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ISRO successfully places Aditya L1 in orbit

As the Chandrayaan-3 lander and rover continue to collect data on the Moon, the Indian Space Research Organisation (ISRO) on Saturday successfully launched the observatory that will study the Sun from 1.5 million kilometres away. It took nearly 63 minutes for one of the heaviest configurations of the PSLV to place the spacecraft in a precise elliptical orbit of nearly 235 km x 19,500 km.

The mission will travel 1.5 million kilometres to study the earth’s closest star over the course of five years. The spacecraft — the first space-based Indian observatory to study the Sun — would be launched by PSLV-C57 rocket. This mission is a collaboration between ISRO and several esteemed institutions.

Mission Director Biju S R added: “The orbital requirements given by the satellite team were very challenging. We have gone for a new mission descent strategy. We have gone through numerous simulations to validate this and this is the proof. With this, the capability of PSLV has increased manifold to venture into new and challenging missions.”

External Affairs Minister (EAM) S Jaishankar on Saturday congratulated the Indian Space Research Organisation (ISRO) on the successful launch of India’s first solar mission, Aditya -L1, calling it another feather in the space agency’s cap.

S Somanath said the spacecraft was injected in the "precise orbit". "Aditya L1 spacecraft has been injected in an elliptical orbit of 235 by 19,500 km which is intended, very precisely by the PSLV," he said.

Aditya-L1 spacecraft's trajectory involves several phases, beginning with its placement in a low Earth orbit. It will then transition into a more elliptical orbit before being propelled towards the Lagrange point L1. This journey, from launch to reaching L1, is expected to span approximately four months. L1 is located around 1.5 million km from Earth and is considered the ideal vantage point for observing the Sun continuously without interruptions. This strategic location will enable Aditya-L1 to monitor solar activities in real-time and provide valuable insights into space weather.

Aditya L1 shall be the first space based Indian mission to study the Sun. The spacecraft shall be placed in a halo orbit around the Lagrange point 1 (L1) of the Sun-Earth system, which is about 1.5 million km from the Earth. A satellite placed in the halo orbit around the L1 point has the major advantage of continuously viewing the Sun without any occultation/eclipses. This will provide a greater advantage of observing the solar activities and its effect on space weather in real time. The spacecraft carries seven payloads to observe the photosphere, chromosphere and the outermost layers of the Sun (the corona) using electromagnetic and particle and magnetic field detectors. Using the special vantage point L1, four payloads directly view the Sun and the remaining three payloads carry out in-situ studies of particles and fields at the Lagrange point L1, thus providing important scientific studies of the propagatory effect of solar dynamics in the interplanetary medium

The suits of Aditya L1 payloads are expected to provide most crucial informations to understand the problem of coronal heating, coronal mass ejection, pre-flare and flare activities and their characteristics, dynamics of space weather, propagation of particle and fields etc.

Science Objectives:

The major science objectives of Aditya-L1 mission are:

Study of Solar upper atmospheric (chromosphere and corona) dynamics.

Study of chromospheric and coronal heating, physics of the partially ionized plasma, initiation of the coronal mass ejections, and flares

Observe the in-situ particle and plasma environment providing data for the study of particle dynamics from the Sun.

Physics of solar corona and its heating mechanism.

Diagnostics of the coronal and coronal loops plasma: Temperature, velocity and density.

Development, dynamics and origin of CMEs.

Identify the sequence of processes that occur at multiple layers (chromosphere, base and extended corona) which eventually leads to solar eruptive events.

Magnetic field topology and magnetic field measurements in the solar corona .

Drivers for space weather (origin, composition and dynamics of solar wind .


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