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Long-term solar activity studies using microwave imaging observations and prediction for cycle 25
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +1 more
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 brightness temperatures as proxies to the polar and active-region magnetic fields, respectively. We also use the locations of prominence eruptions as a proxy to the filament loc…
Large-scale magnetic fields and anomalies of chemical composition of stellar coronae
Pipin, V. V.; Tomozov, V. M.
We present evidence that anomalies in abundance of the chemical admixtures with the low first ionization potential (FIP) in the low corona of the late-type stars can be related to a topology of the large-scale magnetic field. Observational data from Ulysses and the Stanford Solar Observatory reveal the high correlations between the FIP effect of t…