New Delhi, Aug 27: Chandrayaan-3 mission is expected to send home information about the Moon’s atmosphere, soil and minerals which may be the first of its kind for the scientific community across the world and of far-reaching implications in the times to come, Union Minister for Space Dr Jitendra Singh said on Sunday. He added that Vikram Lander and Pragyan Rover have started performing the Mission objectives exactly as per the schedule.
In a statement issued here, Dr Singh said the main focus of the science payloads onboard Chandrayaan-3 is to provide an integrated assessment of the lunar surface features, including the thermal properties and surface elements of the lunar topsoil (regolith) as well as the plasma environment near the surface, he said. It will also assess the lunar seismic activities and the impact of meteors on the lunar surface.
“All these are essential for the fundamental understanding of the lunar near-surface environment and for making future lunar habitat developments for explorations,” he said.
Vikram Lander carries a seismometer (ILSA), ChaSTE, Langmuir Probe (RAMBHA-LP), and a laser retroreflector array payloads and the Pragyan Rover carries Alpha Particle X-ray Spectrometer (APXS) and Laser Induced Breakdown Spectroscopy (LIBS) payloads.
“All these payloads are planned for continuous operations from 24th August 2023 till the end of the mission,” the minister said.
The Instrument for Lunar Seismic Activity (ILSA) will make continuous observations of the lunar seismic activities as well as the meteors impacting the lunar surface. ILSA is the first-ever seismometer sent to study the vibrations on the lunar surface at higher lunar latitudes.
“These measurements will help us plan for future habitat developments by understanding the frequency of potential hazards from meteor impacts and seismic activities,” Dr Jitendra said.
The ChaSTE (Chandra’s Surface Thermo-physical Experiment) is another key instrument mounted on the Vikram Lander, said Dr Jitendra Singh. Ten high-precision Thermal Sensors, mounted on ChaSTE, will dig into the moon’s top soil to study temperature variations.
ChaSTE is the first-ever experiment to study the thermophysical properties of the first 10 cm of the lunar surface. The surface of the moon undergoes substantial temperature variations during the lunar day and night, with minimum temperatures of <-100 ℃ around the local midnight, and >100℃ around the local noon.
The porous lunar topsoil (having a thickness of about ~5-20 m) is expected to be an excellent insulator. Because of this insulating property and the absence of air, a very significant temperature difference is expected between the top surface and the interior of the regolith.
The study of the near-surface plasma of the Moon and its time variations will be carried out by the Langmuir probe. RAMBHA-LP will be the first-ever in-situ observation of the near-surface plasma and its diurnal variation in higher lunar latitude, where the Sun elevation angle is less, Dr Singh said, adding that these will help assess the lunar surface charging for future manned missions.
