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All about the Aditya - L1, ISRO's satellite to study the Sun

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Indian Space Research Organisation's (ISRO) Aditya-L1 mission, originally named as the Aditya-1 mission, is a satellite designed to study the solar corona (outer layers of the Sun) which is quite similar to NASA's Parker Solar Probe.

All about Aditya - L1

  1. The satellite was conceived as a 400 kg class satellite carrying just one payload, the Visible Emission Line Coronagraph (VELC).
  2. It was planned to be launched in an 800 km low earth orbit.
  3. But, later, it was realised that a satellite placed in the halo orbit around the L1 point of the Sun-Earth orbit has the advantage of continuously viewing the Sun without any obstructions. Therefore, the mission was revised to be called as the Aditya-L1 mission.
  4. The Aditya - L1 will be inserted in a halo orbit around the Lagrangian point 1 (L1), which is 1.5 million km from the Earth.
  5. Lagrangian point is a point where the attraction by the Sun and the Earth becomes equal. The point doesn't experience gravitational force. If you put a satellite there, it won't get deflected, yet your captured data will be accurate.

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6. The satellite will perform additional experiments and will also observe the Sun's Photosphere and the Chromosphere.
7. Aditya - L1 will have six additional payloads.

When will the Aditya - L1 be launched?

Here is a complete list of payloads and their science objectives:

  • Visible Emission Line Coronagraph (VELC): To study the diagnostic parameters of solar corona and dynamics and origin of Coronal Mass Ejections (3 visible and 1 Infra-Red channels); magnetic field measurement of solar corona down to tens of Gauss.
  • Solar Ultraviolet Imaging Telescope (SUIT): To image the spatially resolved Solar Photosphere and Chromosphere in near Ultraviolet (200-400 nm) and measure solar irradiance variations.
  • Aditya Solar wind Particle Experiment (ASPEX): To study the variation of solar wind properties as well as its distribution and spectral characteristics.
  • Plasma Analyser Package for Aditya (PAPA): To understand the composition of solar wind and its energy distribution.
  • Solar Low Energy X-ray Spectrometer (SoLEXS): To monitor the X-ray flares for studying the heating mechanism of the solar corona.
  • High Energy L1 Orbiting X-ray Spectrometer (HEL1OS): To observe the dynamic events in the solar corona and provide an estimate of the energy used to accelerate the particles during the eruptive events.
  • Magnetometer: To measure the magnitude and nature of the Interplanetary Magnetic Field.

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