Solar Transit Phenomenon - Canadian TV, Computing and Home Theatre Forums
 
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post #1 of 10 (permalink) Old 2009-02-25, 04:54 PM Thread Starter
 
Join Date: Jul 2003
Location: Kamloops B.C.
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Solar Transit Phenomenon

Its that Time again

st an FYI folks)...no response required

Solar Transit Phenomenon

February 25th- March 6th, 2009

Why:

Between February 25th and March 6th, Star Choice satellite viewers may be affected by interference due to a phenomenon which is unique to the satellite world, called "sun transit''.

Sun Transits are an unavoidable satellite service degradation that occurs every Spring and Autumn. At these times, the sun passes directly behind the satellite causing solar noise on satellite services for up to twenty minutes a day, up to 10 consecutive days. The customer may experience a loss of signal and/or picture during this phenomenon.

Customer Impact:

Customers should be informed that the technical difficulties will be temporary and are completely out of Star Choice’s control. No one should adjust their dish during this period. Signals will return to normal. Dish peaking, subscriber activation’s and signal troubleshooting should be discouraged during this period.

Key Information:

The dates and times predicted for Anik F1 Star Choice reception problems are listed as follows in local time:

Location
Start
End
Dates

Vancouver, BC
1:09 pm
1:19 pm
Feb 26-Mar4

Calgary, AB
2:13 pm
2:24 pm
Feb 25-Mar4

Winnipeg, MB
3:20 pm
3:27 pm
Feb 26-Mar4

Toronto, ON
4:28 pm
4:38 pm
Feb 28-Mar 6

Montreal, PQ
5:30 pm
5:40 pm
Feb 28-Mar 5

St. John’s, NL
6:06 pm
6:16 pm
Feb 28-Mar 5

The dates and times predicted for Anik F2 Star Choice reception problems are listed as follows in local time:

Location
Start
End
Dates

Vancouver, BC
1:26 pm
1:36 pm
Feb 26-Mar4

Calgary, AB
2:04 pm
2:15 pm
Feb 25-Mar4

Winnipeg, MB
3:37 pm
3:47 pm
Feb 26-Mar4

Toronto, ON
4:45 pm
4:55 pm
Feb 28-Mar 6

Montreal, PQ
5:47 pm
5:57 pm
Feb 28-Mar 5

St. John’s, NL
6:22 pm
6:32 pm
Feb 28-Mar 5

CSR/TSR How To:

CSR’s/TSR’s should advise our customers that this is a temporary loss of signal and it should return to normal shortly. We should refrain from troubleshooting signal loss during which the scheduled “sun transit” is occurring as signal strength readings will be unreliable.

Q & A:

Q: Are other television providers affected by sun transit?

A: Yes. Any provider that receives their programming from satellite will be affected.

Q: How many times a year does sun transit occur?

A: Generally, sun transit occurs twice a year (Spring and Fall).

Q: If a customer is experiencing technical issues for longer than the predicted outage, what should we do?

A: Customers should not see an interruption of service for any longer than 25-30 minutes. If the loss of service is continuing after this time frame, please troubleshoot according to loss of service guidelines. (SPOT à Technical à Troubleshooting Guidelines).

Last edited by 57; 2009-02-25 at 07:00 PM. Reason: Spacing removed.
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post #2 of 10 (permalink) Old 2009-02-25, 06:49 PM
 
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Location: Muskoka, Ontario
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Aren't we currently in winter?
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post #3 of 10 (permalink) Old 2009-02-25, 08:22 PM
 
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Location: Ontario
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I think you should check those calculations. For example, Toronto should experience degradation on Anik F1 starting at 2:30 PM eastern time tomorrow.

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post #4 of 10 (permalink) Old 2009-02-25, 08:42 PM
 
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Location: Drayton Valley, Alberta
Posts: 353
you should probably subtract 2 hours from all those times and also swap the times given for f1 and f2 as well. f2 is west of f1 so it's sun transit time should be about 15 minutes later than f1. it looks like the time for st. john's is after sunset? 4 pm sounds more like it.
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post #5 of 10 (permalink) Old 2009-02-26, 05:06 PM
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Quote:
Originally Posted by smp01 View Post
Aren't we currently in winter?
Yes, but it has nothing to do with weather.

Solar transit is what happens when the sun appears directly behind the satellite, as the earth tilts back and forth and rotates. It only happens twice in the year. The radiation emitted by the sun will fight with the signal from a satellite and likely cause a no-signal condition.

Being the sun will shine from exactly where a satelltie is, you can use that phenomenon to choose where to possobly install a satellite dish.
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post #6 of 10 (permalink) Old 2009-02-26, 07:12 PM
 
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The earth does not tilt back and forth. It revolves around the sun and happens to be tilted. Small point I know but I don't want it to tilt back and forth as I may not be able to hang on.
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post #7 of 10 (permalink) Old 2009-02-26, 07:21 PM
57
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If you can hang on while it's turning at over 1600 kph, then you could hang on while it "tilts" at 1kph (even though it doesn't).

It'd be nice if we had the correct transit times, but at least people know roughly...

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post #8 of 10 (permalink) Old 2009-02-26, 07:26 PM
 
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Location: Drayton Valley, Alberta
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the satellites are directly above the equator and so the sun can pass behind them from our point of view when the sun is also directly above the equator on march 21 and september 21st. we are a long ways north of the equator though, so the angle we are looking from here lines up with the satellites and the sun much earlier than the first day of spring and much later than the first day of fall. if you are in the southern hemisphere that would be reversed with the sun transit happening later than march 21 and earlier than september 21st.
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post #9 of 10 (permalink) Old 2009-02-26, 07:38 PM
57
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For those wishing to calculate the solar transits for their latitude/longitude, someone was kind enough to PM me this link.

http://www.telesat.ca/en/Sun_Transit_Calculator Note that the times are GMT.

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post #10 of 10 (permalink) Old 2009-02-27, 08:33 AM
 
Join Date: Dec 2004
Location: Muskoka, Ontario
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Quote:
Originally Posted by classicsat View Post
Yes, but it has nothing to do with weather.
I was making fun of the fact that the article twice refers to Spring and Autumn.
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