Implications of Ground Based Photometric Images for Long Term Solar Irradiance Variations

Details Implications of Ground Based Photometric Images for Long Term Solar Irradiance Variations Implications of Ground Based Photometric Images for Long Term Solar Irradiance Variations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh53a0303w&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH53A-0303

Physics

7536 Solar Activity Cycle (2162), 7538 Solar Irradiance

Scientific paper

The San Fernando Observatory (SFO) has produced photometric full disk solar images at 5 arc second resolution since 1986, and 2.5 arc second resolution since 1989. We have previously shown that the best quantities for solar irradiance modeling are the photometric sums Σ , defined as the summed residual intensity on these photometric images. In particular, a linear regression of total solar irradiance S to the time series of Σ r and Σ K, the photometric sums in broadband red and Ca~II~K filters, respectively, does an excellent job of reproducing S during cycle 22 (Preminger, Walton, and Chapman 2002, JGR 107, Issue A11, SSH 6-1). We have also shown (Walton, Preminger and Chapman 2003, Solar Phys. 213, 301) that variations in the chromospheric network appear to account for no more than 25% of the change in S over the solar cycle. In this talk, we extend these results to cycle 23 and discuss their implication for long term changes in S. In particular, if Σ r = Σ K = 0 can be taken as representing the complete absence of solar activity, then one would conclude that the minimum level of S is not much below those currently observed at solar minimum; quantitatively, about 0.3 W~m2 below that level.

Affiliated with

Also associated with

No associations

Rating

Implications of Ground Based Photometric Images for Long Term Solar Irradiance Variations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Implications of Ground Based Photometric Images for Long Term Solar Irradiance Variations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Implications of Ground Based Photometric Images for Long Term Solar Irradiance Variations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1463206