Long term observations performed with instruments on the SOHO and Yohkoh spacecraft, obtained over the rising phase of the current solar cycle 23, provide new data for investigating the solar cycle variation in coronal heating and solar activity. We have used the Coronal Diagnostic Spectrometer (CDS) onboard SOHO to analyze conditions in coronal streamer structures observed close to solar minimum (1996 July 8) and near solar maximum (1999 August 5).
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