Observations of the Latitudinal Variation of the Solar Radiance of Non Active Regions of the Sun (original) (raw)

New Eyes to See Inside the Sun and Stars, 1998

Abstract

ABSTRACT The Luminosity Oscillations Imager (LOI) of the VIRGO experiment aboard SOHO provides continuous measurement of the solar irradiance in a 5 nm band around 500 nm. The solar image is broken down in 12 pixels distributed in 4 latitudinal bands. The first year of operation of the instrument has taken place during a period of solar minimum activity. The measurements provide an indication of the distribution of the solar irradiance variations versus latitude. Contributions to the observed variations due to the presence of active regions are discussed in relation to the possible effect of the evolving solar cycle (structure of the convection zone): short term variations versus long term variations. The problem of the photometric stability of the measurements needed for the investigation is thoroughly treated by self consistency and by comparison with other instruments on SOHO (VIRGO sun- photometers and MDI intensity measurements).

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