Sanjay Gosain Email & Phone Number

Tucson, Arizona Area

My research experience at NSO:- I am involved in the calibration of SOLIS VSM spectropolarimetric observations.Also, more recently I am involved in the design, development and calibration of a new Liquid Crystal based Modulator for Ca II 854.2 nm chromospheric observations, planned in near future. - I have been involved in the study of Solar Magnetic Fields using SOLIS, NSOKP, GONG, Hinode SP, and HMI observations. - I have initiated the development of Carrington Maps of the Vector Magnetic Field using SOLIS fulldisk Vector Magnetograms. These are first such data products which are providing us new information about nature of solar magnetic fields.Some publications resulting from these new maps are: 1. First synoptic maps of photospheric vector magnetic field from SOLIS/VSM: Non-radial magnetic fields and hemispheric pattern of helicityS Gosain, AA Pevtsov, GV Rudenko, SA AnfinogentovThe Astrophysical Journal 772 (1), 52, 20132. First use of synoptic vector magnetograms for global nonlinear force free coronal magnetic field modelsT Tadesse, T Wiegelmann, S Gosain, P MacNeice, AA PevtsovAstronomy & Astrophysics,562, A105, 20143. Global Solar Free Magnetic Energy and Electric Current Density Distribution of Carrington Rotation 2124T Tadesse, T Wiegelmann, PA Alexei, P Macneice, S GosainSolar Physics, 289, 4031, 20144. Hemispheric Distribution of Subsurface Kinetic Helicity and Its Variation with Magnetic ActivityR Komm, S Gosain, AA PevtsovSolar Physics 289 (7), 2399-2418, 20145. Current and Kinetic Helicity of Long-lived Activity ComplexesR Komm and S GosainThe Astrophysical Journal 798, 20, 2015

Udaipur Solar Observatory

After my Masters in Physics I did Associateship at PRL, Ahmedabad and later joined USO, Udaipur as Staff ScientistResearch experience at USO/PRL: (A) Developed a Solar Vector Magnetograph (SVM) instrument as a part of my Ph.D. thesis work on "Polarimetric studies of Solar Atmosphere". It got Best Thesis award by Astronomical Society of India. Thesis supervisors: Prof. P. Venkatakrishnan and Prof. K. Venugopalan(B) Participated in Solar Eclipse Expeditions, Contributed to development of instrumentation and data analysis.(i) Lusaka, Zambia 2001(ii) Guanzhou, China, 2009(C) Published Research on Flare/Eruptive Phenomena in various International Journals.Noteable Results:- Discovery of Coherent Lateral motion of penumbral filaments during X-class flare (ApJ. L240, 706, 2009) - Discovery of systematic changes in the Dip-shear angle in active regions during flare interval (ApJ, L137, 720, 2010)(D) Participated in Indo-French collaborative project, - Observed with THEMIS telescope at Canary Islands.- Worked on Filament eruptions using ground and STEREO satellite data.- Developed methods for stereoscopic reconstruction.(E) Other miscellaneous activities- Installation of Two-mirror siderostat- Installation of Benchtop Littrow spectrograph for calibration of FP Etalon- Development of Control software for Fabry-Perot, polarimeter and CCD modules. - Installation of SVM-I and SVM-II on G-E mounts in enclosed domes - Development of GUI and automation of H-alpha observing CCD software at USO- Development of webcam based solar guider system.- Development of Data reduction and analysis pipeline for SVM data- Development of GUI Tools for interactive Stokes-Inversion (ME and LTE based) of SVM data.- Development of GUI Tools for visualization and transformations of inverted vector magnetograms. - Contributed to development of Optics Laboratory. - Trained Summer Students in Astronomical Instrumentation.

Doctor Of Philosophy (Ph.D.), Physics

Thesis title: "Polarimetric Studies of the Solar Atmosphere" Supervisors: Prof. P. Venkatakrishnan and Prof. K. Venugopalan Recognitions.

Ms, Physics

Sr. Secondary School