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Relative intensity calibration of CDS-GIS detectors on SOHO using a plasma diagnostic technique

Landini, M.; Del Zanna, G.; Landi, E. +3 more

The internal intensity calibration of the Coronal Diagnostic Spectrometer (CDS) - Grazing Incidence Spectrometer (GIS) is studied using the Arcetri diagnostic method. A large number of spectral lines observed by the four GIS detectors in solar active and quiet regions is analysed in order to determine the relative intensity calibration curve of th…

Parametric representation of helioseismic data. I. A method for estimation of mode correlation

Ferrari, A.; Gelly, B.; Schmider, F. -X. +1 more

This paper describes a parametric method aimed at the estimation of correlation in the excitation of solar p modes. Unlike previous work which investigated the correlation in the statistical properties of the mode's power, rather we study the excitation signal itself. In this approach, each mode is represented as a second-order autoregressive proc…