Scientists at the Indian Institute of Astrophysics combined Aditya-L1's Visible Emission Line Coronagraph data with NASA Solar Dynamics Observatory imagery to demonstrate that a coronal mass ejection on 5 August 2024 did not expand as a symmetric bubble, a finding published in The Astrophysical Journal Letters that could refine arrival-time predictions for Earth-directed solar storms.
Why asymmetry matters
Space weather operators traditionally model eruptions as uniform shells moving through the solar wind. When plasma expands unevenly, drag and speed change in ways that simple cones miss. India's coronagraph captured Doppler-shifted emission on opposite sides of the line of sight simultaneously, signalling material moving toward and away from the observer while SDO tracked the front in plane-of-sky images.
Modeling work at IIA Bengaluru
Researchers built a three-dimensional geometric model of the shell, tuning tilt and lateral expansion rates until synthetic spectra matched VELC observations. Symmetric expansion failed the fit; skewed lateral growth reproduced the data. The institute, an autonomous body under the Department of Science and Technology, noted that Indians now contribute native instruments at the Lagrange point rather than relying solely on overseas coronagraphs for storm post-mortems.
Mission context
Aditya-L1 reached its halo orbit around Sun-Earth Lagrange Point 1 in January 2024, giving continuous views without Earth eclipses. November 2026 marks ongoing operations for the Solar Ultraviolet Imaging Telescope and coronagraph suite while ISRO's ground team also celebrates the healthy NVS-03 navigation satellite after October's GSLV launch.
Downstream uses
Improved near-Sun geometry feeds into Indian Space Weather Obervatory alerts that protect power grids and satellite operators. Commercial launch planners tracking radiation belts also ingest IIA refinements when scheduling communication satellite fuelling.
The paper is narrowly focused on one eruption, yet it advertises what Aditya-L1 was built to do: supply Indian-led datasets that survive peer review beside legacy US and European missions. More events will need similar treatment before forecasters trust asymmetry as a default knob, but the August 2024 case offers a concrete template.
Instrument performance
The Visible Emission Line Coronagraph survived thermal cycles beyond its qualification matrix, according to Indian Space Research Organisation updates coinciding with the paper's release. Stable pointing allowed multi-hour exposures that would have been impossible from ground-based observatories during monsoon cloud cover.
Future Aditya data releases will pair with Indian Institute of Science magnetohydrodynamic simulations to test whether asymmetric shells change geomagnetic storm intensity. Power grid operators want probabilistic forecasts at least six hours before impact; asymmetric corrections may buy an extra hour of lead time in some scenarios.
Training pipeline
Graduate students at IIA Bengaluru incorporated the August 2024 event into coursework on spectral inversion, expanding India's domestic talent pool for space weather careers. Collaboration agreements with NASA's Solar Dynamics Observatory team continue for joint data pulls on the next strong flare season.