Meteor scatter: Difference between revisions

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Related wiki pages [[Bands]], [[Propagation]], [[Aurora]], [[Tropospheric ducting]], [[Lightning scatter]], [[Trans-Equatorial Propagation]]


informations from some articles.You can see from this link
== What is it? ==
The Earth moves in a roughly elliptical path around the sun. Whilst moving along this path, the Earth encounters many thousands of particles known as meteors. These vary in size from microscopic to large enough to pass through the atmosphere and hit the surface - these are known as meteorites.


Once meteors enter the atmosphere, they begin to burn up due to the friction caused by the density of the atmosphere. This causes a stream of ionised particles - sometimes of sufficient density for radio waves to be reflected. The degree of ionisation is dependent on the size of the meteor, hence the frequencies that are reflected are also dependent on this,


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Generally frequencies between 20MHz and 500MHz are reflected by meteor inoisation.
[http://www.articlesbase.com/supplements-and-vitamins-articles/my-weight-loss-experience-with-the-acai-berry-diet-1726693.html Acai Berry]
 
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Because meteors are usually in the atmosphere for no more than a few minutes, meteor scatter propagation occurs in brief windows and is dependent on:
[http://www.buzzle.com/articles/the-facts-and-half-truths-about-the-acai-berry-diet.html Acai Berry]
 
* the size of the meteors
* the altitude at which the ionised stream is created
* the location over which the meteor is falling
* the angle of entry of the meteor
* the relative positions of the stations
 
== How is it used?==
 
Because of its brief and unpredictable nature stations that experiment with meteor scatter use the following:
 
* repeated signals are transmitted continuously over a long period of time
* because of the brevity of the effect, a signal report may take some time to be received
* a complete exchange of information may take some time to complete
* Single Sideband is a popular mode for meteor scatter communications
* [http://amateur-radio-wiki.net/index.php?title=Codes_and_Alphabets#Morse_Code Morse Code] is often used due to the brevity of communications
* [http://www.physics.princeton.edu/pulsar/K1JT/ WSJT] software is often used by amateurs involved in meteor scatter communication
 
==Meteor shower prediction ==
 
A number of sites provide meteor shower calendars including:
 
* [http://www.imo.net/calendar/2008?PHPSESSID=ca939912fd0c1798898ac67c765981f4 IMO meteor shower calendar]
 
==Links==
 
*[http://www.imo.net/ International Meteor Organization]
 
 
{{propagation}}

Latest revision as of 05:21, 14 October 2010

Related wiki pages Bands, Propagation, Aurora, Tropospheric ducting, Lightning scatter, Trans-Equatorial Propagation

What is it?

The Earth moves in a roughly elliptical path around the sun. Whilst moving along this path, the Earth encounters many thousands of particles known as meteors. These vary in size from microscopic to large enough to pass through the atmosphere and hit the surface - these are known as meteorites.

Once meteors enter the atmosphere, they begin to burn up due to the friction caused by the density of the atmosphere. This causes a stream of ionised particles - sometimes of sufficient density for radio waves to be reflected. The degree of ionisation is dependent on the size of the meteor, hence the frequencies that are reflected are also dependent on this,

Generally frequencies between 20MHz and 500MHz are reflected by meteor inoisation.

Because meteors are usually in the atmosphere for no more than a few minutes, meteor scatter propagation occurs in brief windows and is dependent on:

  • the size of the meteors
  • the altitude at which the ionised stream is created
  • the location over which the meteor is falling
  • the angle of entry of the meteor
  • the relative positions of the stations

How is it used?

Because of its brief and unpredictable nature stations that experiment with meteor scatter use the following:

  • repeated signals are transmitted continuously over a long period of time
  • because of the brevity of the effect, a signal report may take some time to be received
  • a complete exchange of information may take some time to complete
  • Single Sideband is a popular mode for meteor scatter communications
  • Morse Code is often used due to the brevity of communications
  • WSJT software is often used by amateurs involved in meteor scatter communication

Meteor shower prediction

A number of sites provide meteor shower calendars including:

Links


Propagation and radio wave theory
Propagation Aurora * E-Skip * IPS * Lightning scatter * Meteor scatter * Satellites * Trans-Equatorial Propagation * Tropospheric ducting
Interference QRM * QRN
Theory Electromagnetic Waves * Frequency Wavelength and Period
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