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Hello, I am Sarvesh

Sarvesh Mangla

Research Scholar at Indian Institute of Technology Indore

I am passionate about Astronomy since early childhood. Now, I am, pursuing a doctorate in Astronomy at the Indian Institute of Technology Indore.
When I’m not studying, I enjoy learning new techniques in Python. Another pastime is Project Euler. When I’m not being productive with my time, I like to read Novels or watch film and series. Sometimes, very occasionally make bad acrylic painting.

Team Work
Hard Working



The Common Astronomy Software Applications (CASA) package, is the primary data processing software for the radio telescopes like VLA, GMRT, ALMA.


SPAM is a Python-based extension to AIPS, aimed at reducing high-resolution, low-frequency radio interferometric observations in a very efficient, systematic and reproducible way. Special features in SPAM, like direction-dependent ionospheric calibration and image-plane ripple suppression, will help to make high-quality sub-GHz images.


Department of Astronomy, Astrophysics and Space Engineering (DAASE), Indian Institute of Technology Indore (IIT Indore)

July 2018 - July 2023, Indore, Madhya Pradesh, India

IIT Indore is devoted to excellence in teaching, learning, and research, and to developing leaders in many disciplines who make a difference globally. DAASE is a unique department among all IITs that offers a dedicated and focused platform to pursue research in Astronomy and space sciences.
Supervisor: Abhirup Datta
Thesis Title: Probing low-latitude Ionosphere using the Giant Metrewave Radio Telescope

Senior Research Fellow (UGC-SRF)

June 2021 - July 2023

  • Mentored two undergraduate students for Summer Internship on Ionosphere study with GPS based measurements
Junior Research Fellow (UGC-JRF)

July 2018 - June 2021

  • Tutorial in Radio astronomy data analysis for Master’s students
    (Course- AA 474/674N - Basics of Radio Astronomy) Youtube Link
  • Mentored an undergraduate intern under TEQIP for project on detecting ionospheric variations using FFT
  • Teaching Assistant at IIT Indore in MSc Astronomy Laboratory-I
    (AA 651, Autumn semester)
  • Teaching Assistant at IIT Indore in MSc Astronomy Laboratory-II
    (AA 652 Optics, Spring semester)

Junior Research Fellow
LASTEC, Defence Research and Development Organisation (DRDO)

Jan 2018 - July 2018, New-Delhi, India

The DRDO is the premier agency under the Department of Defence Research and Development in Ministry of Defence of the Government of India, charged with the military’s research and development, headquartered in Delhi, India.

  • Build simulation for “Beam Quality for Multiple Beams using Spectral Beam Combining.”
  • Learned an optical designing software called OSLO.

Subject Physics Expert
Chegg India

Sept 2015 - Dec 2017,

  • Worked as a Freelancer


The spectral study of the faint radio sources in the ELAIS N1 field

Understanding the spectral properties of sources is crucial for the characterization of the radio source population. In this work, we have extensively studied the ELAIS N1 field using various low-frequency radio observations. For the first time, we present the 1250 MHz observations of the field using the upgraded Giant Meterwave Radio Telescope (uGMRT) that reach a central off-source RMS noise of ∼12 μJy/beam. A source catalogue of 1086 sources is compiled at 5 sigma threshold (>60μJy) to derive the normalized differential source counts at this frequency that is consistent with existing observations and simulations. We present the spectral indices derived in two ways; two-point spectral indices and by fitting a power-law. The latter yielded a median α=−0.57±0.14, and we identified nine ultra-steep spectrum sources using these spectral indices. Further, using a radio colour diagram, we identify the three mega-hertz peaked spectrum (MPS) sources, while three other MPS sources are identified from the visual inspection of the spectra, the properties of which are discussed. In our study of the classified sources in the ELAIS N1 field, we present the relationship between α and z. We find no evidence of an inverse correlation between these two quantities and suggest that the nature of the radio spectrum remains independent of the large-scale properties of the galaxies that vary with redshifts.

Spectral Analysis of Ionospheric Density Variations Measured With the Large Radio Telescope in the Low-Latitude Region

The low-latitude ionosphere is a dynamic region with a wide range of disturbances in temporal and spatial scales. The Giant Metrewave Radio Telescope (GMRT) situated in the low-latitude region has demonstrated its ability to detect various ionospheric phenomena. It can detect total electron content (TEC) variation with precision of 1.0 mTECU and also can measure TEC gradient with an accuracy of about 0.7 mTECU/km. This paper describes the spectral analysis of previously calculated TEC gradient measurements and validates them by comparing their properties using two bands. The analysis tracked individual waves associated with medium-scale traveling ionospheric disturbances (MSTIDs) and smaller waves down to wavelengths of ∼10 km. The ionosphere is found to have unanticipated changes during sunrise hours, with waves changed propagation direction as the sun approached the zenith. Equatorial spread F disturbances during sunrise hours is observed, along with smaller structures moving in the same direction.

Exploring equatorial ionosphere using the GMRT

Exploring Earth’s Ionosphere and its effect on low radio frequency observation with the uGMRT and the SKA

The Earth’s ionosphere introduces systematic effects that limit the performance of a radio interferometer at low frequencies (≲ 1 GHz). These effects become more pronounced for severe geomagnetic activities or observations involving longer baselines of the interferometer. The uGMRT, a pathfinder for the Square Kilometre Array (SKA), is located in between the northern crest of the Equatorial Ionisation Anomaly (EIA) and the magnetic equator. Hence, this telescope is more prone to severe ionospheric conditions and is a unique radio interferometer for studying the ionosphere. Here, we present 235 MHz observations with the GMRT, showing significant ionospheric activities over a solar minimum. In this work, we have characterised the ionospheric disturbances observed with the GMRT and compared them with ionospheric studies and observations with other telescopes like the VLA, MWA and LOFAR situated at different magnetic latitudes. We have estimated the ionospheric total electron content (TEC) gradient over the full GMRT array which shows an order of magnitude higher sensitivity compared to the Global Navigation Satellite System (GNSS). Furthermore, this article uses the ionospheric characteristics estimated from the observations with uGMRT, VLA, LOFAR and MWA to forecast the effects on the low-frequency observations with the SKA1-MID and SKA1-LOW in future.

Probing equatorial ionosphere using GMRT at sub-GHz frequencies

Study of the equatorial ionosphere using the Giant Metrewave Radio Telescope (GMRT) at sub-GHz frequencies

Radio interferometers, which are designed to observe astrophysical objects in the universe, can also be used to study the Earth’s ionosphere. Radio interferometers like the Giant Metrewave Radio Telescope (GMRT) detect variations in ionospheric total electron content (TEC) on a much wider spatial scale at a relatively higher sensitivity than traditional ionospheric probes like the Global Navigation Satellite System (GNSS). The hybrid configuration of the GMRT (compact core and extended arms) and its geographical location make this interferometer an excellent candidate to explore the sensitive regions between the northern crest of the Equatorial Ionization Anomaly (EIA) and the magnetic equator. For this work, a bright radio source, 3C 68.2, is observed from post-midnight to post-sunrise (∼ 9 h) to study the ionospheric activities at solar-minima. This study presents data reduction and processing techniques to measure differential TEC (⁠δTEC⁠) between the set of antennas with an accuracy of 1.0 mTECU. Furthermore, using these δTEC measurements, we have demonstrated techniques to compute the TEC gradient over the full array and micro-scale variation in 2D TEC gradient surface. These variations are well equipped to probe ionospheric plasma, especially during the night-time. Our study, for the first time, reports the capability of the GMRT to detect ionospheric activities. Our result validates, compared to previous studies with VLA, LOFAR, and MWA, the ionosphere over the GMRT is more active, which is expected due to its location near the magnetic equator.

Characterizing travelling ionosphere disturbances (TIDs) using Giant Metrewave Radio Telescope (GMRT)
AGU Fall Meeting 2021 13-17 December 2021

Spectral analysis of ionospheric TEC gradients observed with the Giant Metrewave Radio Telescope at sub-GHz frequencies
AGU Fall Meeting 2020 1-17 December 2020

Constraining Equatorial Ionosphere using the Giant Meterwave Radio Telescope (GMRT)


M.Sc. in Physics with specialization in Astronomy
Taken Courses
  • Astronomy and Astrophysics
  • Mathematical Methods in Physics
  • Methods of Computational Physics
  • Classical Mechanics
  • Statiscal Mechanics
  • Quantum Mechanics
  • Electronics
  • Electrodynamics
  • Solid State Physics
  • Nuclear Physics
B.Sc. (H) in Physics
Senior School Certificate
Secondary School Certificate