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APOD: Northern Green Flash (2012 Jun 23)
Posted: Sat Jun 23, 2012 4:06 am
by APOD Robot
Northern Green Flash
Explanation: As seen from
Frösön island in northern Sweden the Sun did set a day after the
summer solstice. From that location below the
arctic circle it settled slowly behind the northern horizon. During the sunset's final minute,
this remarkable sequence of 7 images follows the distorted edge of the solar disk as it just disappears against a distant tree line, capturing both a
green and blue flash.
Not a myth even in a land
of runes, the colorful but elusive glints are caused by atmospheric refraction enhanced by long, low, sight lines and strong atmospheric temperature gradients.
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Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Sat Jun 23, 2012 4:11 am
by Beyond
ooh! What a set of pictures!
![clapping :clap:](./images/smilies/asterisk_clap.gif)
Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Sat Jun 23, 2012 6:20 am
by saturno2
Coincidentally, in the afternoon I was invited to a meeting at the branch of
a famous Sweden Home fragance.
Now, APOD described the Sun as seen from Sweden
Perfum and Sun of Sweden!!
Full beautiful
Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Sat Jun 23, 2012 12:43 pm
by biddie67
Spectacular sequence of pictures!!
Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Sat Jun 23, 2012 4:25 pm
by sage
![clapping :clap:](./images/smilies/asterisk_clap.gif)
Beautiful!
Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Sat Jun 23, 2012 4:49 pm
by aldenrw
Huh. 'Ellusive.' I don't know that word.
Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Sat Jun 23, 2012 7:10 pm
by canesvenatici
Probably "elusive" -- difficult to grasp.
Wonderful images.
Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Mon Jun 25, 2012 3:30 pm
by Fumblina
As far north as Sweden is, I believe the sun would appear to set much more slowly than at, say, the equator. Does it follow therefore that the green "flash" would be longer lasting (ergo easier to see) in the far north?
Re: APOD: Northern Green Flash (2012 Jun 23)
Posted: Mon Jun 25, 2012 9:12 pm
by Anthony Barreiro
Fumblina wrote:As far north as Sweden is, I believe the sun would appear to set much more slowly than at, say, the equator. Does it follow therefore that the green "flash" would be longer lasting (ergo easier to see) in the far north?
Your suggestion makes sense to me: the Sun sets at a more oblique angle farther north (or south) of the equator, so the disk of the Sun would take longer to set behind the horizon, so the conditions that create the green flash would last longer.