Aurora...
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Who want to go watch in this December???
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Auroral mechanism
The aurora is now known to be caused by electrons of typical energy of 1-15 keV, i.e. the energy obtained by the electrons passing through a voltage difference of 1,000-15,000 volts. The light is produced when they collide with atoms of the upper atmosphere, typically at altitudes of 80-150 km. It tends to be dominated by emissions of atomic oxygen--the greenish line at 557.7 nm and (especially with electrons of lower energy and higher altitude) the dark-red line at 630.0 nm. Both these represent "forbidden" transitions of atomic oxygen from energy levels which (in absence of collisions) persist for a long time, accounting for the slow brightening and fading (0.5-1 sec) of auroral rays. Many other lines can also be observed, especially those of molecular nitrogen, and these vary much faster, revealing the true dynamic nature of the aurora.
Auroras can also be observed in the ultra-violet (UV) light, a very good way of observing it from space (but not from ground--the atmosphere absorbs UV). The Polar spacecraft even observed it in X-rays. The image is very rough, but precipitation of high-energy electrons can be identified.
(Extracted from wikipedia) -
i've been tellin my family i wanna see it.
but u have any details where to go and how, etc? they dont organize such tours right?
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No problem.. I will update you again and maybe organised a tour....Originally posted by sgquitter:i've been tellin my family i wanna see it.
but u have any details where to go and how, etc? they dont organize such tours right?
Will post more tomorrow.. Time to go home liao..
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where can u see it?
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go north of north american can see...Originally posted by OasisBlue:where can u see it? -
i rather watch anime.
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wah soO nice..sg haf meh?
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Aurora borealis usually occurs during September to October and March to April.
It is usually in the Autumn equinox and Spring equinox.
The occurance of Large magnetic storms are most common during the peak of the 11-year sunspot cycle, or during the 3 years after that peak.
Last aurora sighting is during 06-03-2005. Which means if we are to go in this year, our chance of viewing a magnificent aurora borealis is very slim.
Aurora borealis can only be located in the north solar wind, which means Countries like northern Europe and Canada are able to view them.
If we wanted to see the aurora, there is a tour package in Yellowknife might interest us.
Here is the website:
http://www.auroraworld.ca/english/tours/auroraviewing.html
First, we had to buy a return air ticket from SIA to Toronto (approx. SGD6500).
The travelling fee and misc. fee is about SGD700.
And the tour package might be SGD800, so total expenses estimated to be around SGD8000...
Wow! What an expensive tour!
So again, who is going?? -
Australia and some parts of America.Originally posted by OasisBlue:where can u see it?
Basically, the Southern and Northen most. -
On TV sure have.Originally posted by Princess livia:
wah soO nice..sg haf meh? 
But may have to pay to watch.