SOLAR CYCLE VARIATION OF MICROWAVE POLAR BRIGHTENING AND EUV CORONAL HOLE OBSERVED BY NOBEYAMA RADIOHELIOGRAPH AND SDO/AIA

• DOI: 10.5303/jkas.2017.50.4.125
• Publication Date: 2017-10-30T07:12:37Z
• Authors: Sujin Kim; Jong-Yeop Park; Yeon-Han Kim
• Keywords: Extreme Ultraviolet Lithography; Coronal hole; Extreme ultraviolet; Intensity

We investigate the solar cycle variation of microwave and extreme ultraviolet (EUV) intensity in latitude to compare polar brightening (MPB) with EUV coronal hole (CH). For this study, we used full-sun images observed 17 GHz Nobeyama Radioheliograph from 1992 July 2016 November two channels Atmospheric Imaging Assembly (AIA) <TEX>$193{\AA}$</TEX> <TEX>$171{\AA}$</TEX> on Solar Dynamics Observatory (SDO) 2011 January November. As a result, found that is anti-correlated microwave. Since depression pole mostly owing CH appearance continuation there, anti-correlation implies intimate association between MPB. Considering report Gopalswamy et al. (1999) enhanced brightness seen above photospheric magnetic field, suggest area during minimum has stronger field than quiet sun level such strong results formation CH. The emission mechanism MPB physical link are not still fully understood. It necessary using high resolution imaging data, which can be obtained by performance large-array radio observatories as ALMA project.