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Active regions near the recent solar-cycle minimum: Relation between plasma heating and electrical currents
Livshits, M. A.; Rudenko, G. V.; Grigor'eva, I. Yu. +1 more
Data on small active regions on the Sun collected over three years (2007-2009) are analyzed. Under very quiescent conditions (a low X-ray background level), the shapes of the coronal loops of some active regions correspond fairly well to the shapes of magnetic-field lines calculated in a potential approximation. This is true of several active regi…
Low-energy 3He and 4He ions in interplanetary space during quiet periods of the 23rd solar cycle
Kecskeméty, K.; Logachev, Yu. I.; Surova, G. M. +1 more
Data from the ULEIS instrument aboard the ACE spacecraft are used to study the energy spectra of 3He and 4He ions produced during periods of the quiet Sun in the 23rd solar cycle in the energy range ∼0.08-2 MeV/nucleon. Differences in the spectra and 3He/4He relative abundances for three groups of quiet …