October 9, 2009
Posted: 703 GMT

HONG KONG, China — “Sun Outage” is a phrase that means something to someone working in the Satellite and Television Industries.

When you are sitting at home watching television, there is a good chance that the CNN on your screen has traveled around the world via satellites. These satellites are geo-stationary, which means they hover over the same piece of Earth all the time, in fact they are rotating at the same speed as the Earth to achieve this.

A ‘sun outage’ is similar to a solar eclipse – when the moon blocks out the daytime sun – except this time that pesky sun gets behind our satellite.

The satellites we use are effectively giant reflectors of radio waves that carry our television signals. The radio waves get sent from one part of the world and reflected back to another part of the world, often ending up in another continent. Typically space is a quiet place. However, the sun is a very noisy thing, emitting all sorts of radio wavelengths at high amplitude.

Thus, when the sun gets behind our satellite - albeit only for a few minutes a year (and we just finished our last sun outage period on Thursday) – it swamps all the radio waves with its solar noise. So we, along with others, lose our signal in that noise.

It is a bit like trying to have a conversation with your friend in front of a set of rock concert speakers - deafening and impossible to hear anything. Anyway, if your picture goes on the blink and you hear the phrase ‘sun outage’ then sit tight, make a cup of tea and do not adjust your set.

Normal service will resume when our lovely sun meanders on.

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Filed under: General


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woofbarkenarf   October 12th, 2009 2349 GMT

I work in the industry. Thank you Matthew!

There are still many people who will not believe a word of it when I explain this to them.

To illustrate I take out a paperclip, hold it up in front of the window, and ask them do you see it? Then I hold it in front of a lightbulb that is turned on and....you get the picture. Hopefully this explanation of yours will lend some believability to the problem.

SUNGOD   October 13th, 2009 2128 GMT

it seems that thier was no nefarious intent or signal block, I dont understand why people would think there was, sometimes stuff just happens. I would hope the people of Cnn. knowing that an event like this may take place, would run the material again as soon as the outage was done. in all fairness, it is only right?

John Nashville   October 16th, 2009 1824 GMT

It would be better if the article referred to all the people who don't have tv because the goverment got involved.

Doug   October 17th, 2009 703 GMT

Silly question, but it sounds like the broadcasters didn't announce this was going to happen before it did. Did they? I certainly don't mind running off to make some tea... A little "good bye for 5 minutes" would certainly be welcome if not done already!

Nice description of what happened without mentioning technical jargon like SNR and such.

Stephen Miller   October 17th, 2009 1334 GMT

They are not "rotating at the same speed as the earth". They are "orbiting" at the same rate the earth rotates.

robincruz   October 19th, 2009 1203 GMT

Ideally CNN should inform people before the event if it s it possible to predict when it is likely to happen.

mark brown   November 1st, 2009 355 GMT

technology is gonna kill us all anyways who cares. get cable and youll be better off

Aaron   November 6th, 2009 2201 GMT

@mark brown: Are you for real? You want CNN to string a cable from Atlanta, Georgia all the way to Hong Kong? This is not satellite TV they're talking about - they're talking about linking stations around the world via satellite. The amount of cable needed to do that would be unfathomable and completely impractical. Please keep your uninformed comments to yourself.

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