Authors
Abstract
This study is dedicated for observing and studying sunspots in the visible and
near infrared regions. Visible and near infrared CCD solar imaging system employing
5 inch reflecting telescope is used. The obtained visible and near infrared solar images
during the period 01-31, January 2007, and their measurements are presented and
compared.
Images obtained with the wavelength 850 nm show sunspot groups of sharp contrast
compared with the visible spectrum images. This leads to larger values of solar
activity measurements R and larger daily total sunspots groups areas . According to
McIntosh sunspot classification the frequency of occurrence among the allowed types
of sunspot groups is the same in the both regions. However , the adoption of
wavelength 850 nm is recommended for reliable sunspot observation and calculation .
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