7509 Corona, 7529 Photosphere, 7546 Transition Region

Scientific paper

From 00:44 UT 22-April-2000 to 00:09 UT 29-April-2000 we obtained a nearly continuous set of white light images using the Transition Region and Corona Explorer (TRACE) satellite. A 384x384 arc second field of view was used that tracked solar rotation from Stonyhurst longitudes 45E to 45W along the solar equator. The total time is nearly 7 days with images taken every minute over most of the interval. The largest temporal gap was 45m and there were only 9 gaps longer than 10m. The area was mostly free of active regions. These images are broad band white light with 0.5 arc second pixels. Granulation is well defined and we used local correlation techniques (LCT) to compute flow maps of the horizontal velocities with a resolution of about 5 arc seconds. The flow map resolution and quality suffer somewhat near the longitude extrema but the maps are usable throughout the 7 days to define supergranules and mesogranules. We compute horizontal divergence to study the motions of mesogranules and the evolution and lifetime of supergranules. When enough telemetry capacity was available, we also obtained co-spatial images in the TRACE Fe IX/X 171Å channel and the 1600Å channel. We use these to study the response of the corona and chromosphere to the photospheric motions. During times with particularly high telemetry throughput, we took white light images every 30 seconds. This allows us to empirically determine the noise in our flow maps using two interleaved and disjoint sets of white light data, each with one minute intervals. This work was supported by NASA contract NAS5-38099.

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