May 17, 2022
A comprehensive study of multi-wavelength flux and spectral variability of
HBL 1ES 1959+650 using observations from AstroSat, Neil Gehrels Observatory Swift,
Fermi, FACT. The AstroSat observations are unique in terms of revealing the entirety of
two small time-scale flaring state which is part of a larger time-scale variation. The
time-resolved SEDs and lightcurves are modeled to extract the plasma micro-
physics and to parameterize the shock accelerations.
The IBL S5 0716+714 was caught displaying a clear 360 degree rotation of optical position vector angle
during a historic flare in January 2015. The fractional optical polarization showed very fast but
highly erratic variations throughout the activity. The SED, lightcurves and polarization was modeled
using 'Helical Magnetic Field Jet' model developed by Dr. Haocheng Zhang. Our work clearly indicate
the change of magnetic field morphology (poloidal -> toroidal -> poloidal) during the passage of shock
through the emission region.
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