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Infrared emission and the destruction of dust in HII regions
Wiebe, D. S.; Kirsanova, M. S.; Pavlyuchenkov, Ya. N.
The generation of infrared (IR) radiation and the observed IR-intensity distribution at wavelengths of 8, 24, and 100 µm in the ionized hydrogen region around a young, massive star is investigated. The evolution of the HII region is treated using a self-consistent chemical-dynamical model in which three dust populations are included—large silicate…
The interplanetary magnetic field: Radial and latitudinal dependences
Khabarova, O. V.
Results of the analysis of spacecraft measurements at 1-5.4 AU are presented within the scope of the large-scale interplanetary magnetic field (IMF) structure investigation. The work is focused on revealing of the radial IMF component ( B r ) variations with heliocentric distance and latitude as seen by Ulysses. It was found out that |…
Rotation of the Hyades derived from Hipparcos data
Vereshchagin, S. V.; Reva, V. G.; Chupina, N. V.
Data from the Hipparcos catalog are used to study the internal kinematics of the Hyades cluster. Cluster members whose proper motions and parallaxes are known with precisions not less than 5 mas/yr and 3 mas were used. The proper motions were reduced to the cluster center. A correlation between a component of the tangential velocity and the parall…
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 …