Speaker
Description
Umbra and Penumbra Areas of Sunspot from the Solar and Heliospheric
Observatory image
Thawatchai Sudjai
Department of Physics, Mahidol Wittayanusorn School, Salaya, Phuttamonthon, Nakorn Pathom, 73170
E-mail: thawatchai@mwit.ac.th
Abstract
The areas of umbra and penumbra of sunspots can indicate the magnetic field of the Sun, and the development of the sunspot group. As the size of umbra and penumbra areas depend on the intensity of the magnetic field, recorded of these areas are very important. The pair of sunspot members from opposite magnetic polarity relate to the extension of the areas of umbra, penumbra and group of sunspot areas. In this study, a pixel count in the sun digital imaging from observatory of the solar and heliospheric, NASA, is used. The umbra and penumbra are different level of light intensity. The image processing program can identify the intensity of the black color of the sun digital image. In mode of grey scale, the percentage of the black color is measured. The increase and decrease between the areas of umbra and penumbra are very obvious. The relative of its to the magnetogram data are very distinctly correlation. Both of the pair sunspot and other.
Keywords : Sunspot : Umbra : Penumbra
