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Line broadening of EUV lines across the solar limb observed by SUMER/SOHO

Published online by Cambridge University Press:  01 November 2006

G. Tsiropoula ,
J. Giannikakis ,
K. Tziotziou  and
E. Antonopoulou
G. Tsiropoula
Affiliation:
Institute for Space Applications and Remote Sensing, National Observatory of Athens, Lofos Koufos, 15236 Palea Penteli, Greece email: georgia@space.noa.gr
J. Giannikakis
Affiliation:
Institute for Space Applications and Remote Sensing, National Observatory of Athens, Lofos Koufos, 15236 Palea Penteli, Greece email: georgia@space.noa.gr Section of Astrophysics, Astronomy and Mechanics, University of Athens, 15784 Zografos, Athens, Greece
K. Tziotziou
Affiliation:
Institute for Space Applications and Remote Sensing, National Observatory of Athens, Lofos Koufos, 15236 Palea Penteli, Greece email: georgia@space.noa.gr
E. Antonopoulou
Affiliation:
Section of Astrophysics, Astronomy and Mechanics, University of Athens, 15784 Zografos, Athens, Greece
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Abstract

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We analyze time series scans of the solar limb performed by the spectrometer SUMER on-board the SoHO satellite. The analyzed dataset consists of observations obtained in the C III 977 Å line. After applying the standard SUMER data reduction procedure, we perform a one line Gaussian fit to the profiles to obtain different parameters for each pixel within the scans. Studying the variations of the line width from the disk to the limb and off-limb we find that it increases off-limb and shows a peak at $\sim15\prime\prime above the limb. We suggest that this increase is due to the random directions of several spicules found along the line of sight.

Keywords

Sun: solar limbspiculesline broadening
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 183 - 184
Copyright
© 2006 International Astronomical Union