India's Sun Mission: Aditya-L1 Set To Enter Final Orbit Today

The final destination orbit of Indian Space Research Organisation's Aditya-L1, India's first sun-studying mission, is set to be reached on Saturday, over four months since its ambitious journey began from ISRO's Sriharikota launchpad. At a cost of ₹400 crore, the nearly 1,500 kg satellite, functioning as the first space-based Indian observatory for sun study, will be positioned in a halo orbit around Lagrange point 1 (L1) at approximately 4 pm.

The advantageous L1 position ensures continuous viewing of the Sun without hindrance from eclipses and was chosen for the final insertion. An ISRO official informed PTI that this manoeuvre, scheduled for around 4 pm on Saturday, will bind Aditya-L1 to the halo orbit around L1, preventing a potential continuation towards the Sun if not performed.

The changing space weather, encompassing potential adverse impacts such as solar storms and flares affecting satellite operations, will be monitored by the space observatory. Solar storms, characterized as large-scale magnetic eruptions on the Sun with the potential to impact the entire solar system, will be a focus of observation.

Continuous observation of the Sun by Aditya-L1 will provide early warnings of imminent solar electromagnetic effects on Earth. This capability enables the protection of satellites, power electrical systems, and communication networks, allowing the continuation of normal operations by implementing safe modes during solar storms, said ISRO Chairman, S Somanath, while speaking to NDTV.

The significance of safeguarding India's assets in space, valued at over ₹50,000 crores and comprising over 50 operational satellites, against potential disruptions from solar activity was emphasized by Mr. Somnath. In the event of solar storms, these assets will operate in safe modes to mitigate disruptions.

Carrying seven payloads, Aditya-L1 will conduct scientific experiments aimed at enhancing understanding of the photosphere, chromosphere, and the outermost layers of the Sun (the corona) using electromagnetic, particle, and magnetic field detectors. In addition to studying solar weather, crucial information about pre-flare and flare activities and the dynamics of space weather will be gained by the satellite.

According to ISRO, these are the major scientific objectives of Aditya-L1 mission:

• Study of solar upper atmospheric (chromosphere and corona) dynamics
• Investigation into chromospheric and coronal heating, exploring the physics of partially ionized plasma, initiation of coronal mass ejections, and flares
• Observation of in-situ particle and plasma environment, contributing data for the study of particle dynamics originating from the Sun
• Examination of the physics of solar corona and its heating mechanism
• Diagnostics of coronal and coronal loops plasma, including temperature, velocity, and density
• Exploration of the development, dynamics, and origin of Coronal Mass Ejections (CME)
• Identification of the sequence of processes occurring at multiple layers (chromosphere, base, and extended corona) leading to solar eruptive events
• Analysis of magnetic field topology and magnetic field measurements in the solar corona
• Investigation into the origin, composition, and dynamics of solar wind, understanding the drivers for space weather