The Solar Microwave Flux and the Sunspot Number
Solar and Stellar Astrophysics
2010-03-24 v1
Abstract
The solar F10.7 index is has been a reliable and sensitive activity index since 1947. As with other indices, it has been showing unusual behavior in the Cycle 23/24 minimum. The origins of the solar microwave flux lie in a variety of features, and in two main emission mechanisms: free-free and gyroresonance. In past solar cycles F10.7 has correlated well with the sunspot number SSN. We find that this correlation has broken down in Cycle~23, confirming this with Japanese fixed-frequency radiometric microwave data.
Keywords
Cite
@article{arxiv.1003.4281,
title = {The Solar Microwave Flux and the Sunspot Number},
author = {Leif Svalgaard and Hugh S. Hudson},
journal= {arXiv preprint arXiv:1003.4281},
year = {2010}
}
Comments
SOHO23 Conference Proceedings, Astronomical Society of the Pacific