Dynamics of Transition Region Blinkers

Details Dynamics of Transition Region Blinkers Dynamics of Transition Region Blinkers

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..267b&link_type=abstract

Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a

Computer Science

Scientific paper

Analysis of CDS data has shown that transition region blinkers and the chromosphere directly below, are preferentially more redshifted and have larger non-thermal velocities than the normal transition region and chromospheric plasma. The ranges of these enhanced velocities, however, are no larger than the typical spread of Doppler and non-thermal velocities in these regions. An overview of the Doppler and non-thermal velocities of blinkers found with CDS in the quiet Sun and active region are presented. The anticipated range of Doppler velocities of blinkers are 10 - 15 km s-1 in the quiet-Sun (10 - 20 km s-1 in active-regions) in the chromosphere (He I) and 25 - 30 km s-1 in the quiet-Sun (20 - 40 km s-1 in activeregions) in the transition region (O V). The range of non-thermal velocities of blinkers in both the quiet- Sun and active-regions are estimated to be 15 - 25 km s-1 in He I and 30 - 45 km s-1 in O V. There are more blinkers with larger Doppler and non-thermal velocities than would be expected in the whole of the chromosphere and transition region.

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