RAO'S PODIUM -35- THIRTY FIVE

• https://www.timeanddate.com/geography/southern-northern-hemisphere.html
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The Northern Hemisphere is the northern half of the Earth.

 It begins at 0° latitude (the equator) and continues north until it reaches 90°N latitude (the North Pole).

• What Is the Southern Hemisphere?

  The Southern Hemisphere is the southern half of the Earth. 

• It starts at 0° latitude and continues south until it reaches the 90°S latitude (the South Pole).

• Earth is divided into the Northern Hemisphere and the Southern Hemisphere at the equator. The two hemispheres have opposite seasons, and the night sky can look very different.

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• The Earth is divided into the Northern and Southern Hemispheres by the Equator, an imaginary line at 

  

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   latitude. The Northern Hemisphere contains most of the Earth's land (

  
  

  ) and roughly 

  
  

   of the population. The hemispheres experience opposite seasons due to Earth’s tilt: when it is summer in the north, it is winter in the south

• Northern Hemisphere Features:
  • Location: North of the Equator up to the North Pole.
  • Landmasses: Contains North America, Europe, most of Asia, and northern parts of South America and Africa.
  • Population & Pollution: Home to 
    
    
     of the global population and holds significantly more air pollution due to higher industrial activity.
  • Stars: Features constellations like Polaris (North Star). 
  Southern Hemisphere Features:
  • Location: South of the Equator down to the South Pole.
  • Geography: Primarily ocean, covering 
    
    
     water. It includes Australia, Antarctica, and southern parts of South America and Africa.
  • Population: Less than 
    
    
     of the world's population lives here.
  • Seasons: Summer is from December to February; winter is from June to August. 
  Key Differences:
  • Seasons: Opposite, with summer in one corresponding to winter in the other.
  • Moon Visibility: The Moon appears "upside down" compared to the Northern
  • Hemisphere.
  • Coriolis Effect: Winds and water deflect to the right in the North and left in the South
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  • The Coriolis effect is the apparent deflection of moving objects—like air currents, water, and projectiles—to the right in the Northern Hemisphere and to the left in the Southern Hemisphere, caused by the Earth’s rotation.
  •  It acts as a "pseudo force" that curves paths, impacting weather patterns, ocean currents, and long-range navigation.
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  • Auroras (Northern Lights/Aurora Borealis 
  • and Southern Lights/Aurora Australis) are natural, vibrant light displays in the night sky, predominantly appearing in high-latitude regions.
  • They are caused by solar wind—charged particles from the sun—colliding with oxygen and nitrogen gas particles in Earth’s upper atmosphere
  • Colors and Location
    • Colors: The color depends on the gas and altitude. Green is common (oxygen, lower altitude), while red (oxygen, high altitude) and purple/blue (nitrogen) also appear.
    • Location: While concentrated at the poles, strong solar activity (geomagnetic storms) can make them visible at lower latitudes.
    • Other Planets: Auroras also occur on other planets, such as Jupiter, which has auroras over a thousand times brighter than Earth's
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    • How Auroras Are Formed
      • Solar Activity: The sun constantly emits solar wind, which intensifies during solar flares and coronal mass ejections (CMEs), launching charged particles into space.
      • Magnetic Deflection: These charged particles reach Earth, where the magnetosphere (Earth’s magnetic field) deflects most of them, but channels some towards the North and South Poles
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      Atmospheric Collisions: The particles enter the upper atmosphere and collide with gases, primarily oxygen and nitrogen, triggering an excitation process similar to a neon lamp, making the gases glow.
      Light Display: The interaction creates visible auroral ovals, usually forming streaks, curtains, or arcs of light. 
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