Sun outage
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A Sun outage, Sun transit, or Sun fade is an interruption in or distortion of geostationary satellite signals caused by interference (background noise) of the Sun when it falls directly behind a satellite which an Earth station is trying to receive data from or transmit data to. It usually occurs briefly to such satellites twice per year and such Earth stations install temporary or permanent guards to their receiving systems to prevent equipment damage.
Sun outages occur before the
Effect on Indian stock exchanges
In India, the BSE (Bombay Stock Exchange) and NSE (National Stock Exchange) use VSATs (Very Small Aperture Terminals) for members (e.g. stockbrokers) to connect to their trading systems. VSATs depend upon satellites for connectivity between the terminals/systems. Hence, these exchanges are, with considerable predictability, affected by the annual Sun outages. Both typically close from 11:45 to 12:30 during "Sun outages" — times vary depending on the Earth's orbit and satellites' exact locations. The interference to satellites' signals has been shown to disturb smooth transmission of data of online transactions so, for fairness, these share markets are closed for these short times each year. Trading is normally extended the same day to compensate for the lost time.
Other locations
Saint Helena suffers from island-wide loss of Internet and telecommunications connections during Sun outages because all telecommunications traffic to and from the island is carried on a single satellite link. Sun outage times are published in local newspapers.
As the majority of rural
See also
- Satellite warfare
- Solar transit