Akash Surface-to-Air Missile (SAM)
Why in News: The Indian Akash Surface-to-Air Missile (SAM) system, often dubbed as the “Iron-Dome” of India, is in competition with the Chinese-made Sky Dragon-50 air defense systems for a procurement contract from Brazil.
About Akash Surface-to-Air Missile (SAM):
- Purpose: It is a short-range surface-to-air missile system designed to safeguard vulnerable areas and critical points from airborne threats.
- Development and Production: Developed indigenously by India’s Defence Research and Development Organisation (DRDO) and manufactured by Bharat Dynamics Ltd (BDL) in Hyderabad.
- Capabilities: Designed to counter diverse air threats including fighter jets, cruise missiles, air-to-surface missiles, and ballistic missiles.
- Currently operational with the Indian Army and Indian Air Force.
- Features:
- Dimensions: 5.8 meters in length, 350 mm in diameter, with a wingspan of 1,105 mm.
- Launch weight: 720 kg.
- Speed: Capable of flying at up to Mach 2.5 with a ceiling height of 18 km.
- Range: Can engage targets up to 45 km away.
- Radar System: Equipped with the high-power Rajendra phased array radar, which scans and guides the missile to its target, providing range, azimuth, and height information.
- Operational Modes: Can engage multiple targets simultaneously in group or autonomous mode.
- Electronic Warfare Capabilities: Includes built-in Electronic Counter-Counter Measures (ECCM) features.
- Guidance System: Command guidance for accurate targeting.
- Mobility: Configured on mobile platforms for rapid deployment.
- Architecture: Features an open-system architecture to adapt to current and future air defense environments.
New Spider Species
Why in News: Researchers from Christ College, Irinjalakuda, have recently discovered two new species of jumping spiders that inhabit the leaf litter of the evergreen forests in the southern Western Ghats.
About New Spider Species:
- Discovery and Classification: The genus Habrocestum has welcomed two new members, Habrocestum swaminathan and Habrocestum benjamin, discovered by researchers.
- Ecological Importance: These spiders play a crucial role in natural pest control and serve as important indicators of ecosystem health.
- Habrocestum swaminathan: Named after M.S. Swaminathan, it was found along the banks of the Kunthi River, originating from Silent Valley. M.S. Swaminathan’s contributions to science and conservation inspired the naming.
- Habrocestum benjamin: Collected near Thusharagiri, part of the Nilgiri biosphere reserve, this species is noted for its attractive color patches. It was named in honor of Suresh P. Benjamin, an expert on jumping spiders based in Sri Lanka.
Mount Etna
Why in News: Recently, Mount Etna in Italy and the smaller Stromboli volcano emitted hot ash and lava, prompting heightened alert levels on the Mediterranean island of Sicily.
About Mount Etna:
Activity and Size:
- Mount Etna is Europe’s most active volcano and ranks among the largest globally.
- It has a recorded history of volcanic activity dating back to 1500 B.C.
Location:
- Situated on the eastern coast of Sicily, Italy.
Physical Characteristics:
- It stands as the highest mountain in Italy south of the Alps, towering approximately 3,326 meters high.
- Mount Etna is recognized as the highest peak on a Mediterranean island.
Stratovolcano Definition:
Also Known As:
- A stratovolcano is commonly referred to as a composite volcano due to its layered structure formed by successive eruptions.
Geological Features:
- These volcanoes typically exhibit a conical shape, tapering gently at the base and steeply near the summit, creating prominent mountain peaks.
- Stratovolcanoes are often located above subduction zones where tectonic plates collide, contributing to their frequent volcanic activity.
- They are prevalent in extensive volcanic regions worldwide, such as the Ring of Fire encircling much of the Pacific Ocean.
Groynes
Why in News: To address the severe coastal erosion in the Poonthura region of Kerala, the irrigation department plans to build eight groynes, amounting to a project cost of Rs 17.5 crore.
About Groynes:
Definition and Structure:
- Groynes are solid structures extending from the shoreline into the sea, typically perpendicular or at a slight angle to the coast.
- They are commonly constructed from materials such as wood, rock, concrete, or metal.
Function and Purpose:
- Their primary function is to arrest coastal erosion by trapping sediment that moves along the shoreline due to longshore drift.
- Longshore drift is the movement of sediment caused by waves hitting the shore at an angle, carrying sediment along the beach.
Advantages:
- Groynes are relatively straightforward to build and maintain.
- They have a long lifespan and require minimal upkeep.
- By trapping sediment, they contribute to beach widening and reduce erosion.
- They effectively dissipate wave energy, thereby protecting the coastline.
Long-term Coastal Stabilization:
- When properly designed and maintained, groynes serve as robust structures that stabilize coastlines over extended periods.
- They help maintain beaches used for various societal activities, reducing the need for frequent beach nourishment and sand recycling.