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The solar wind is currently almost non existent

 
Ossie bloke
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12/04/2009 04:42 AM
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The solar wind is currently almost non existent
PRESTO FROM SIDC - RWC BELGIUM Thu Dec 3 2009, 1247 UT

Except for a small magnetic dipole just passing the East limb in Extreme-UV images (probably a plage without sunspots), the Sun is featureless and is expected to remain inactive. Since early today, the solar wind has virtually vanished, reaching exceptionally low speeds (now at 250 km/s), low densities (< 0.1 electron/cm3) and low plasma temperatures (< 10&#8308; K), based on ACE and SOHO/MTOF data. This leads also to exceptionally quiet geomagnetic conditions (Kp=0 at many ground stations). Those extremely quiet conditions certainly deserve special study. Only a weak solar wind stream expected tomorrow or on Dec.5 could restore more normal conditions, but just inducing temporarily unsettled geomagnetic conditions.

[link to sidc.oma.be]



[link to www.swpc.noaa.gov]
Anonymous Coward
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12/04/2009 04:54 AM
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Re: The solar wind is currently almost non existent
It probably accounts for the rise in Cosmic Rays we've been seeing. I think it's going to get cold...

Sun is extremely quiet.
Anonymous Coward
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12/04/2009 05:00 AM
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Re: The solar wind is currently almost non existent
I think it's going to get cold...
 Quoting: Anonymous Coward 832516



They're expecting one of the coldest winters ever here in the UK, forgetting, of course, the Little Ice Age, th Ice Age itself, the period after WW2 with really harsh winters.

Honestly, folks, you can't make it up.
Anonymous Coward
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12/04/2009 05:02 AM
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Re: The solar wind is currently almost non existent
PIN

THIS MAY HAVE EPIC CONSEQUENCES.
Ossie bloke  (OP)

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12/04/2009 05:14 AM
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Re: The solar wind is currently almost non existent
It probably accounts for the rise in Cosmic Rays we've been seeing. I think it's going to get cold...

Sun is extremely quiet.
 Quoting: Anonymous Coward 832516

There hasn't been a rise in Cosmic Rays in recent days, nor should one be expected as a result of this dramatic stoppage of the solar wind. It takes several months for variations in the solar wind to reach the heliopause where the deflection of cosmic rays is believed to occur.
Anonymous Coward
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12/04/2009 06:48 AM
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Re: The solar wind is currently almost non existent
It probably accounts for the rise in Cosmic Rays we've been seeing. I think it's going to get cold...

Sun is extremely quiet.

There hasn't been a rise in Cosmic Rays in recent days, nor should one be expected as a result of this dramatic stoppage of the solar wind. It takes several months for variations in the solar wind to reach the heliopause where the deflection of cosmic rays is believed to occur.
 Quoting: Ossie bloke


Actually, both deflect the Cosmic Rays (It was reported on GLP yesterday that we had seen a rise, and what better source is there :)

The flux (flow rate) of cosmic rays incident on the Earth’s upper atmosphere is modulated (varied) by two processes; the sun’s solar wind and the Earth's magnetic field. Solar wind is expanding magnetized plasma generated by the sun, which has the effect of decelerating the incoming particles, as well as excluding some of the particles with energies below about 1 GeV. The amount of solar wind is not constant due to changes in solar activity, for instance over its regular eleven-year cycle. Hence the level of modulation varies in anticorrelation with solar activity. Also the Earth's magnetic field deflects some of the cosmic rays, giving rise to the observation that the intensity of cosmic radiation is dependent on latitude, longitude and azimuth. The cosmic flux varies from eastern and western directions due to the polarity of the Earth’s geomagnetic field and the positive charge dominance in primary cosmic rays; this is termed the east-west effect. The cosmic ray intensity at the equator is lower than at the poles as the geomagnetic cutoff value is greatest at the equator. This is because charged particles tend to move in the direction of field lines and not across them, so that they are concentrated in the polar regions (where field lines are closest together). This is the reason the aurorae occur at the poles, since the field lines curve down towards the Earth’s surface there. Finally, the longitude dependence arises from the fact that the geomagnetic dipole axis is not parallel to the Earth’s rotation axis.

This modulation which describes the change in the interstellar intensities of cosmic rays as they propagate in the heliosphere is highly energy and spatial dependent, and it is described by the Parker's Transport Equation in the heliosphere. At large radial distances, far from the Sun (~94 AU), there exists the region where the solar wind undergoes a transition from supersonic to subsonic speeds called the solar wind termination shock. The region between the termination shock and the heliopause (the boundary marking the end of the heliosphere) is called the heliosheath. This region acts as a barrier to cosmic rays, decreasing their intensity at lower energies by about 90%; thus it is not only the Earth's magnetic field that protects us from cosmic ray bombardment.
Anonymous Coward
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12/04/2009 06:57 AM
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Re: The solar wind is currently almost non existent
A NASA page on the subject:

[link to imagine.gsfc.nasa.gov]

Galactic cosmic rays (GCRs) are the high-energy particles that flow into our solar system from far away in the Galaxy. GCRs are mostly pieces of atoms: protons, electrons, and atomic nuclei which have had all of the surrounding electrons stripped during their high-speed (almost the speed of light) passage through the Galaxy. Cosmic rays provide one of our few direct samples of matter from outside the solar system. The magnetic fields of the Galaxy, the solar system, and the Earth have scrambled the flight paths of these particles so much that we can no longer point back to their sources in the Galaxy. If you made a map of the sky with cosmic ray intensities, it would be completely uniform.
Anonymous Coward
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12/04/2009 07:14 AM
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Re: The solar wind is currently almost non existent
popcorn
Anonymous Coward
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12/04/2009 07:53 AM
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Re: The solar wind is currently almost non existent
We are seeding the clouds with chemicals to help absorb the radiation bombarding us from space?
Anonymous Coward
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12/04/2009 09:25 AM
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Re: The solar wind is currently almost non existent
it all bodes ill...
Anonymous Coward
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12/04/2009 09:28 AM
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Re: The solar wind is currently almost non existent
Dec. 13, 1999: From May 10-12, 1999, the solar wind that blows constantly from the Sun virtually disappeared -- the most drastic and longest-lasting decrease ever observed.

Dropping to a fraction of its normal density and to half its normal speed, the solar wind died down enough to allow physicists to observe particles flowing directly from the Sun's corona to Earth. This severe change in the solar wind also changed the shape of Earth's magnetic field and produced an unusual auroral display at the North Pole.

[link to science.nasa.gov]
Anonymous Coward
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12/04/2009 09:32 AM
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Re: The solar wind is currently almost non existent
Bitter winter on its way for NE USA and Canada. Mark my words, and stock up on fuel,food,water etc...
Anonymous Coward
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12/04/2009 09:33 AM
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Re: The solar wind is currently almost non existent
[link to www.swpc.noaa.gov]
this is bizarre, too
Hickory

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12/04/2009 09:38 AM
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Re: The solar wind is currently almost non existent
[link to www.swpc.noaa.gov]
this is bizarre, too
 Quoting: Anonymous Coward 790847

I wish I could understand these graphs. scratching
You have one life. Live it.
You have one voice, use it.
You have one
:Hickory-1:
Anonymous Coward
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12/04/2009 09:40 AM
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Re: The solar wind is currently almost non existent
"There is a constant stream of high-energy galactic and solar radiation interacting with the Earth’s upper atmosphere. This interaction creates a cascade of secondary particles. Some of the secondary particles, in particular neutrons, can affect aircraft avionic systems."
Aviation Safety Investigation Report - Interim Factual
In-flight upset, VH-QPA, Airbus A330-303, 154 km west of Learmonth, Western Australia, 7 October 2008

[link to atsb.gov.au]
Anonymous Coward
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12/04/2009 09:40 AM
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Re: The solar wind is currently almost non existent
bump
Anonymous Coward
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12/04/2009 10:22 AM
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Re: The solar wind is currently almost non existent
There hasn't been a rise in Cosmic Rays in recent days, nor should one be expected as a result of this dramatic stoppage of the solar wind. It takes several months for variations in the solar wind to reach the heliopause where the deflection of cosmic rays is believed to occur.
 Quoting: Ossie bloke



oh there was something but ..........they edited it out...
Ossie bloke  (OP)

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12/05/2009 09:41 PM
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Re: The solar wind is currently almost non existent
The solar wind finally recovered 10 hours ago after a 5 day hiatus.

[link to www.swpc.noaa.gov]


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[link to s234.photobucket.com]





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