Characterization of Solar Noise in Irradiance from VIRGO
Abstract
Power spectral analysis of measurements of total and spectral solar irradiance show a similar general behavior for periods between two minutes to 50 days as found by Frohlich et al. (1997) with a much shorter time series. While the time series are extended, low frequencies become accessible and the influence of the increasing solar activity can be studied. Furthermore, the temporal variation of the influence of supergranulation, mesogranulation, and granulation is investigated. With multivariate spectral analysis the contribution of three spectral channels, blue, green and red, to the variance of the total channel are determined. The difference in gain of the spectral channels is investigated for the frequency range corresponding to magnetic activity or to convection in the range from supergranulation to granulation. Moreover, the temporal variations of the contribution of each channel to the total is studied.
- Publication:
-
Structure and Dynamics of the Interior of the Sun and Sun-like Stars
- Pub Date:
- 1998
- Bibcode:
- 1998ESASP.418...91A