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Statistical Relation between Solar Flares and Coronal Mass Ejections with Respect to Sigmoidal Structures in Active Regions
Y. Kawabata, Y. Iida, T. Doi +3
Statistical dependencies among features of coronal mass ejections (CMEs), solar flares, and sigmoidal structures in soft-X-ray images were investigated. We applied analysis methods…
Fermi, Wind, and SOHO Observations of Sustained Gamma-Ray Emission from the Sun
N. Gopalswamy, P. Makela, S. Yashiro +4
We report on the linear relationship between the durations of two types of electromagnetic emissions associated with shocks driven by coronal mass ejections: sustained gamma-ray em…
Extreme Kinematics of the 2017 September 10 Solar Eruption and the Spectral Characteristics of the Associated Energetic Particles
N. Gopalswamy, S. Yashiro, P. Makela +3
We report on the 2017 September 10 ground level enhancement (GLE) event associated with a coronal mass ejection (CME) whose initial acceleration (~9.1km s^-2) and initial speed (~4…
Sun-to-Earth Propagation of the 2015 June 21 Coronal Mass Ejection Revealed by Optical, EUV, and Radio Observations
N. Gopalswamy, P. Makela, S. Akiyama +3
We investigate the propagation of the 2015 June 21 CME-driven shock as revealed by the type II bursts at metric and longer wavelengths and coronagraph observations. The CME was ass…
Long-term Solar Activity Studies using Microwave Imaging Observations and Prediction for Cycle 25
N. Gopalswamy, P. Makela, S. Yashiro +1
We use microwave imaging observations from the Nobeyama Radioheliograph at 17 GHz for long-term studies of solar activity. In particular, we use the polar and low-latitude brightne…