Search for Signatures of a Coronal Hole in Transition Region Lines Near Disk Center |
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| Authors: | P Lemaire K Bocchialini V Aletti D Hassler K Wilhelm |
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| Institution: | (1) Institut d'Astrophysique Spatiale, Unité mixte CNRS-Université Paris XI, F-91405 Orsay Cedex, France;(2) Southwest Research Institute, 1050 Walnut Street, Boulder, CO 80302, USA;(3) Max Planck Institute für Aeronomie, D-37189 Katlenburg-Lindau, Germany |
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| Abstract: | The analysis of data taken by SUMER near disk center, where a small coronal hole is observed in EIT images, is performed.
From the measurements of Doppler non-thermal velocities and intensities, we search for the diagnostics and the signature of
small scale structures in the coronal hole using transition region lines. Transition region lines in the range of 7 × 104 K to 2.5 × 105 K have a non-thermal velocity excess of 4.0 to 5.5 km s-1 relative to the contiguous quiet Sun. While the average intensity is lower in the coronal hole than in the quiet area, this
result shows an increase of turbulence at the base of the high speed solar wind.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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| Keywords: | Sun coronal hole transition region |
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