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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.
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Carbon60
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by Carbon60 » Sun Jul 05, 2015 3:02 pm
Hi all,
June proved to be quite a geomagnetically lively month, courtesy of AR2371 which unleashed a number of CMEs, including a large Earth directed CME on June 21st, sparking an impressive G4 geomagnetic storm as it impacted our magnetic bubble on 22nd/23rd. This was the largest solar storm to date this solar cycle.
As can be seen from the chart, other more minor events also took place during the month, including one originating from fast flowing solar wind spewing from a hole in the solar corona, to several from side-swiping CMEs.
Thanks for looking.
Stu.
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marktownley
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by marktownley » Sun Jul 05, 2015 3:28 pm
An excellent overview of the month!
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p_zetner
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by p_zetner » Sun Jul 05, 2015 3:36 pm
Thanks, Stu.
Are you noticing an overall decline in the number and intensity of events with respect to last year or the year before?
Cheers.
Peter.
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Montana
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by Montana » Mon Jul 06, 2015 2:05 pm
Putting it into context with all the others that was a big one!!
Great presentation.
Alexandra
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highfnum
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by highfnum » Mon Jul 06, 2015 2:45 pm
i gotta start learningabout this
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Carbon60
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by Carbon60 » Tue Jul 07, 2015 1:14 pm
Thanks everyone.
Peter, certainly the more intense ones to reach us have been more recent, but we'd have to look at the data on all CMEs over time from all parts of the Sun to say more about any such trends.
Stu.
