• The BrahMos missile is a supersonic cruise missile jointly developed by India's Defence Research and Development Organisation (DRDO) and Russia's NPO Mashinostroyeniya. Its name is a portmanteau of the Brahmaputra and Moskva rivers.
• BrahMos is known for its speed and versatility. It is the fastest cruise missile in the world, capable of reaching speeds of up to Mach 3 (three times the speed of sound). This makes it extremely difficult for enemy defenses to intercept.
• The missile has both land-attack and anti-ship capabilities, meaning it can target both land-based targets and naval vessels. Its precision and range make it a potent weapon for both offensive and defensive purposes. It's deployed across various platforms including land, sea, and air.
• The BrahMos missile has become a significant asset in the Indian military's arsenal, providing a formidable deterrent and offensive capability. It's continuously being upgraded to enhance its capabilities and adapt it to different platforms and operational requirements

3. Evolution of Brahmos

• During the early 1980s, Dr. A P J Abdul Kalam spearheaded the Integrated Guided Missile Development Programme, initiating the creation of various indigenous missiles such as Prithvi, Agni, Trishul, Akash, and Nag, each with diverse capabilities and operational ranges.
• In the early 1990s, India's strategic leadership recognized the necessity for cruise missiles—guided projectiles maintaining nearly constant speeds throughout their trajectories—to deliver sizable warheads with pinpoint accuracy over extensive distances.
• This requirement emerged prominently following the deployment of cruise missiles during the 1991 Gulf War.
• In 1998, an Inter-Governmental Agreement was formalized in Moscow between Dr. Kalam, then heading the DRDO, and N V Mikhailov, Russia's Deputy Defence Minister at the time.
• This agreement laid the foundation for BrahMos Aerospace, a collaborative venture between DRDO and the Russian space company NPO Mashinostroyenia (NPOM), with the Indian side holding 50.5% ownership and the Russians 49.5%. The venture derived its name from two rivers—Brahmaputra in India and Moskva in Russia.
• Subsequently, in 1999, the development of missiles commenced within the laboratories of DRDO and NPOM after BrahMos Aerospace secured funding from both governments. The first successful test launch occurred in 2001 from a specifically engineered land-based launcher

4.Significance of Brahmos

• The BrahMos missile is equipped with a solid propellant booster engine, comprising two stages. Initially, the first stage accelerates the missile to supersonic speeds, after which it detaches. Subsequently, the liquid ramjet, constituting the second stage, propels the missile to nearly three times the speed of sound during its cruise phase.
• Notably, the missile exhibits a minimal radar signature, enhancing its stealth capabilities, and can follow various trajectories.
• As a "fire and forget" weapon, it can maintain a cruising altitude of 15 km and descend to as low as 10 meters to effectively strike its target.
• Classified as "standoff range weapons," cruise missiles like BrahMos are launched from a distance substantial enough to evade defensive countermeasures, a feature common among the arsenals of major militaries worldwide.
• Compared to subsonic cruise missiles, BrahMos boasts three times the speed, 2.5 times the flight range, and extended operational capabilities. With export versions available, BrahMos serves as a crucial asset in defense diplomacy initiatives.
• In 2022, an air-launched variant of BrahMos underwent testing from a frontline SU-30MKI aircraft, while an advanced sea-to-sea variant was also tested from the INS Visakhapatnam during the same year.
• However, BrahMos was embroiled in controversy in 2022 when Pakistan alleged that an unarmed Indian missile had inadvertently landed within its territory on March 9, 2022. The Ministry of Defence attributed the incident to a technical malfunction resulting in accidental firing.
• Though the government initiated a high-level inquiry, the specific missile involved was not officially disclosed. Nonetheless, experts inferred from its trajectory that it bore the hallmarks of BrahMos

5. Types of  BrahMos

• The BrahMos missile system is strategically deployed across various fronts, encompassing land-based formations along border regions, BrahMos-equipped Sukhoi-30 aircraft stationed in both the Northern and Southern theaters, and ships and submarines fitted with BrahMos capabilities in naval operations. This integrated setup constitutes a formidable triad, adept at addressing evolving demands in multidimensional warfare scenarios.
• To adapt to dynamic warfare requirements, ongoing efforts are focused on upgrading the BrahMos system, with emphasis on enhancing range, maneuverability, and accuracy.
• Current development initiatives include testing versions with extended ranges of up to 350 km, surpassing the original's 290 km limit. Furthermore, plans are underway for versions with even greater ranges, potentially reaching up to 800 km, and featuring hypersonic speeds. Concurrently, endeavors are directed towards reducing the size and radar signature of existing iterations while augmenting their overall capabilities.
• Across all three branches of the Armed Forces, BrahMos variants are subject to regular testing, including those presently in development.
• Land-Based: The land-based BrahMos setup comprises mobile autonomous launchers, typically housing four to six launchers, each armed with three missiles capable of near-simultaneous firing.
• These batteries are strategically deployed along India's land borders in various theaters. Upgraded versions of the land attack variant, capable of cruising at 2.8 Mach, boast precision striking capabilities with ranges of up to 400 km.
• Advanced iterations with enhanced range and speeds of up to 5 Mach are reportedly in the developmental pipeline. Notably, the ground systems of BrahMos are lauded for their streamlined design and minimal componentry.
• Ship-Based: Since 2005, the Navy has been inducting BrahMos missiles on its frontline warships, enhancing their ability to engage sea-based targets beyond the radar horizon. The naval variant has demonstrated efficacy in both sea-to-sea and sea-to-land engagements.
• These missiles can be deployed individually or in salvos of up to eight, with staggered firing intervals. This capability enables them to effectively target groups of frigates equipped with modern missile defense systems.
• Air-Launched: The successful flight testing of BrahMos from a Sukhoi-30MKI against a sea-based target in the Bay of Bengal on November 22, 2017, marked a significant milestone. Subsequent tests have validated its effectiveness.
• The BrahMos-equipped Sukhoi-30 aircraft, boasting a range of 1,500 km without mid-air refueling, serve as a pivotal strategic deterrent along both land borders and the strategically vital Indian Ocean Region. The Indian Air Force is actively integrating BrahMos with 40 Sukhoi-30 fighter jets across various airbases.
• Submarine-Launched: This variant can be launched from depths of approximately 50 meters below the water surface. The missile, stored in a canister, is vertically launched from the pressure hull of the submarine, employing distinct configurations for underwater and surface flights. Successful testing of this version was first conducted in March 2013 from a submerged platform off the coast of Visakhapatnam

6. Brahmos Missile Series

The BrahMos missile series is a family of supersonic cruise missiles developed jointly by India and Russia. Named after the Brahmaputra River in India and the Moskva River in Russia, the BrahMos series is renowned for its speed, precision, and versatility.

Here are some key variants within the BrahMos missile series:

• BrahMos Block-I: The initial variant of the BrahMos missile, featuring a range of approximately 290 km. It is capable of striking both land-based and naval targets with high accuracy.

• BrahMos Block-II: An upgraded version with enhanced capabilities, including improved range and accuracy. It incorporates advanced technologies to further enhance its effectiveness in various operational scenarios.

• BrahMos Block-III: This variant features additional upgrades aimed at improving its range, maneuverability, and stealth capabilities. It is designed to overcome evolving threats and maintain its position as a potent deterrent.

• BrahMos-A: The air-launched variant of the BrahMos missile, integrated onto Sukhoi Su-30MKI fighter aircraft of the Indian Air Force. It significantly extends the reach of the missile, allowing for precision strikes against ground and naval targets.

• BrahMos-N: The naval variant of the BrahMos missile, deployed on Indian Navy warships. It provides a formidable anti-ship and land-attack capability, enhancing the offensive capabilities of naval fleets.

• BrahMos-ER: The extended-range variant of the BrahMos missile, currently under development, aimed at achieving ranges beyond the existing capabilities. It will further enhance the strategic reach of the BrahMos series, allowing for precision strikes at longer distances.

• BrahMos-NG: A next-generation variant of the BrahMos missile, featuring reduced size and weight while maintaining high performance. It is designed for compatibility with a wider range of platforms, including aircraft, submarines, and surface vessels

SOUTHWEST MONSOON

 

 

1. Context

 

The southwest monsoon withdrew from the entire country on Thursday, a day after the usual date of October 15, the India Meteorological Department (IMD) said. At the same time, the northeast monsoon has set in over Tamil Nadu, Puducherry, Karaikal, coastal Andhra Pradesh, and other regions, the IMD said

 

2. What is the southwest monsoon?

 

• The southwest monsoon is a seasonal weather pattern that brings significant rainfall to large parts of South Asia, particularly India, between June and September
• The southwest monsoon typically begins in early June and lasts until late September. It starts with the arrival of the monsoon winds in the southern part of India, usually marked by the onset over the state of Kerala

• The southwest monsoon brings about 70-90% of India’s annual rainfall. The distribution of rainfall varies, with some regions receiving heavy rains, while others may experience scanty showers.
• The Western Ghats, the northeastern states, and the Himalayan foothills typically receive very heavy rainfall.
• The monsoon is critical for the Kharif crop season in India, which includes crops like rice, maize, pulses, and cotton. Adequate and timely monsoon rains are essential for a good harvest
• The monsoon starts retreating from northwestern India in early September and completely withdraws from the Indian subcontinent by mid-October. This phase is also known as the retreating or northeast monsoon

Mechanism:

• High-Pressure Area: During the summer, intense heating of the landmass in the Indian subcontinent creates a low-pressure area over northern India and the Tibetan Plateau.
• Low-Pressure Area: The Indian Ocean remains relatively cooler, creating a high-pressure area.
• Wind Movement: Air moves from the high-pressure area over the ocean to the low-pressure area over the land, carrying moisture from the ocean and resulting in rainfall.

The monsoon trough is an elongated area of low pressure extending from the heat low over Pakistan and northwestern India to the Bay of Bengal. It influences the distribution and intensity of the monsoon rains.

 

3. What are easterly and westerly winds?

 

Easterly Winds

 

• Easterly and westerly winds refer to the direction from which the winds originate
• Easterly winds are winds that blow from the east towards the west
• Easterly winds can affect weather patterns, including the development of tropical storms and cyclones. For instance, easterly waves in the tropics can lead to the formation of tropical cyclones in the Atlantic and Pacific Oceans

Characteristics:

• Trade Winds: One of the most well-known examples of easterly winds are the trade winds. These winds blow from the east towards the west in the tropics, from the subtropical high-pressure areas toward the equatorial low-pressure areas.
• Tropical Regions: In the tropical regions, particularly between 30 degrees north and south of the equator, easterly winds are prevalent. These are crucial for the weather patterns and climatic conditions in these regions.
• Monsoon Winds: During certain seasons, such as the northeast monsoon in India, easterly winds play a significant role. These winds bring dry air from the land towards the ocean during the winter months.

Westerly Winds

 

• Westerly winds are winds that blow from the west towards the east

• Westerly winds play a significant role in the weather of temperate regions, influencing the climate and the movement of storm systems.
• They are also responsible for carrying warm and moist air from the oceans inland, affecting precipitation patterns in coastal and inland regions.
• The westerlies can affect transoceanic travel and weather prediction due to their influence on the movement of high and low-pressure systems

Characteristics:

• Prevailing Westerlies: These winds are predominant in the mid-latitudes (between 30 and 60 degrees north and south of the equator). They blow from the subtropical high-pressure belts towards the poles.
• Jet Streams: High-altitude westerly winds known as jet streams are important in influencing weather patterns and the movement of weather systems across the globe. They are fast flowing and occur in the upper levels of the atmosphere.
• Polar Front: In the mid-latitudes, the westerlies interact with polar easterlies near the polar front, leading to the development of extratropical cyclones and storms

 

 

4.How does monsoon occur in India?

Monsoons in India occur due to seasonal changes in wind patterns and temperature differences between land and sea.

Here's a concise explanation of the process:

• Differential heating: During summer, the Indian landmass heats up more quickly than the surrounding Indian Ocean.
• Low pressure system: The heated land creates a low-pressure area over the Indian subcontinent.
• Wind direction shift: This low pressure draws in moisture-laden winds from the cooler Indian Ocean towards the land.
• Orographic lift: As these winds encounter geographical features like the Western Ghats or the Himalayas, they are forced to rise.
• Condensation and precipitation: The rising air cools, causing water vapor to condense and form clouds, leading to heavy rainfall.
• Duration: This pattern typically lasts from June to September, bringing the majority of India's annual rainfall.

 

5.What are the conditions that determine the onset of monsoon?

 

• The primary driver is the temperature difference between the land and the surrounding sea. During summer, the land heats up faster than the ocean, creating a low-pressure area over the land and a high-pressure area over the ocean. This pressure difference leads to the movement of moist air from the ocean to the land
• Warm sea surface temperatures are crucial as they increase the evaporation rate, contributing to the formation of moist air masses that drive the monsoon rains.
• The monsoon winds, which are part of the larger atmospheric circulation, shift according to the seasonal temperature differences. The southwest monsoon, for instance, is driven by the southwest winds that carry moisture from the Indian Ocean to the Indian subcontinent.
• The geographical features, such as mountain ranges, play a significant role. For example, the Western Ghats in India force moist air to rise, cool, and condense, leading to heavy rainfall on the windward side
• The movement and strength of the high-pressure systems over the oceans and low-pressure systems over the land influence the intensity and timing of the monsoon.
• Phenomena such as El Niño and La Niña can affect the strength and timing of the monsoon. For example, El Niño can lead to weaker monsoons due to altered wind patterns and sea surface temperatures

6.What is the impact of La-Nina and El Nino on monsoon?

 

La Niña and El Niño, both phases of the El Niño-Southern Oscillation (ENSO) phenomenon, have significant impacts on the monsoon patterns around the world.

 

Here’s how each affects the monsoon:

El Niño

• El Niño is generally associated with a weaker Indian monsoon. The warming of the central and eastern Pacific Ocean during El Niño tends to disrupt the normal atmospheric circulation patterns, leading to reduced rainfall over the Indian subcontinent.
• The onset of the monsoon can be delayed, and the overall intensity of the rainfall during the monsoon season might be lower than usual
•  El Niño often brings drier conditions to Southeast Asia and northern Australia, leading to droughts and reduced rainfall
• Eastern and southern Africa may experience drier conditions as well

La Niña

• La Niña, characterized by cooler-than-average sea surface temperatures in the central and eastern Pacific Ocean, is typically associated with a stronger Indian monsoon. It often leads to increased rainfall over the Indian subcontinent
• The enhanced monsoon can lead to heavier rains and potentially more frequent and intense flooding
• La Niña tends to bring wetter conditions to Southeast Asia and northern Australia, potentially causing heavy rains and flooding
• La Niña can lead to wetter conditions in parts of northern South America

 

7.Way Forward

 

The intermittent development of a wind shear zone — where winds move with different velocities and directions — along latitudes 20 ° N between central and peninsular India

 

 

 

For Prelims: Indian and World Geography For Mains: GS-I, GS-III: Important Geophysical phenomena and environment

 

 

Previous Year Questions   1.Consider the following statements: (UPSC CSE 2012)   1. The duration of the monsoon decreases from southern India to northern India. 2. The amount of annual rainfall in the northern plains of India decreases from east to west.   Which of the statements given above is/are correct? A. 1 Only B. 2 Only C. Both 1 and 2 D. Neither 1 nor Answer (C) The duration of the monsoon indeed decreases from southern India to northern India. The southern part of India experiences the monsoon earlier and for a longer duration compared to the northern part. The amount of annual rainfall in the northern plains of India decreases from east to west. The eastern part of the northern plains receives more rainfall compared to the western part, largely due to the influence of the Bay of Bengal branch of the Southwest Monsoon.

 

 

Source: The Hindu