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Observations on spatial variations of the Sr~{\sc i} 4607~Å~scattering polarization signals at different limb distances with ZIMPOL
Sajal Kumar Dhara, Emilia Capozzi, Daniel Gisler +5
The Sr~{\sc i} 4607~Å spectral line shows one of the strongest scattering polarization signals in the visible solar spectrum. The amplitude of this polarization signal is expected…
Spatial variations of the SrI 4607Åscattering polarization signals at subgranular scale observed with ZIMPOL at GREGOR telescope
Sajal Kumar Dhara, Emilia Capozzi, Daniel Gisler +5
Sr I 4607Åspectral line shows one of the strongest scattering polarization signals in the visible solar spectrum. The amplitudes of these signals are expected to vary at granular s…
Trigger of successive filament eruptions observed by SDO and STEREO
Sajal Kumar Dhara, Ravindra B., Pankaj Kumar +3
Using multi-wavelength observation from SDO and STEREO, we investigated the mechanism of two successive eruptions (F1 & F2) of a filament in active region NOAA 11444 on 27 march, 2…
Formation and eruption of a flux rope from the sigmoid active region NOAA 11719 and associated M6.5 flare: A multi-wavelength study
Bhuwan Joshi, Upendra Kushwaha, Astrid M. Veronig +3
We investigate the formation, activation and eruption of a flux rope from the sigmoid active region NOAA 11719 by analyzing E(UV), X-ray and radio measurements. During the pre-erup…
Fabry-Pérot based Narrow Band Imager for Solar Filament Observations
Sajal Kumar Dhara, B. Ravindra, Ravinder Kumar Banyal
We have recently developed a narrow band imager (NBI) using an air gap based Fabry-Pérot (FP) interferometer at the Indian Institute of Astrophysics, Bangalore. Narrow band imaging…
Observations of Photospheric Vortical Motions During the Early Stage of Filament Eruption
Sajal Kumar Dhara, B. Ravindra, Ravinder Kumar Banyal
Solar filaments/prominences exhibit rotational motion during different phases of their evolution from their formation to eruption. We have observed the rotational/vortical motion i…
Filament eruption in association with rotational motion near the filament footpoints
Sajal Kumar Dhara, B. Ravindra, Ravinder Kumar Banyal
The active region magnetic field surrounding the filament plays an important role in filament formation, their evolution and disruption. We investigated a filament eruption that oc…