33 citations · 425 across the 25 of their papers we have counts for
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Chromospheric sunspots in the millimeter range as observed by the Nobeyama Radioheliograph
Kazumasa Iwai, Hideki Koshiishi, Kiyoto Shibasaki +3
We investigate the upper chromosphere and the transition region of the sunspot umbra using the radio brightness temperature at 34 GHz (corresponding to 8.8-mm observations) as obse…
Coronal Magnetic Fields Derived from Simultaneous Microwave and EUV Observations and Comparison with the Potential Field Model
Shun Miyawaki, Kazumasa Iwai, Kiyoto Shibasaki +2
We estimated the accuracy of coronal magnetic fields derived from radio observations by comparing them to potential field calculations and the DEM measurements using EUV observatio…
Frequency Dependence of Polarization of Zebra Pattern in Type-IV Solar Radio Bursts
Kazutaka Kaneda, Hiroaki Misawa, Kazumasa Iwai +2
We investigated the polarization characteristics of a zebra pattern (ZP) in a type-IV solar radio burst observed with AMATERAS on 2011 June 21 for the purpose of evaluating the gen…
Observation of Chromospheric Sunspot at Millimeter Range with the Nobeyama 45 m Telescope
Kazumasa Iwai, Masumi Shimojo
The brightness temperature of the radio free-free emission at millimeter range is an effective tool for characterizing the vertical structure of the solar chromosphere. In this pap…