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.
IT Solutions Builder TOP IT RESOURCES TO MOVE YOUR BUSINESS FORWARD
Which topic are you interested in?
What is your company size?
What is your job title?
What is your job function?
Searching our resource database to find your matches...
Stay up to date on the latest developments in Internet terminology with a free newsletter from Webopedia. Join to subscribe now.
From A3 to ZZZ we list 1,559 text message and online chat abbreviations to help you translate and understand today's texting lingo. Includes Top... Read More »Huge List of Computer Certifications
Have you heard about a computer certification program but can't figure out if it's right for you? Use this handy list to help you decide. Read More »
Computer architecture provides an introduction to system design basics for most computer science students. Read More »Network Fundamentals Study Guide
Networking fundamentals teaches the building blocks of modern network design. Learn different types of networks, concepts, architecture and... Read More »The Five Generations of Computers
Learn about each of the five generations of computers and major technology developments that have led to the computing devices that we use... Read More »