Other
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..383c&link_type=abstract
In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze
Other
2
Sun, Coronal Holes, Euv
Scientific paper
Synoptic data from the Normal Incidence Spectrometer (NIS) on SoHO-CDS (Coronal Diagnostic Spectrometer), have been used to study six solar rotations ranging from solar minimum (August 1996) to the recent solar maximum (September 2001), in order to estimate the proportion of the solar surface covered by coronal holes and how this varies with time. A partially automated method has been developed to distinguish coronal holes from other low emission regions - prominences and prominence channels - using the EUV line Mg IX (368.06 Å) from the synoptica data. Measurements of the daily coronal hole area obtained from a 4 arcmin wide strip along the central meridian were combined for each full solar rotation. the derived coronal hole area shows an inverse relationship to the sunspot number, varying from 12.8% at solar minimum to 2.2% at solar maximum.
Bromage Barbara J. I.
Chapman S. A.
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