Background solar velocity spectrum at high and low phases of solar activity cycle

Régulo, C.; Roca-Cortés, T.; Vázquez Ramió, H.
Referencia bibliográfica

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Czech Republic. Ed. A. Wilson. ESA SP-506, Vol. 2. Noordwijk: ESA Publications Division, ISBN 92-9092-816-6, 2002, p. 889 - 892

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Using GOLF/SOHO data a detailed analysis of the solar background spectrum has been performed at high and low phases of solar activity cycle. The analysis includes not only the non-periodic components of the background power spectrum but also the periodic ones. Apart from the solar activity, other causes produce similar effects in the data, particularly the different depths in the solar atmosphere where the measurements are done, because due to the sun-satellite relative velocity, we are observing at different positions in the line profile. Another effect is that different line wings are used in the observation at two different epochs, before and after SOHO loss and recovery which, unfortunately, coincide with minimum and maximum of solar activity. In this work we have tried to separate all these effects in order to really understand what is being seen in the data and ultimately extract the effects of solar activity on the acoustic background solar spectrum.