internet.com
You are in the: Small Business Computing Channelarrow View Sites +
Small Business Technology
» ECommerce-Guide | Small Business Computing | Webopedia | WinPlanet |  »Close
Webopedia.com
Enter a word for a definition... ...or choose a computer category.
 
 

menu
   Home
   Term of the Day
   New Terms
   Pronunciation
   New Links
   Quick Reference
   Did You Know?
   Categories
   Tech Support
   Webopedia Jobs
   About Us
   Link to Us
   Advertising
  

talk to us
   Submit a URL
   Suggest a Term
   Report an Error

internet.com
Developer
International
Internet Lists
Internet News
Internet Resources
IT
Linux/Open Source
Personal Technology
Small Business
Windows Technology
xSP Resources
Search internet.com
Advertise
Corporate Info
Newsletters
Tech Jobs
E-mail Offers
commerce
  Be a Commerce Partner
 
 
 
 
 
 
 
 
 
 
 
 
 
 

solar fade
Last modified: Tuesday, April 13, 2004 

(n.) Also referred to as sun fade, sun outage or solar outage, a signal degradation phenomenon that affects the transmission of radio signals in satellite communications.

GEO satellites orbit the earth above the equator and rely on microwave signals in the radio frequency spectrum for communications with an earth-bound antenna. The sun also emits large amounts of electromagnetic energy in the microwave portion of the spectrum. Through the majority of the year, the radio frequency energy from the sun does not affect satellite communications. However, during the spring and fall equinoxes the sun is positioned above the earth's equator (in the equatorial plane) and therefore will align itself behind the GEO satellites as they move with the earth's rotation. When the sun is directly behind a satellite the radio signals of the satellite communications are overpowered by the sun's radio frequency energy, creating noise, and the communications are therefore disrupted.

Signal interference only occurs once a day for any satellite and usually lasts less than eight minutes, though many factors, including antenna size and downlink frequency, effect the duration and intensity of the solar fade. The exact date and time of solar fade is different for each satellite. Many satellite operators have solar fade calculators accessible on the Internet.

E-mail this definition to a colleague


For internet.com pages about solar fade . Also check out the following links!

Related Links

Solar Fade Calculator
An example of a solar fade calculator that one can use to determine the approximate date and time of a solar fade.

related categories

Satellite Communications

related terms

apogee

downlink

DSS

GEO

GPS

LEO

noise

perigee

transponder

uplink


webopedia
Give Us Your
Feedback


solar fade Products : Shop here to Save Money on Sunglasses at DealTime! Shop 100s of brands including Bolle, Oakley, DKNY, Gucci, Vuarnet & more!


Top Store Offers:
A Pair of Shades  37.90Frame Type: Sunglasses, Frame Material: Plastic, Lens Type: Resin Resin; U.V. Plano/Bifocal +1.50, +2.00, +2.50,
A Pair of Shades  29.90Frame Type: Sunglasses, Frame Material: Plastic, Lens Type: Acrylic Acrylic; U.V. Pl/Bifocal Grey Gradient, +1.00D, +,

Compare all matches:
0 Store Offers



JupiterWeb networks:

internet.comearthweb.comDevx.com graphics.com

Search JupiterWeb:

Jupitermedia Corporation has two divisions: Jupiterimages andJupiterWeb

Jupitermedia Corporate Info


Legal Notices, Licensing, Reprints, & Permissions, Privacy Policy.

Web Hosting | Newsletters | Tech Jobs | Shopping | E-mail Offers