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Post by af4ex on Nov 3, 2010 17:18:09 GMT
As of 1300Z, about 6 hours after the first flare it doesn't look like Old 1112 had officially appeared on the disk visible from Earth (or SOHO's L1 orbit) solarmonitor.org/full_disk.php?date=20101103&type=smdi_igram&indexnum=1So it looks like I did 'jump the gun' a bit by prematurely announcing that Old 1112 had appeared. Sorry. But the flare itself was visible in Japan (see Nobeyama movie) [and also by GOES-15], so what is going on here? I see three possibilities. 1. The flare occurred in a region West of Old 1112, which had crossed over the limb. 2. The flare occurred within Old 1112, but the explosion extended upward 50,000km or so, such that the "fireball" was visible from earth. (See region between green lines below). 3. Same as #2 but the RF radiation refracted or scattered over the horizon (like VHF tropo-scatter on Earth). Can Leif, or some other experts, clarify this for us? Thanks, John/af4ex Attachments:
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Post by lsvalgaard on Nov 3, 2010 18:30:51 GMT
As of 1300Z, about 6 hours after the first flare it doesn't look like Old 1112 had officially appeared on the disk visible from Earth (or SOHO's L1 orbit) solarmonitor.org/full_disk.php?date=20101103&type=smdi_igram&indexnum=1So it looks like I did 'jump the gun' a bit by prematurely announcing that Old 1112 had appeared. Sorry. But the flare itself was visible in Japan (see Nobeyama movie), so what is going on here? I see three possibilities. 1. The flare occurred in a region West of Old 1112, which had crossed over the limb. 2. The flare occurred within Old 1112, but the explosion extended upward 50,000km or so, such that the "fireball" was visible from earth. (See region between green lines below). 3. Same as #2 but the RF radiation refracted or scattered over the horizon (like VHF tropo-scatter on Earth). Can Leif, or some other experts, clarify this for us? Thanks, John/af4ex probably #2, the sun is a messy place. but see: www.spaceweather.com/
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Post by af4ex on Nov 3, 2010 21:09:24 GMT
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Post by vk2fdxr on Nov 3, 2010 22:51:51 GMT
Is it just me or has 1120 disappeared and now there is a sunspot in the south?
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Post by af4ex on Nov 4, 2010 1:23:27 GMT
vk2fdxr: > Is it just me or has 1120 disappeared and now > there is a sunspot in the south? If you're referring to the SOHO Continuum in the top left corner, I do believe the image is inverted!
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Post by jcarels on Nov 4, 2010 9:00:22 GMT
Yep, that image is inverted. The leading spot of returning region 1112 is also visible on the eastern limb.
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Post by af4ex on Nov 4, 2010 17:14:37 GMT
FYI, The BASS2000 site has released the 3-Nov data for the VHF and UHF radioheliograph at Nançay, France. bass2000.obspm.fr/home.php(I'm guessing that they do this weekly, on Wednesday) The UHF (327Mhz) movie (see frame below) captured the second, C4 Flare on 3-Nov, (while Nobeyama slept) from the old 1112 sunspot. The 'hotspot' in the image looks to be about 200,000km from the solar surface, representing synchrotron radiation from particles accelerated to relativistic speeds by the flare. The VHF movie (150.9Mhz) also shows the event, with less resolution but even further out, maybe 300,000 or so km, revealing a different, lower-energy piece of the synchrotron radiation. The movie is also interesting because you can see some "vibration" artifacts (and some spurious reflections) caused by the rail system used to move the receiving antenna to track the sun during its 8-hour watch Attachments:
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Post by af4ex on Nov 4, 2010 20:17:11 GMT
... and here is a frame from the Nançay VHF heliograph at the time of the C4 flare on 3-Nov. It's further away from the Sun than the UHF artifact, which I'm assuming to be some kind of synchrotron "radiation" (at 150.9 Mhz). The curious thing about this BASS2000 VHF movie is that prior to the flare a similar artifact was hovering above the Northern hemisphere of the Sun and switched to this Southern location when the flare kicked off (and the solar disk portion of the image disappeared at that moment). In the UHF movie the artifact showed up only during the flare. So I'm not 100% confident this VHF artifact was really part of a solar flare, but the time of its appearance coincided with the flare. Open for discussion I guess. Attachments:
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Post by Bob k6tr on Nov 4, 2010 21:15:22 GMT
af4ex wrote: "Looks a computer glitch....."
See the update in the Satellite Thread
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Post by vk2fdxr on Nov 5, 2010 0:22:53 GMT
M-Class event just occured!!!! 1121 is gonna be a little ripper I think.
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Post by af4ex on Nov 5, 2010 0:49:51 GMT
Nobeyama heliograph caught it. Frame #8. Very bright in microwave spectrum. [Edit: And another M-Class [actually, C9.6] an hour later, frame #14] Attachments:
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Post by vk2fdxr on Nov 5, 2010 2:11:17 GMT
Is it just me or does 1121 not seem to have many sunspots? Sorry if I sound like a noob its because I'am haha
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Post by af4ex on Nov 5, 2010 2:29:44 GMT
> Is it just me or does 1121 not seem to have many sunspots? You're right, the active area is filled with 'plage' (Fr. for 'beach') but I only see one tiny spot. I'm a neophyte too, so am puzzled why this area is popping flares right and left, while AR 1120, further North, has two tiny spots, but is really weak. Perhaps this is an example of the Livingston&Penn ("L&P") effect, which asserts that the average sunspot constrast has been fading for over a decade. By 2020 or so most of them won't be darker than their surroundings, so will become invisible (but still sources for solar activity). Attachments:
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Post by vk2fdxr on Nov 5, 2010 2:33:55 GMT
As a ham, I hope this is not the case as I enjoy working 15m and 10m and for that we need some good sunspots. I guess its like anything to do with mother nature. Things change from minute to minute. Some accurate, some inacurate.
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Post by af4ex on Nov 5, 2010 3:01:54 GMT
> As a ham, I hope this is not the case as I enjoy > working 15m and 10m ...
Even though the sunspots may fade, they will remain magnetically active. According to Leif Svalgaard, there are historical precedents that the 11-year solar cycle will continue during these grand minima, so it may not be as bad as you fear. The SFI should hit 100 early next year.
I suppose that most people think Hams are nuts because we cheer up when the Sun gets nasty. [Edit: Like surfers who go the beach during a hurricane.] :-]
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