Subject/Topic Wise Current Affairs for UPSC Exam | Physical Geography

Structure of Atmosphere

STEVE Phenomenon

STEVE Phenomenon After a severe solar storm struck Earth, the astronomical phenomena known as "Strong Thermal Emission Velocity Enhancement (STEVE)" made an unexpected appearance About STEVE phenomenon STEVE first emerged in the skies in 2017, and since then, he has returned frequently. The assertion that the phenomena have been visible in the sky since 1705 is supported by evidence. It is an extremely uncommon, enigmatic, luminous purple arc that appears nearer to the equator and extends from east to west. Why does it happen? The phenomenon is thought to be created by a 25 km wide ribbon of hot plasma…

18 August, 2022 Structure of Atmosphere

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Bright nights

Bright nights It is a phenomenon in which the night sky is bright enough to read a book even in the absence of moonlight. A new theory says it is due to slow-moving, high-altitude atmospheric waves merging together and amplifying the light from the naturally occurring airglow. The theory says that for every seven nights out of 100 there is a bright night somewhere on the earth.

12 May, 2020 Structure of Atmosphere

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Earth’s Magnetosphere

Earth’s Magnetosphere Part of: GS-I- Geography (PT-MAINS-PERSONALITY TEST) Scientists at the Indian Institute of Geomagnetism (IIG) have developed a generalized one-dimensional fluid simulation code capable of studying a wide spectrum of coherent electric field structures in near-earth plasma environments or earth’s magnetosphere. The developed simulation code is expected to help in planning of future space missions. Key Points Formation of Earth’s Magnetosphere: Sun is the major source of plasma deposition in space around the Earth. Thus, the Sun forces some of its plasma towards the earth in the form of the solar wind. Plasma is the most common state of matter in the universe as a whole.It consists of a gas of…

06 May, 2020 Structure of Atmosphere