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Post by lsvalgaard on Dec 7, 2010 14:46:24 GMT
miedosoracing> ... Very cool. Yes, it is. Almost looks like there is some kind of "connection" between the filament and that Helium II cloud. But the filament is visible at many wavelengths, the cloud is much stealthier, can only be seen in 304A and microwaves. So, optical illusion or connection? There's a story posted with that video at spaceweather.com, but they don't mention the He II cloud: "EPIC BLAST: As predicted, the a "mega-filament" of solar magnetism erupted on Dec. 6th, producing a blast of epic proportions. NASA's Solar Dynamics Observatory recorded the action as the 700,000-km long structure lifted off the stellar surface and--snap!!--hurled itself into space. Click on the arrow to play the movie:" That means it's been there for a day or so. Going back to 6-Dec Nobeyama I can see it there too. So perhaps it's the "splash" of the filament re-entering the solar atmosphere? On the other side of the Sun! But that still doesn't explain why the cloud has lingered so long, a day after the filament itself has disappeared. It is common that the filament [or cloud] reforms in more or less the same place after an eruption. The filament can erupt several times. The basic magnetic pattern is still there [as it is rooted in the much denser photosphere and below]. |
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Post by af4ex on Dec 7, 2010 16:58:02 GMT
@leif > It is common that the filament [or cloud] reforms > in more or less the same place after an eruption. In this case it looks like the cloud-part (green) is settling on the far side of the Sun, and persisting long after the filament (red) has subsided. Just checked the latest 304A imagery and that cloud is still hanging over the SE limb. No sign of a filament. Attachments:
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Post by lsvalgaard on Dec 7, 2010 17:45:37 GMT
@leif > It is common that the filament [or cloud] reforms > in more or less the same place after an eruption. In this case it looks like the cloud-part (green) is settling on the far side of the Sun, and persisting long after the filament (red) has subsided. Just checked the latest 304A imagery and that cloud is still hanging over the SE limb. No sign of a filament. Cloud, prominence, filaments are all the same things, just seen from different angles. |
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Post by af4ex on Dec 7, 2010 18:45:40 GMT
@leif > Cloud, prominence, filaments are all the same things, > just seen from different angles. Leif, I think you're missing the main point: the "cloud" on the SE limb can only be seen in 304A and microwave wavelengths. Whereas the the main filament (Theo's "filaprom") on 6-Dec showed up in many wavelengths (including Theo's optical images). So the 304A clouds and the 6-Dec filament can't be the same things, can they? Look at the current 304A image. The "cloud" that we're talking about is that 'bump' on the SE limb. It doesn't show up in any other wavelength, except microwaves (17Ghz). But it seems to have 'connected' to the main filament of that 6-Dec event. umbra.nascom.nasa.gov/eit/images/latest_eit_304_full.gif |
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Post by lsvalgaard on Dec 7, 2010 18:54:45 GMT
@leif > Cloud, prominence, filaments are all the same things, > just seen from different angles. Leif, I think you're missing the main point: the "cloud" on the SE limb can only be seen in 304A and microwave wavelengths. Whereas the the main filament (Theo's "filaprom") on 6-Dec showed up in many wavelengths (including Theo's optical images). So the 304A clouds and the 6-Dec filament can't be the same things, can they? Look at the current 304A image. The "cloud" that we're talking about is that 'bump' on the SE limb. It doesn't show up in any other wavelength, except microwaves (17Ghz). But it seems to have 'connected' to the main filament of that 6-Dec event. umbra.nascom.nasa.gov/eit/images/latest_eit_304_full.gifyes they can. Different wavelengths show different temperatures. The Sun's gravity is very strong [27 times stronger than Earth's] so everything that is not held up by strong magnetic fields falls down hard [you can see that downfall on the lifting off movies at the end of each eruption]. The strong magnetic fields connect opposite polarity areas in the photosphere and provide the support for clouds, prominences, etc, that 'hang' in the field. If the cloud is on the disk it will absorb emission from hydrogen and show up dark in H-alpha and we call it a filament. |
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Post by af4ex on Dec 7, 2010 19:09:50 GMT
Ok, I guess what you're saying is that we can't always believe what our eyes "see". I'll buy that. Do you agree that the "304A cloud" (below) is hanging over the far side of the Sun? (because the edge of the limb can be seen) Or is that another optical illusion? Attachments:
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Post by lsvalgaard on Dec 7, 2010 20:12:12 GMT
Ok, I guess what you're saying is that we can't always believe what our eyes "see". I'll buy that. Do you agree that the "304A cloud" (below) is hanging over the far side of the Sun? (because the edge of the limb can be seen) Or is that another optical illusion? it is hanging near the limb [the border between the near side and the far side  ]. |
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Post by af4ex on Dec 7, 2010 20:59:19 GMT
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Post by THEO BAKALEXIS on Dec 8, 2010 14:38:38 GMT
Two closed views from the regions 1133 and 1131 today.   |
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Post by af4ex on Dec 9, 2010 1:20:58 GMT
@theo > Two closed views from the regions 1133 and 1131 today. Beautiful images, Theo, thanks. Looking at the Xray Imager (below) these two spots, and the old 1123/1121 region, are less bright than they were a few days ago, which is consistent with the observation that the GOES Xray background has slid down to slightly under B-class level. Looks like all the excitement is over for now. Attachments:
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Post by af4ex on Dec 9, 2010 14:17:49 GMT
The solar globe has rotated a bit since 7-Dec, so I think we can now see that post-prominence area where 304A Cloud was hanging over the 7-Dec SE limb. Do I have the correct location? It looks a bit dimmer (seen here in the 304A EUV wavelength) than the surrounding area. Why is that? Perhaps the Helium II (which gives off 304A when it's excited) has been 'depleted' in some sense (ejected into the corona)? Attachments:
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Post by Bob k6tr on Dec 10, 2010 2:07:43 GMT
Some spots are starting to form just downwind of the area where the Big Filament was in the Southern Hemisphere. The area is due south of 1133. Take a close look on the SDO Intensity Photo.
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Post by af4ex on Dec 10, 2010 2:55:52 GMT
Bob k6tr> Some spots are starting to form .... The area is > due south of 1133. They're very tiny, Bob, but I can see them. Attachments:
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Post by af4ex on Dec 10, 2010 3:02:00 GMT
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Post by af4ex on Dec 11, 2010 12:45:01 GMT
The predicted fast solar wind has not arrived, current speed is under 400 km/sec. The K-Index is flatlined, and the Canadian magno chain shows virtually no activity (below). But the Solen forecast says that "occasional active intervals are possible". Watching paint dry is more exciting (but not as enlightening). :-| Attachments:
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