G2 Geomagnetic Storm

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Carbon60
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G2 Geomagnetic Storm

Post by Carbon60 »

After a recent spell of relative calm, finally a little geomagnetic activity.

Classed by NOAA as a G2 Geomagnetic Storm, my magnetometers showed a sharp up-tick last evening as Earth's magnetic field was impacted by a passing CME. This might be the late arrival of a CME launched by the collapse of a solar filament on August 15th, or some other minor CME ejected since then. In any case, beautiful aurora are being reported at high latitudes, according to Spaceweather.com
20140819 CME G2 Storm.jpg
20140819 CME G2 Storm.jpg (109.11 KiB) Viewed 2389 times
This one seems to have been a short-sharp-shock, as evidenced by the spike, so maybe the chances of further aurora this evening are minimal.

Thanks for looking.

Stu.


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Re: G2 Geomagnetic Storm

Post by grimble_cornet »

Great set of data Stu. Thanks for sharing.


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Re: G2 Geomagnetic Storm

Post by marktownley »

Very nice Stu!


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Re: G2 Geomagnetic Storm

Post by p_zetner »

Very cool, Stu.

There seems to be such a variety of time variations in these geomagnetic events. It's always interesting to see.

Cheers.
Peter.


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Re: G2 Geomagnetic Storm

Post by swisswalter »

Hi Stuart

a very fine catch


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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Re: G2 Geomagnetic Storm

Post by Carbon60 »

Thanks guys.

Peter, events vary, as you point out; some last days and some only hours. I guess it depends on the size and structure of the CME and whether it is a glancing blow or direct hit. This one seemed particularly short-lived.

Thanks for your interest.

Stu.


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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Re: G2 Geomagnetic Storm

Post by p_zetner »

Hi Stu.

I ran across this discussion of geomagnetic storms while reading "Observing the Sun" by Peter Taylor. If you're not already familiar, I thought you'd be interested.

"The geomagnetic storms which are associated with aurorae are most apt to occur around the Spring and Fall (autumn) equinoxes when the Earth is in a position which is more likely to intercept the Sun's highly directional emissions (Figure 5.4). Since the growth of large sunspot groups beneath coronal holes seems to suppress aurorae, they appear more frequently in high latitudes during the declining portion of a spot cycle. On the other hand, flare-generated aurorae are more common near the maximum phase of the sunspot cycle when the number of solar flares is also greatest. Even so, the most spectacular of the low latitude events often occur a year of so before or after spot maximum when the greatest of the solar flares erupt (Zirin, 1988). "

The reference is to Zirin's textbook and figure 5.4 is attached.

Cheers.
Peter.
geomag_monthly.jpg
geomag_monthly.jpg (108.26 KiB) Viewed 2347 times


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Re: G2 Geomagnetic Storm

Post by marktownley »

An interesting addition Peter, i'm off to Iceland in october for a weeks aurora hunting, so hopefully there will be plenty to see then.


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Re: G2 Geomagnetic Storm

Post by swisswalter »

Ah Mark :mrgreen: :mrgreen: :mrgreen:

don't you have a tiny space in the luggage ?


Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)
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Re: G2 Geomagnetic Storm

Post by Carbon60 »

p_zetner wrote:Hi Stu.

I ran across this discussion of geomagnetic storms while reading "Observing the Sun" by Peter Taylor. If you're not already familiar, I thought you'd be interested.

"The geomagnetic storms which are associated with aurorae are most apt to occur around the Spring and Fall (autumn) equinoxes when the Earth is in a position which is more likely to intercept the Sun's highly directional emissions (Figure 5.4). Since the growth of large sunspot groups beneath coronal holes seems to suppress aurorae, they appear more frequently in high latitudes during the declining portion of a spot cycle. On the other hand, flare-generated aurorae are more common near the maximum phase of the sunspot cycle when the number of solar flares is also greatest. Even so, the most spectacular of the low latitude events often occur a year of so before or after spot maximum when the greatest of the solar flares erupt (Zirin, 1988). "

The reference is to Zirin's textbook and figure 5.4 is attached.

Cheers.
Peter.
geomag_monthly.jpg
Many thanks for this, Peter.

Interesting info. I'll check out his book.

Cheers

Stu


H-alpha, WL and Ca II K imaging kit for various image scales.
Fluxgate Magnetometers (1s and 150s Cadence).
Radio meteor detector.
More images at http://www.flickr.com/photos/solarcarbon60/
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