Skip to main content

Talk about "VAN ALLEN BELT"

Image
By

CHARGED PARTICLE ARRANGED IN REGION AROUND THE EARTH


  • The Van Allen Belt is a region about 700 to 60,000 km above the surface of earth which is populated by energetic charged particles.The shape of the region is like a torus or a doughnut and the charged particle which exist in the region are those which have been trapped by the earth magnetic field. This is closely related to the phenomenon of the auroras in the polar region-bright lights seen because charged particle from outer space hit the outer atmosphere and radiate light in the process. this belt was discovered by J.Van Allen in 1958 using the explorer stat-elite.



  • There are two distinct torus shaped belts-the inner and the outer one-with density which are a maximum at the equatorial latitudes and which drop off to zero beyond latitudes of approximately 60 in each hemisphere.
  • The outer belt,roughly in the region of 20,000 to 60,000 KM above the surface of the earth, consist of very energetic particles.These are mostly electrons but also consists of charged ions.The inner belt,approximately extending from 700 to 10,000 KM above the earth, predominately consists of non relativistic protons and electrons. 




  • The gap between the Outer and Inner belts arises out of the interaction of low frequency radio waves with the charged particles in the region.Charged particle that accumulate there interact with the radio waves in a way that causes them to be ejected from that region.Various sources of radio waves have been produced.
  • The charged particle that populates the inner and outer Van Allen belts do not originated from the same source.the electron which dominates the outer belts are injected into the outer region during geomagnetic storms.The proton,which dominates the inner belts are products of neutron decay after being created in the collisions of the cosmic rays with the air molecules in the upper atmosphere.
Labels:

Comments

Post a Comment

Popular posts from this blog

How Energy conversion from coal is done?

By
Single generator sets of over 600 MW are now used in the UK, though there are many smaller generators in use. A 600 MW generator can supplythe average needs of over 1 million UK households. Three or four such generators are typically installed in a single large coal-fired station which isoften sited close to a coal mine, away from the city dwellers who consume the electricity. Such generators are usually driven by a compound arrangement of highpressure, intermediate-pressure and low-pressure turbines, increasing in size as the pressure decreases. Modern turbines rotate in a speed range from 1500 to 3500 r.p.m., usually 3000 r.p.m. for the UK’s 50 Hz system. For large coal-fired plant the steam pressure could be 25 megapascals (MPa) with steam temperatures of 500–600 °C to improve the thermodynamic efficiency. In nuclear reactors, which operate under less demanding conditions, the steam is superheated to about 5 MPa and 300 °C. Modern water tube boilers are complex and have ...
Post a Comment
Read more

How ASPs works?

By
The Web and the Internet began to really heat up and receive significant media exposure starting around 1994. Initially, the Web started as a great way for academics and researchers to distribute information; but as millions of consumers flocked to the Internet, it began to spawn completely new business models. Three good examples of innovative models include:   • Amazon - Amazon (which opened its doors in July, 1995) houses a database of millions of products that anyone can browse at any time. It would have been impossible to compile a list this large in any medium other than the Web.   • Ebay - Online auctions make it easy and inexpensive for millions of people to buy and sell any imaginable item. It would be impossible to do this at a reasonable cost or in a timely manner with any medium other than the Web.   • Epinions - Thousands of people contribute to a shared library of product reviews. One of the Web's greatest strengths is its worldwide view a...
Post a Comment
Read more

All about Electronics & Instrumentation Engineering)(EI)

By
  Vision : To be globally recognized as a seat of learning and innovation in Electronics for application to Communication, Transportation, Defence, Industry, Health Care, Entertainment, and many other consumer products.  Mission : 1). To produce quality engineers in the field of Electronics and related domains.  2) To conduct research and develop products in the fields of Chip design, Communication Systems, Electronics Instrumentation, Signal Processing and other related areas with strong emphasis on critical state of the art applications.  3) To grow in the area of Design and Manufacturing of chips, boards and systems.     Program Educational Objectives :  I.  To provide students a successful career in industry that meets the needs of national and multinational companies.  II.  To develop the ability among students to synthesize data and technical concepts for application to electronic product design and to solve real...
Post a Comment
Read more