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jovian-explorer/README.md
Keshav Aggarwal, space physicist: solar wind, radio occultation, planetary plasma

Website Google Scholar: 2,078 citations ORCID ResearchGate
LinkedIn YouTube Medium Email

About

I am a space physicist working at the intersection of radio science, planetary science, space weather and data-driven research. I use spacecraft radio signals to study the solar corona, the solar wind, interplanetary plasma and planetary ionospheres. With observations from the Indian Mars Orbiter Mission, Chandrayaan-2, Chandrayaan-3, Akatsuki and Venus Express, I apply signal and time-series analysis to measure solar-wind speed, coronal electron density, plasma turbulence and the effects of space weather on planetary environments.

I submitted my PhD thesis, Exploring Space Weather and Its Effect on Planetary Atmospheres Using Radio Occultation, at IIT Indore in May 2026, supervised by Prof. Abhirup Datta and supported by the Prime Minister's Research Fellowship. I am now a student visitor at the Space Physics Laboratory, Vikram Sarabhai Space Centre (ISRO), Thiruvananthapuram.

Before that I built AI/ML and orbital-mechanics algorithms at ERETS Space London, and data pipelines for space-debris analysis at Armstrong Space Australia. That work pulled me towards space situational awareness, scientific software and making complex datasets easier to use.

At a glance

2,078

citations

9

h-index

26

publications

8

first-author papers

15

talks & posters

31

outreach videos

Honours

🏅 Prime Minister's Research Fellowship Ministry of Education, Government of India Jul 2023
🏆 Early Career Researcher Award, best poster 6th Indian Planetary Science Conference, IIT Roorkee Mar 2025
✈️ AGU Student Grant AGU Fall Meeting 2025, New Orleans Dec 2025
🛰️ ISpA Affiliate Member Indian Space Association Feb 2026

Research

Theme What I do Papers
☀️ Solar wind and corona Solar-wind speed and coronal density from the spectral broadening of spacecraft radio signals near solar conjunction (MOM S-band, Akatsuki X-band, across solar-activity levels). A turbulence-index-independent framework and a generalised Kolmogorov retrieval. ApJ 2025 · MNRAS 2025 · MNRAS 2026 · ASR 2026
🌌 Interplanetary medium Separating the interplanetary contribution from planetary radio-occultation signals using Chandrayaan-2, Chandrayaan-3, Venus Express and Akatsuki data. Icarus 2026
🌕 Lunar plasma environment Electron-density turbulence around the Moon from Chandrayaan-2 two-way radio science, comparing the solar wind with the terrestrial magnetotail. JGR: Planets 2026
🪐 Exoplanet atmospheres Member of the JWST Transiting Exoplanet Community ERS team: first JWST spectra of WASP-39b (CO₂, CO, photochemical SO₂), WASP-18b and WASP-43b. Nature 2023 · Nature 2023 · Nature 2024 · +6 more
🔭 Mission concepts Co-author on three white papers for the 2024–2033 Heliophysics Decadal Survey, including the COMPLETE flagship concept. BAAS 55(3)

Missions and data

Mission Agency Radio link Use
Mars Orbiter Mission ISRO S-band Coronal radio sounding at solar conjunction
Akatsuki JAXA X-band, one-way Solar-wind speed across solar-activity levels; interplanetary baseline
Chandrayaan-2 ISRO S-band, two-way Lunar plasma turbulence; lunar occultations
Chandrayaan-3 ISRO S-band, two-way Interplanetary fluctuations outside the lunar ionosphere
Venus Express ESA S/X-band, one-way Interplanetary-only baseline

Software

Public v0.1.0

Multi-mission planetary science laboratory: finds, downloads, processes and compares observations from NASA, ESA, JAXA and ISRO missions across the planets.

Python · Windows, macOS, Linux
DOI 10.5281/zenodo.23215291

COSMIC2 Explorer

In development

Desktop environment for COSMIC-2 GNSS radio-occultation profiles: retrieval, tropopause and ionosphere diagnostics, and comparison with other planetary atmospheres. Works offline.

Python · Windows, macOS, Linux

HELIOS-L1

In development

Space-weather suite for the Sun–Earth L1 fleet (DSCOVR, ACE, Aditya-L1, WIND, SOHO): solar-wind coupling, magnetopause and storm models, CME arrival estimates.

Python · Windows, macOS, Linux

Released code: RO-SPICE (radio-occultation geometry with NASA SPICE) · Akatsuki_open (Akatsuki open radio-science pre-processing) · Sun (MOM solar-wind speeds, ApJ 2025) · CO₂ in WASP-39b (figures for Nature 2023)

Toolbox

Python Jupyter NumPy SciPy Astropy SunPy Matplotlib NASA SPICE JWST pipelines Git

Selected first-author papers

  • A study on the contribution of the interplanetary medium in radio occultation experiments, Icarus (2026). doi
  • Plasma turbulence in the lunar environment across solar wind and magnetotail conditions: Observations from Chandrayaan-2 Radio Science experiment, JGR: Planets (2026). doi
  • A turbulence index independent framework for deriving solar wind speed and coronal electron density from radio spectral broadening, MNRAS (2026). doi
  • A generalized method for estimating solar wind speeds and densities using spectral broadening for a Kolmogorov turbulence spectrum, Advances in Space Research (2026). doi
  • On the estimation of solar wind velocity under varying solar activity conditions using Akatsuki measurements, MNRAS (2025). doi
  • Insights into solar wind flow speeds from the coronal radio occultation experiment: Findings from the Indian Mars Orbiter Mission, ApJ (2025). doi

➡️ Full list with search and filters: jovian-explorer.github.io/publications

Recent talks and posters

When Event Where
Mar 2026 🎤 7th Indian Planetary Science Conference (IPSC 2026) IIT Indore
Feb 2026 🎤 National Space Science Symposium (NSSS 2026) Umiam, Shillong
Jan 2026 🖼️ ISRO–ESA Workshop Thiruvananthapuram
Dec 2025 🖼️ AGU Fall Meeting 2025 · AGU Student Grant New Orleans, United States
Dec 2025 🖼️ The Variable Sun Thiruvananthapuram
Sep 2025 🖼️ ASI Symposium 003, Astronomical Society of India JECRC University, Jaipur

🎤 talk · 🖼️ poster · all of them on the talks page

Latest videos and writing

📺 Latest videos ✍️ Latest articles
Plasma Turbulence in Lunar Environment During Magnetotail Passage: Observations from Chandrayaan-2 Sep 2026 Is it Life, or is it Volcanoes? Oct 2023
A study on the contribution of the interplanetary medium in radio occultation experiments Sep 2026 India’s Lunar Triumphs and Solar Aspirations Oct 2023
A turbulence index independent framework for deriving solar wind speed and coronal electron density Sep 2026 OSIRIS-REx: A complete guide to the asteroid-sampling mission Sep 2023

In the media

Beyond research

  • 🔭 Outreach: public astronomy events, 31 lab videos and 12 classroom documents in English and Hindi, made with fellow students at IIT Indore
  • 📺 YouTube and ✍️ Medium: short explainers of my papers and space missions
  • 📷 Photography and 🗺️ travel: albums and maps from conferences and trips

jovian-explorer.github.io · CV · Research · Publications · Software · Talks

Numbers and lists refresh weekly from jovian-explorer.github.io. Citations from Google Scholar, Oct 2026.

Pinned Loading

  1. VEDA VEDA Public

    VEDA is an open, multi-mission planetary-science computational laboratory capable of discovering, downloading, processing, analyzing, visualizing, and comparing scientific observations across multi…

    Python 1

  2. Akatsuki_open Akatsuki_open Public

    Initial work on an open source pipeline to process Akatsuki open source data

    Jupyter Notebook

  3. RO-SPICE RO-SPICE Public

    Code to derive the geometries involved in a radio occultation experiment using NASA SPICE Toolkit

    Jupyter Notebook

  4. Eureka Eureka Public

    Forked from kevin218/Eureka

    Eureka! is a data reduction and analysis pipeline intended for time-series observations with the James Webb Space Telescope (JWST).

    Python 1 1