Mr. Sanjay Gosain Profile

Sanjay Gosain

Instrument Scientist at National Solar Observatory

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Publications (4)

Proceedings Article | 27 August 2022 Presentation + Paper

The compact Doppler magnetograph (CDM) for solar polar missions and space weather research

Donald Hassler, Sanjay Gosain, Jean-Pierre Wuelser, Thomas Woods, Steve Osterman, Joseph Alexander, Viliam Klein, Jack Harvey, Jeffrey Newmark, Doug Braun, Sarah Gibson, Ashley Flores, Rick Kohnert, Mark Phillips, Thomas Rose, Michael Shoffner, Han Uitenbroek, Joachim Woch, Junwei Zhao, Klaus Heerlein

Proceedings Volume 12180, 121800K (2022) https://doi.org/10.1117/12.2630663

KEYWORDS: Code division multiplexing, Doppler effect, Space operations, Magnetism, Optical filters, Calibration, Sun, Interferometers, Mirrors, Sensors

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Proceedings Article | 1 August 2021 Poster + Paper

Analysis of the space radiation effects on liquid crystal variable retarders

Marta Casti, Sanjay Gosain, Donald Hassler, Tom Baur, Brendan Michalicek, Jeffrey Newmark, Daniel Phipps, Nelson Reginald, Alyson Topper, Connor Wolenski, Jean-Pierre Wuelser

Proceedings Volume 11814, 118140P (2021) https://doi.org/10.1117/12.2599607

KEYWORDS: Liquid crystals, Wave plates, Space operations, Time metrology, Aerospace engineering, Modulation, Polarization, Gamma radiation, Remote sensing

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Proceedings Article | 6 July 2018 Paper

Design of a next generation synoptic solar observing network: solar physics research integrated network group (SPRING)

Sanjay Gosain, Frank Hill, Alexei Pevtsov, Valentin Pillet, Markus Roth, Michael Thompson

Proceedings Volume 10702, 107024H (2018) https://doi.org/10.1117/12.2306555

KEYWORDS: Magnetism, Telescopes, Solar processes, Iron, Doppler effect, Mirrors, Observatories, Sun, Signal to noise ratio, Space telescopes

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Long-term synoptic observations of the Sun in different wavelength regions are essential to understand its secular behavior. Such observations have proven very important for discovery of 11 year solar activity cycle, 22 year magnetic cycle, polar field reversals, Hale’s polarity law, Joy’s law, that helped Babcock and Leighton to propose famous solar dynamo model. In more recent decades, the societal impact of the secular changes in Sun’s output has been felt in terms of solar inputs to terrestrial climate-change and space-weather hazards. Further, it has been realized that to better understand the activity phenomena such as flares and coronal mass ejections (CMEs) one needs synoptic observations in multiple spectral lines to enable tomographic inference of physical parameters. Currently, there are both space and ground based synoptic observatories. However, given the requirements for the long-term stability and reliability of such synoptic datasets, ground-based facilities are more preferable. Also, the ground based observatories are easy to maintain or upgrade while detailed and frequent calibrations are easily possible. The only ground-based facility that currently provides full-disk velocity and magnetic field maps of the Sun around the clock and at good cadence, is the Global Oscillations Network Group (GONG) network of National Solar Observatory (NSO) which is operational since the mid 90s. Due to its aging instrumentation, operating for nearly three decades, and new requirements to obtain multiwavelength observations, a need is felt in the solar community to build a next generation synoptic observatory network. A group of international observatories have come together under the auspices of SOLARNET program, funded by European Union (EU), to carryout a preliminary design study of such a synoptic solar observing facility called “SPRING”, which stands for Solar Physics Research Integrated Network Group. In this article we will present concept of SPRING and the optical design concept of its major instruments.ts.

Proceedings Article | 26 September 2013 Paper

Solar chromosphere flare spectrograph

Debi Prasad Choudhary, Vasyl Yurchyshyn, Sanjay Gosain

Proceedings Volume 8862, 88620B (2013) https://doi.org/10.1117/12.2026776

KEYWORDS: Spectrographs, Magnetism, Observatories, Plasma, Cameras, Solar processes, Solar energy, Telescopes, Coronagraphy, Charge-coupled devices

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