[PEM17-P17] Summary of the five-year extended observations of Nobeyama Radioheliograph
Keywords:solar radio, solar flare, solar activity
The original scientific targets were ‘particle acceleration in solar flares’ and ‘long-term solar activity variation’ for this extension. Unfortunately, since the solar flare activity was very low since April 2015, only 38 solar flares (max ~ M6.7 class) were detected during this extension period. Before the extension, about 900 flares were observed. So the increment of solar flare data was not so large. As for the latter topic, we could derive the data of the polar brightening in this solar cycle in addition to the previous two cycles. Then, Gopalswamy et al. (2018) predicted the peak sunspot number of the next solar cycle from the polar brightness at 17 GHz and Fujiki et al. (2019) found the very good correlation between the solar wind speed and the polar brightness at 17 GHz.
One of the most outstanding outcomes is the growth of the international collaboration in this field. Based on this activity, now we are considering the next framework of the international collaboration with the Chinese new solar radio telescope, so-called MUSER.