Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..193o&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
2
Solar Irradiance: Variations, Solar Flares
Scientific paper
Observations made with radiometers on board of space missions offer us the total solar irradiance (TSI) data since 1978 (from ERB/Nimbus to VIRGO/SOHO). This 25-year interval made possible the reveal of the 11-year cycle variability in the data series, with a difference in amplitude of about 0.15% from minimum to maximum. A major part of this variation is explained as a combined effect of the sunspots blocking and the intensification due to bright faculae and plages, with a slight dominance of the bright features effect. The empirical models based only on contrast photospheric or chromospheric measurements can explain maximum 90% of the TSI variation. We evaluate the possible effect of solar flares on TSI variation taking into consideration the Hα line and the 1-8 Å X-ray domain. For this approach, we use the Q index for Hα flares and the Qx index for X-ray flares (calculated by us in a similar manner). We investigate the spectral features in these three series of data (TSI, Q and Qx) together with their time evolution using some of the tools provided by Joint Time-Frequency Analysis.
Maris Georgeta
Mierla Marilena
Oncica Adrian
Popescu Miruna Daniela
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