1. Institute of Solar-Terrestrial Physics, Irkutsk 664033, Russia
2. Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India
3. Aryabhatta Research Institute of Observational Sciences, Nainital 263000, Uttarakhand, India
4. Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
5. Crimean Astrophysical Observatory, Nauchny 298409, Bakhchisaray, Republic of Crimea