Search Publications
Prolonged, Weak C1.2 Flares: A Source of Protons and Electrons
Struminskii, A. B.; Grigor'eva, I. Yu.; Shakhovskaya, A. N.
Two proton events (>100 MeV; GOES, ACS SPI) associated with weak flares (C1.2, GOES class) in the soft X-ray range that occurred on November 26, 2011, and September 29, 2013, are analyzed. These events were accompanied by significant fluxes of relativistic electrons (>1 MeV; SOHO EPHIN) in the interplanetary space. The time profiles of these…
Variations in Ion-Component Pressure during Dipolarization in the Near-Earth Magnetotail Plasma Sheet
Malykhin, A. Yu.; Grigorenko, E. E.; Kronberg, E. A. +1 more
The dynamics of fluxes of thermal and suprathermal H+ and O+ ions and the pressure variations of these components during 11 events of magnetic field dipolarization in the plasma sheet of the geomagnetic tail are analyzed based on Cluster satellite observations. It was found that the energy of H+ and O+ i…
Long-term Activity in Photospheres of Low-mass Stars with Strong Magnetic Fields
Bondar', N. I.; Katsova, M. M.
The behavior of the average annual luminosity of K–M dwarfs OU Gem, EQ Vir, V1005 Ori and AU Mic was studied at time intervals of several decades. The main sources of photometric data for 1989–2019 were the Hipparcos, ASAS, KWS databases. An analysis of long-term series showed that the average annual brightness of all stars varies cyclical. The du…
Formation and Evolutionary Changes of Coronal Holes in the Growth Phase of Cycle 23
Bilenko, I. A.; Tavastsherna, K. S.
The regularities in the formation of coronal holes in the growth phase of cycle 23 are studied. The period from January 1, 1997, to March 1, 2000 (Carrington rotations 1918–2059), is considered in detail. The evolution of the global magnetic field of the Sun from a zonal to a sectorial structure of the field distribution is analyzed. The zonal str…
Features of Slow Sunspot Dissipation
Solov'ev, A. A.; Zhivanovich, I.
According to a model of sunspot dissipation through a thin boundary layer between the sunspot magnetic flux tube and the surrounding medium, the rate of decrease in the sunspot area must slow as the spot size decreases until it reaches a critical threshold at which the linear law of sunspot dissipation gives way to a nonlinear one. This theoretica…
Search for the Relationship between the Velocity of a Coronal Mass Ejection and the Decay Rate of the Magnetic Field in the Region of Mass Emission Generation
Fainshtein, V. G.; Rudenko, G. V.; Zagainova, Yu. S.
In this paper, we search for the relationship between the Vlin linear projection velocity and the Vss velocity in the 3D space of coronal mass ejections (CMEs) recorded by LASCO coronagraphs with an "n" decay rate of the transverse component of the Bt magnetic field above the polarity inversion line (PIL) of the ph…