Background & Aims of the Study: Due to widespread dust-storms in the western regions of Iran and the significant role of meteorological parameters in formation and control of these storms, this study aimed to explore the correlation between meteorological parameters and dust-storm occurrences in the western part of Iran. Materials & Methods: In this cross-sectional study, meteorological param...

In order to recognize the wind erosion situation of a region, the survey of its windiness is not sufficient and the physical characteristics of earth are of importance too. In fact, the outbreak of dust storms in a region is due to the sensitivity of earth and domination of wind in that region. In this investigation we have tried to find a way for determining the regions in which a dust storm i...

Dust plays an increasingly important role in astrophysics. Historically, dust was first recognized for its obscuring effects, and the need to correct observed intensities for attenuation by dust continues today. But with the increasing sensitivity of IR, FIR, and submm telescopes, dust is increasingly important as a diagnostic, with its emission spectrum providing an indicator of physical condi...

Context. Dust properties are very likely affected by the environment in which dust grains evolve. For instance, some analyses of cold clumps (7 K17 K) indicate that the aggregation process is favored in dense environments. However, studying warm (30 K-40 K) dust emission at long wavelength (λ>300 μm) has been limited because it is difficult to combine far infrared-to-millimeter (FIR-to-mm) spec...

Aims. NGC 1530 has one of the strongest bars ever observed and recent star formation sites are distributed across its bar. Our aim is to study the photometric properties of the bar and its H ii regions, to elucidate the conditions under which H ii regions form and their spatial relation to the principal dynamical features of the bar. Methods. We obtained BVRKs and Hα photometry of the H ii regi...