Change in market timings due to Sun Outage

Monday, March 3, 2008

Change in market timings due to Sun Outage

Due to heavy solar activity, the VSAT services are likely to be disrupted from March 04, 2008 to March 18, 2008 (both days inclusive).

Revised trading session timings for Equity and Derivatives Segment, March 04, 2008 to March 18, 2008 (both days inclusive) are as follows:

Session                             Start Time       End Time
Continuous                          9 : 55 a.m.      11 : 45 a.m.
No trading due to Sun Outage 11 : 45 a.m. 12 : 30 p.m.
Resumption of Continuous Session 12 : 30 p.m. 4 : 15 p.m.

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.

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