Slow Changes of Solar Irradiance and Energetics of Active Regions

Details Slow Changes of Solar Irradiance and Energetics of Active Regions Slow Changes of Solar Irradiance and Energetics of Active Regions

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..163..309m&link_type=abstract

Solar Physics, Volume 163, Issue 2, pp.309-317

Physics

2

Scientific paper

A new numerical technique is applied to study long-term variations of total solar irradiance. The background solar flux is estimated not from, e.g., a running mean but as the mode on a moving short time interval. Statistical properties of short-term variations with respect to the running mode are studied. The probability distribution function describing the data from Nimbus-7 is asymmetric and departs from a Gaussian. The ratio of time-integrated short-term negative and positive deviations shows that the energy re-radiated from faculae makes up about 40% of the energy blocked by sunspots. The amplitude and phase relations are studied between deviations which decrease and increase the irradiance. They characterize the mechanism of energy transformation with frequency. The cross-covariance analysis reveals that some parts of the energy blocked by sunspots come to the surface of the Sun after long delays.

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