Using methods of differential evolution (DE,) we determined the coronal elemental abundances and emission measure (DEM) distributions for plasma flaring on 2003 January 21. The analyses have been based RESIK X-ray spectra. DE belongs to family evolutionary algorithms. is conceptually simple easy be implemented, so it has applied solve many problems in science engineering. In this study apply me...

The first self-consistent three-dimensional magnetohydrodynamical simulations of convergingmagnetic flux events associated with the formation of coronal X-ray bright points are presented. The initial magnetic field results from two magnetic dipoles located below the photosphere at positions r1 and r2, respectively, and an additional horizontal magnetic field parallel to the line r1r2. Both dipo...

We report XMM-Newton observations of the eclipsing binary Algol A (B8V) and B (K2III). The XMM-Newton data cover the phase interval 0.35 – 0.58, i.e., specifically the time of optical secondary minimum, when the X-ray dark B-type star occults a major fraction of the X-ray bright K-type star. During the eclipse a flare was observed with complete light curve coverage. The decay part of the flare ...

It has been proposed that flares in the solar corona may well be a result of an internal self-organized critical (SOC) process in active regions. We have developed a cellular automaton SOC model that simulates flaring activity extending over an active subflaring background. In the resulting frequency distributions we obtain two distinct power laws. That of the weaker events is shorter and much ...

We present results revealing microwave pulsations produced in a model of flaring twisted solar coronal loop, without any external oscillatory driver. Two types oscillations are identified: slowly-decaying with period about 70-75s and amplitude 5-10% seen loops both energetic electrons, 40s few tens percent observed only electrons for 100s after onset fast energy release. interpret the longer-pe...

Abstract Habitability of an exoplanet is believed to be profoundly affected by activities the host stars, although related coronal mass ejections (CMEs) are still rarely detected in solar-like and late-type stars. We here report observational study on flares two M dwarfs triggered high-cadence survey performed Ground-based Wide Angle Camera system. In both events, fast, time-resolved spectrosco...

We report on XMM–Newton observations of the young open cluster NGC 2547 which allow us to characterize coronal activity in solar-type stars, and stars of lower mass, at an age of 30 Myr. X-ray emission is seen from stars at all spectral types, peaking among G stars at luminosities (0.3–3 keV) of L x 1030.5 erg s−1 and declining to L x 1029.0 erg s−1 among M stars with masses 0.2 M . Coronal spe...

We have produced annual estimates of national and global gas flaring and gas flaring efficiency from 1994 through 2008 using low light imaging data acquired by the Defense Meteorological Satellite Program (DMSP). Gas flaring is a widely used practice for the disposal of associated gas in oil production and processing facilities where there is insufficient infrastructure for utilization of the g...