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Gaganyaan mission: ISRO successfully conducts first SOLVE ground test

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Flora & Fauna

Spot-billed Pelican (Pelecanus philippensis)
Status: Near Threatened
Threat: Vulnerable to high-decibel acoustic disturbances and chemical runoff from rocket motor testing near its nesting grounds in Pulicat Lake.
Greater Flamingo (Phoenicopterus roseus)
Status: Least Concern
Threat: Migratory flocks wintering in the adjacent Pulicat Lake Bird Sanctuary are highly sensitive to noise pollution and habitat degradation.
Olive Ridley Sea Turtle (Lepidochelys olivacea)
Status: Vulnerable
Threat: Potential risk from marine debris, acoustic shock, and physical impact during the planned splashdown of the Crew Module in Indian sea waters.

Ecology Impact

The Satish Dhawan Space Centre (SDSC-SHAR) in Sriharikota is situated adjacent to the Pulicat Lake Bird Sanctuary, notified under the Wildlife (Protection) Act, 1972. Ground testing of solid rocket motors like SOLVE releases localized emissions (such as hydrochloric acid and aluminum oxide) that can cause acid deposition and affect the fragile wetland ecosystem, which is classified as a CRZ-I (ecologically sensitive) area under the Coastal Regulation Zone rules of the Environment (Protection) Act, 1986. Additionally, the planned splashdown of the Gaganyaan Crew Module in Indian sea waters poses potential, albeit temporary, physical and acoustic disturbances to marine habitats.

Science & Tech Angle

The SOLVE solid motor utilizes a modified PSLV strap-on motor with a slow burn rate propellant and a straight nozzle with secondary injection thrust vector control (SITVC) for precise trajectory control. The test validates the deceleration system of the Gaganyaan Crew Module, which relies on a sequential deployment of 10 parachutes to reduce velocity from supersonic speeds to safe splashdown limits. This is integrated with the Environmental Control and Life Support System (ECLSS) to maintain a habitable environment inside the module.

Climate Change Link

Solid rocket propellants, typically based on Hydroxyl-terminated polybutadiene (HTPB) and ammonium perchlorate, release carbon dioxide, carbon monoxide, and black carbon (soot) directly into the stratosphere. These emissions have high global warming potential and contribute to ozone depletion, presenting a challenge to India's climate commitments under the Paris Agreement. This underscores the importance of transitioning to green propellants, such as liquid oxygen/kerosene or LOX/Methane, which ISRO is actively researching.

Sustainable Development

The mission aligns with SDG 9 (Industry, Innovation, and Infrastructure) by fostering advanced indigenous space technology and aerospace capabilities. It also intersects with SDG 14 (Life Below Water) and SDG 15 (Life on Land), necessitating rigorous environmental protocols to prevent chemical contamination of marine and coastal ecosystems during rocket launches and sea splashdowns.

International Frameworks

Paris Agreement
The emissions of black carbon and greenhouse gases from solid rocket propellants directly impact the stratosphere, highlighting the need for green space technologies to align with India's Nationally Determined Contributions (NDCs).
Convention on Migratory Species (CMS)
Protects migratory species like the Greater Flamingo and Olive Ridley Sea Turtle, which inhabit the coastal and marine ecosystems surrounding the Sriharikota launch site and splashdown zones.
Convention on Biological Diversity (CBD)
Emphasizes the conservation of biological diversity and sustainable use of its components, requiring environmental impact assessments (EIAs) for major developmental and technological projects like spaceports near ecologically sensitive areas.

Sources consulted

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