34th Solar Physics Division Meeting, June 2003
Session 7 Photosphere and Chromosphere I
Poster, Monday, June 16, 2003, 3:30-5:00pm, Mezzanine

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[7.06] Photospheric Line Equivalent Widths in Calcium K Faculae

S.R. Walton, D.G. Preminger, G.A. Chapman, A.M. Cookson (San Fernando Observatory, Cal State Northridge)

We have recently shown (Preminger, Walton, and Chapman 2002) that the total solar irradiance S can be modeled by a linear combination of photometric quantities which measure the fractional brightness change in the continuum and in the Ca II K line. We concluded that the change in S on solar cycle time scales is caused by variations in spectral lines, not in the continuum.

In order to further test this conclusion, we have begun comparing our photometric Ca II K images with line equivalent width maps made in Fe I 6302.5. Bright features in our K images are well correlated with areas of lower equivalent width. We are beginning to quantitatively measure this correlation and will present further results at the meeting.

This research has been supported by NSF grant ATM-9912132.


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