Sun outage

A sun outage is an interruption in or distortion of geostationary satellite signals caused by interference from solar radiation. The effect is due to the sun's radiation overwhelming the satellite signal. Generally, sun outages occur in February, March, September and October, that is, around the time of the equinoxes. At these times, the apparent path of the sun across the sky takes it directly behind the line of sight between an earth station and a satellite. As the sun radiates strongly at the microwave frequencies used to communicate with satellites (C-band and Ku-band) the sun swamps the signal from the satellite. The effects of a sun outage can include partial degradation, that is, an increase in the error rate, or total destruction of the signal.

Effect on Indian Stock Exchanges

NSE and BSE changed timings for various periods. The changed timings are tabled below:

September 24, 2008 to October 08, 2008

NSE Market timings during Sun Outage

Event	Duration
MARKET OPEN	09:55 AM to 11:25 AM
BREAK	11:25 AM to 12:10 PM
MARKET RESUME	12:10 PM to 04:15 PM
CLOSING SESSION	04:35 PM to 04:45 PM

BSE Market timings during Sun Outage

Event	Duration
MARKET OPEN	09:55 AM to 11:45 AM
BREAK	11:45 AM to 12:10 PM
MARKET RESUME	12:10 PM to 04:15 PM
CLOSING SESSION	04:15 PM to 04:45 PM

In India, the BSE (Bombay Stock Exchange) and NSE (National Stock Exchange) use VSATs (Very Small Aperture Terminal) for members to connect to their trading systems. VSATs ....

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