DAILY CURRENT AFFAIRS IAS | UPSC Prelims and Mains Exam – 31st August 2023
Archives (PRELIMS & MAINS Focus) Chandrayaan-3 Syllabus Prelims –Science and Technology Context: Chandrayaan-3 probe shows 50°C temperature difference between the moon’s surface and below it. Background:- On August 27, 2023, the Indian Space Research Organization (ISRO) released a graph of the temperature variation between the moon’s surface and a point around 8 cm below as measured by an instrument named ChaSTE on board the lander module of the Chandrayaan-3 mission. ChaSTE – short for ‘Chandra’s Surface Thermophysical Experiment’. Developed by: the Space Physics Laboratory of ISRO’s Vikram Sarabhai Space Centre (VSSC), with the Physical Research Laboratory (PRL), Ahmedabad. It is a temperature probe that can be driven into the moon’s surface using a motor to a depth of up to 10 cm. It measured the temperature profile of the lunar topsoil around the south pole to understand its thermal behaviour. Its data show that at the moon’s surface (where the lander is located, a point between the craters Manzinus C and Simpelius N), the temperature is 40-50 degrees C. But just under 80 mm under, it plunges to around -10 degrees C. About Chandrayaan-3:- IMAGE SOURCE: IASBABA Chandrayaan-3 is the successor to the Chandrayaan-2 mission. Launch Vehicle: Mark-III (LVM3). Launched site: Satish Dhawan Space Centre (SDSC), Sriharikota, Andhra Pradesh. Composition: It consists of an indigenous Lander module (LM), a Propulsion module (PM), and a Rover. Lander: a spacecraft that descends towards and comes to rest on, the surface of an astronomical body. Propulsion module: a box-like structure, mounted with a large solar panel on one side and a large cylinder on top. Rover: a small vehicle that can move over rough ground, often used on the surface of other planets, sometimes controlled from the earth. The Lander and the Rover have scientific payloads to carry out experiments on the lunar surface. There will not be any orbiters like Chandrayaan 2 in it. Objectives of Chandrayaan-3 mission:- To demonstrate a Safe and Soft Landing on the Lunar Surface. To demonstrate Rover roving on the moon. To conduct in-situ scientific experiments. Lander payloads:- Chandra’s Surface Thermophysical Experiment (ChaSTE): to measure the thermal conductivity and temperature Instrument for Lunar Seismic Activity (ILSA): for measuring the seismicity around the landing site Langmuir Probe (LP): to estimate the plasma density and its variations. A passive Laser Retroreflector Array from NASA is accommodated for lunar laser ranging studies. Rover payloads:- Alpha Particle X-ray Spectrometer (APXS) and Laser Induced Breakdown Spectroscope (LIBS): for deriving the elemental composition near the landing site. Propulsion Module Payload:- Spectro-polarimetry of Habitable Planet Earth (SHAPE): Future discoveries of smaller planets in reflected light would allow us to probe into a variety of Exo-planets which would qualify for habitability or for the presence of life. About GSLV-Mk III:- Weighs: 641 tones. Capacity: GSLV can take 10,000-kg satellites to lower earth orbits. It is also known as the Launch Vehicle Mark 3 (LVM3). It is a three-stage vehicle. It has two solid motor strap-ons, a liquid propellant core stage, and a cryogenic stage. It is the heaviest and the shortest among India’s operational launch vehicles. MUST READ: Gaganyaan SOURCE: THE HINDU PREVIOUS YEAR QUESTIONS Q.1) Which one of the following countries has its own Satellite Navigation System? (2023) Australia Canada Israel Japan Southwest monsoon Syllabus Prelims –Geography Context: As per recent reports, Rishikesh in Uttarakhand was India’s wettest town for most of August during the southwest monsoon season in 2023. Background:- Between August 1 and August 25, the town received 1,901 millimeters of rainfall. During the same period, the two wettest places in India and the world, Cherrapunji and Mawsynram, received 1,876.3 mm and 1,464 mm of rainfall respectively. About the southwest monsoon:- Monsoons are seasonal winds that reverse their direction with the change of season. Monsoons are peculiar to the Indian Subcontinent, South East Asia, parts of Central Western Africa, etc. They are more pronounced in the Indian Subcontinent compared to any other region. India receives southwest monsoon winds in summer and northeast monsoon winds in winter. South-west monsoons: formed due to an intense low-pressure system formed over the Tibetan plateau. North-east monsoons: associated with high-pressure cells over Tibetan and Siberian plateaus. South-west monsoons bring intense rainfall to most of the regions in India. Other Countries receiving most of the annual rainfall during the southwest monsoon season: Indonesia, Bangladesh, Myanmar, etc. Factors responsible for the onset of south-west monsoon:- Intense heating of the Tibetan plateau: The Tibetan plateau gets intensely heated during summer, resulting in strong vertical air currents and the formation of low pressure over the plateau at about 9 km above sea level. Permanent high-pressure cell in the South Indian Ocean. Subtropical Jet Stream (STJ). Tropical Easterly Jet (African Easterly Jet). Inter Tropical Convergence Zone (ITCZ): It is a broad trough of low pressure in equatorial latitudes. This is where the northeast and the southeast trade winds converge Factors that influence the intensity of south-west monsoons:- Strengths of Low pressure over Tibet and high pressure over the southern Indian Ocean. Somali Jet (Findlater Jet). Somali Current (Findlater Current). Indian Ocean branch of Walker Cell. Indian Ocean Dipole. Mechanism of Monsoon:- The location of ITCZ shifts north and south of the equator with the apparent movement of the Sun. June: The sun shines vertically over the Tropic of Cancer and the ITCZ shifts northwards. The southeast trade winds of the southern hemisphere cross the equator and start blowing in the southwest to a northeast direction under the influence of the Coriolis force. These winds collect moisture as they travel over the warm Indian Ocean. July: The ITCZ shifts to 20°-25° N latitude and is located in the Indo-Gangetic Plain. This causes the southwest monsoons to blow from the Arabian Sea and the Bay of Bengal. The ITCZ in this position is often called the Monsoon Trough. The shift in the position of the ITCZ is also related to the phenomenon of the withdrawal of the westerly jet stream from its position over the north Indian plain, south of the Himalayas. Easterly
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