X-Ray Spectrometers On-Board Aditya-L1 for Solar Flare Studies

Sankarasubramanian, K.; Sudhakar, M.; Nandi, Anuj; Ramadevi, M. C.; Adoni, Abhijit A.; Kushwaha, Ankur; Agarwal, Anchal; Dey, Arjun; Joshi, Bhuwan; Singh, Brajpal; Girish, V.; Tomar, Ishan; Majhi, Kamal Kumar; Kumar, Dilip; Olekar, Manjunath; Bug, Monoj; Pala, Manohar; Thakur, Mukund Kumar; Badagandi, Rajeev R.; Ravishankar, B. T.; Garg, Sarthak; Sitaramamurthy, N.; Sridhara, N.; Umapathy, C. N.; Gupta, Vinod K.; Agrawal, Vivek; Yougandar, B.

doi:10.18520/cs/v113/i04/625-627

Cited by 13 publications

(4 citation statements)

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“…The Aditya-L1 mission has two full-Sun integrated X-ray spectrometers (Sankarasubramanian et al 2017), viz. the Solar Low Energy X-ray Spectrometer (SoLEXS) and High Energy L1 Orbiting X-ray Spectrometer (HEL1OS) with their primary goal of studying solar flares.…”

Section: X-ray Observations Of the Sun With Aditya-l1mentioning

confidence: 99%

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The Aditya-L1 mission of ISRO

Tripathi,

Chakrabarty,

Nandi

et al. 2022

Proc. IAU

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The Aditya-L1 is the first space-based solar observatory of the Indian Space Research Organization (ISRO). The spacecraft will carry seven payloads providing uninterrupted observations of the Sun from the first Lagrangian point. Aditya-L1 comprises four remote sensing instruments, viz. a coronagraph observing in visible and infrared, a full disk imager in Near Ultra-Violet (NUV), and two full-sun integrated spectrometers in soft X-ray and hard X-ray. In addition, there are three instruments for in-situ measurements, including a magnetometer, to study the magnetic field variations during energetic events. Aditya-L1 is truly a mission for multi-messenger solar astronomy from space that will provide comprehensive observations of the Sun across the electromagnetic spectrum and in-situ measurements in a broad range of energy, including magnetic field measurements at L1.

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Section: X-ray Observations Of the Sun With Aditya-l1mentioning

confidence: 99%

“…The CdTe detector is sensitive from 10 to 40 keV and will be used for detailed spectroscopic studies. For further details of SoLEXS and HEL1OS, see Sankarasubramanian et al (2017).…”

Section: X-ray Observations Of the Sun With Aditya-l1mentioning

confidence: 99%

The Aditya-L1 mission of ISRO

Tripathi,

Chakrabarty,

Nandi

et al. 2022

Proc. IAU

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“…Another compact X-ray spectrometer utilizing SDDs will be SoLEXS (Sankarasubramanian et al, 2017), which will be launched on the Indian Aditya-L1 spacecraft in 2022. Two SDDs will be used with apertures of different sizes in order to observe both large and small flares.…”

Section: Silicon Pin and Drift Detectorsmentioning

confidence: 99%

Future Prospects for Solar EUV and Soft X-Ray Spectroscopy Missions

Young

2021

Front. Astron. Space Sci.

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Future prospects for solar spectroscopy missions operating in the extreme ultraviolet (EUV) and soft X-ray (SXR) wavelength ranges, 1.2–1,600 Å, are discussed. NASA is the major funder of Solar Physics missions, and brief summaries of the opportunities for mission development under NASA are given. Upcoming major solar missions from other nations are also described. The methods of observing the Sun in the two wavelength ranges are summarized with a discussion of spectrometer types, imaging techniques and detector options. The major spectral features in the EUV and SXR regions are identified, and then the upcoming instruments and concepts are summarized. The instruments range from large spectrometers on dedicated missions, to tiny, low-cost CubeSats launched through rideshare opportunities.

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“…This necessitates developing on-board decision making intelligence to automatically detect a flare and find its location when it happens on the solar disk, and accordingly define the RoI, in real-time. To identify a flare, SUIT makes use of real time data from two other X-ray payloads, namely Solar Low Energy X-ray spectrometer (SOLEXS) and High Energy L1 orbiting X-ray Spectrometer (HEL1OS) onboard the same observatory, Aditya L1 (Sankarasubramanian et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Solar Ultra-Violet Imaging Telescope: On-board intelligence for flare observations

Varma

Padinhatteri

Sinha

et al. 2022

Preprint

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Aditya-L1 is India’s first observatory class Solar space mission to study the Sun from Lagrangian 1 position. The Solar Ultra-Violet Imaging Telescope (SUIT) is one of the payloads on-board Aditya-L1. SUIT is an off-axis Ritchey-Chretien (RC) telescope, which images the Sun on to a 4k x 4k CCD covering a field-of-view of 1.5Ro with a plate scale of 0.7'/pixel. One of the primary objectives of SUIT is to study the early evolution of solar flares with high time cadence in Near UV wavelength (200 nm – 400 nm). The SUIT on-board intelligence is developed to achieve this objective. The complete intelligence algorithm is divided into several sub-modules each working on a specific aspect of intelligence. These are, HEL1OS flare trigger module: generates flare trigger using HEL1OS hard X-ray data, flare localization module: locates flare on the SUIT full-disc images, Region of Interest (RoI) tracking module: accounts for shift in RoI coordinates caused due to rotation of the Sun, auto-exposure control module: adjusts the exposure time depending upon the flare intensity for better contrast. In this paper, these on-board intelligence modules are explained in detail. The working principles of these modules are tested using available data from various existing missions and also using synthesized data and the obtained results are presented. The modules are implemented in hardware using Actel RTAX 2000S FPGA and are tested using laboratory setup. From the testing, it is found that, flares are successfully localized in a mean time of 40 seconds from the GOES soft X-ray catalog start time. Also, a time cadence of under 3 seconds for a single filter flare RoI images is achieved.

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X-Ray Spectrometers On-Board Aditya-L1 for Solar Flare Studies

Cited by 13 publications

References 0 publications

The Aditya-L1 mission of ISRO

The Aditya-L1 mission of ISRO

Future Prospects for Solar EUV and Soft X-Ray Spectroscopy Missions

The Solar Ultra-Violet Imaging Telescope: On-board intelligence for flare observations

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