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Sun-as-a-Star, Chromospheric Lines, 1974-2009 View all abstracts by submitter

John Harvey   Submitted: 2009-11-10 15:01

We update the McMath-Pierce spectral line scan archives for Ca II K, He I 10830 A, Ca II 8542 A, and H I 6562 A, both for full disk and center disk. The Ca K3 intensity feature displays a peak-to-peak activity cycle modulation of ~37% and He 10830 Å about 100%. SOLIS observations of the Ca K index suggest a cycle 23-24 minimum in late 2008 followed by a 0.7% rise by late 2009. Other McMath-Pierce indices display no evidence yet of cycle 24. Center-disk Ca K index measurements (optically averaged over the central 2-arcmin), show no particular response to cycle activity, i.e. the quiet disk is constant. A similar null response is found for the center-disk Wilson-Bappu effect.

Authors: Livingston, W., White, O. R., Wallace, L., Harvey, J.

Publication Status: NSO Workshop 25, to be published in Mem. S. A. It.
Last Modified: 2009-11-14 09:51
Go to main E-Print page  On the Correlation between Spectra of Solar Microwave Bursts and Proton Fluxes near the Earth  FORMATION OF TORUS-UNSTABLE FLUX ROPES AND ELECTRIC CURRENTS IN ERUPTING SIGMOIDS  Edit Entry  Download Preprint  Delete Entry 

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