Shashidhar
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- 1 Jun 2013
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Sun Outage during March-2014 for RDTV Reception
“Sun outage” is a natural phenomena which occurs twice a year for about 10 days and it affects ‘all’ communication/broadcast satellite services. This is an interruption of geostationary satellite signals caused by the interference from solar radiation. The service disruption effect is due to sun's radiation overwhelming the satellite signal.
Generally, sun outages occur in March and September/October every year, 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/receive station and a satellite. As the sun radiates strongly at the microwave frequencies, that are used to communicate with satellites (C-band, Ku-band, etc.,), the sun swamps the signal from the satellite. That is, during Sun outage, the satellite signals will be buried under Sun Noise and hence the communication and TV Signal Reception get affected. The effects can include partial degradation, that is, an increase in the error rate, or total destruction of the satellite signal.
In case of RDTV Reception from Measat-3 satellite located at 91.5˚E, the sun outage in Vernal equinox happens for about 10 days in March 2014. The duration of outage may vary from 5 to 15 minutes a day for 60 cms receive dishes; larger dishes will experience lesser duration of outage due to narrow beamwidth. The actual outage may differ slightly from the predicted timings/durations.
Predicted dates, timings and duration of the outage for Reception using 60 cms dish for Typical / Representative Indian Cities / Locations are given in the Annexure; the start and stop timings indicated are prediction windows during which the Sun Outage may occur.
:angry
“Sun outage” is a natural phenomena which occurs twice a year for about 10 days and it affects ‘all’ communication/broadcast satellite services. This is an interruption of geostationary satellite signals caused by the interference from solar radiation. The service disruption effect is due to sun's radiation overwhelming the satellite signal.
Generally, sun outages occur in March and September/October every year, 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/receive station and a satellite. As the sun radiates strongly at the microwave frequencies, that are used to communicate with satellites (C-band, Ku-band, etc.,), the sun swamps the signal from the satellite. That is, during Sun outage, the satellite signals will be buried under Sun Noise and hence the communication and TV Signal Reception get affected. The effects can include partial degradation, that is, an increase in the error rate, or total destruction of the satellite signal.
In case of RDTV Reception from Measat-3 satellite located at 91.5˚E, the sun outage in Vernal equinox happens for about 10 days in March 2014. The duration of outage may vary from 5 to 15 minutes a day for 60 cms receive dishes; larger dishes will experience lesser duration of outage due to narrow beamwidth. The actual outage may differ slightly from the predicted timings/durations.
Predicted dates, timings and duration of the outage for Reception using 60 cms dish for Typical / Representative Indian Cities / Locations are given in the Annexure; the start and stop timings indicated are prediction windows during which the Sun Outage may occur.
:angry
