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Activity of Selected Solar Twins
Shlyapnikov, A. A.; Katsova, M. M.; Nizamov, B. A.
We analyze various tracers of magnetic activity for 23 solar twins which are characterized by significant scatter of lithium abundance in their atmospheres. A level of coronal and chromospheric activity has been studied from available X-ray and UV-archival data. It gives us a chance to compare coronae of solar twins of various ages with the solar …
Co-rotating Solar Wind Disturbances in Radio Sounding Data and Local Measurements
Efimov, A. I.; Smirnov, V. M.; Chashei, I. V. +1 more
In this paper, we present the results of two series of experiments on radio sounding of near-solar plasma by the signals of the Mars Express and Venus Express spacecraft in 2006 and Mars Express in 2008. The radio sounding data are compared with measurements of the proton concentration near the Earth's orbit on the Wind satellite. This analysis sh…