Understanding the solar corona requires knowledge of its dynamics through various layers and subsequent connectivity to heliosphere. This understanding nature outflows physical transitions middle (~1.5-6.0 Rs). While this region is still inaccessible in situ measurements, remote sensing observations are available, but their interpretation can be controversial due line-of-sight effects non-radia...

As regards of supper efficiency models which increased the discrimination power of the standard DEA models, still infeasibility may occure. In literature there exists some models overcome this difficulty. In this paper a new procedure has been mooted in order to remove this shortcoming in a way that both input savings and output surplus are being considered. This procedure deals with nonradial ...

Received ; accepted – 2 – ABSTRACT We have studied the photometric variability of ten SMC Be/X-ray pulsars using MACHO and OGLE-II data. For some of these systems we have found periodic behavior, including orbital outbursts and/or nonradial pulsations (NRP) of the Be star. For others we were unable to identify any clear photometric periodicity, although their longterm light curves show signific...

We discuss the results of a systematic search for multi-periodic pulsations in Galactic Bulge δ Scuti and RR Lyrae stars. Six " normal " double-mode variables pulsating in two radial modes have been identified (5 δ Scuti-type and 1 RR Lyrae-type). In 37 RR Lyrae stars secondary periodicities very close to the primary pulsation frequency have been detected. These periodicities correspond to nonr...