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Message 2063967 - Posted: 19 Dec 2020, 23:12:01 UTC - in response to Message 2063936.  

Further information has come to light on the Proxima Centauri SETI signal candidate...

... stellar flaring of Proxima Centauri...

A very narrow-band, unmodulated signal ( only 1 frequency bin wide) was discerned at 982.002 MegaHertz on several days...

https://www.scientificamerican.com/article/alien-hunters-discover-mysterious-signal-from-proxima-centauri/

Sounds like a natural maser.

Very interesting non-the-less! There is more to learn and study from that one... That could prove to be a very good test for candidate signal tests :-)


Keep searchin',
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Message 2064000 - Posted: 20 Dec 2020, 13:33:25 UTC - in response to Message 2063967.  
Last modified: 20 Dec 2020, 13:40:16 UTC

Further information has come to light on the Proxima Centauri SETI signal candidate...

... stellar flaring of Proxima Centauri...

A very narrow-band, unmodulated signal ( only 1 frequency bin wide) was discerned at 982.002 MegaHertz on several days...

https://www.scientificamerican.com/article/alien-hunters-discover-mysterious-signal-from-proxima-centauri/

Sounds like a natural maser.

Further detail is discussed by Anton Petrov:

SETI Detected a Strange Radio Signal From Proxima Centauri


One further significant detail is that the signal is blue shifted matching that expected for the planet Proxima Centauri B. The sidebands shown for the signal suggest a steady continuous modulation.

Might that turn out to be an effect from aurora on that planet or some other interaction with a magnetic field for the planet?

Might the signal be the result of the planet disturbing or otherwise interacting with the effects of the flares from the parent star?

(All just astronomically wild guesses :-) )

See the wikipedia entry on this event: BLC-1


Very interesting non-the-less! There is more to learn and study from that one... That could prove to be a very good test for candidate signal tests :-)



Keep searchin',
Martin
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Message 2064010 - Posted: 20 Dec 2020, 17:04:11 UTC - in response to Message 2063967.  

Further information has come to light on the Proxima Centauri SETI signal candidate...

... stellar flaring of Proxima Centauri...

A very narrow-band, unmodulated signal ( only 1 frequency bin wide) was discerned at 982.002 MegaHertz on several days...

https://www.scientificamerican.com/article/alien-hunters-discover-mysterious-signal-from-proxima-centauri/

Sounds like a natural maser.

Very interesting non-the-less! There is more to learn and study from that one... That could prove to be a very good test for candidate signal tests :-)


Keep searchin',
Martin


Thanks for your reply, Martin. It could be an astrophysical MASER . I looked for information on any spectral lines a MASER might produce at or near 982 MHz, but found none. Perhaps a previously unobserved spectral line, from a substance not heretofore known to be a MASER medium. That seems a longshot, though. Have you any thoughts on what the MASER medium could be, in this case?

The only connection I see with any spectral line is the following curious fact: The frequency of the Proxima Centauri signal ( 982.002 MHZ ) is *very* nearly three times the deuterium spectral line at 327.384 MHz. This could be a coincidence. of course, but the fit is remarkably close. This looks to me more like the logic of a SETI 'magic frequency' than a natural phenomenon.
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Message 2064060 - Posted: 21 Dec 2020, 12:44:02 UTC - in response to Message 2064010.  

It shouldn't be that difficult to see if there is any modulation that might indicate other than natural phenomena.
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Message 2064087 - Posted: 21 Dec 2020, 16:41:57 UTC
Last modified: 21 Dec 2020, 16:45:01 UTC

Should perhaps read, but how do you detect possible modulation in a signal?

https://en.wikipedia.org/wiki/Modulation

Or maybe the gaussian was just only the carrier here for such a thing.
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Message 2064095 - Posted: 21 Dec 2020, 18:30:53 UTC - in response to Message 2064060.  
Last modified: 21 Dec 2020, 18:34:45 UTC

It shouldn't be that difficult to see if there is any modulation that might indicate other than natural phenomena.


There has been some discussion of this point in astronomical circles. The Parkes radio telescope was being used for the observation of stellar flares at Proxima Centauri. The candidate SETI signal was examined only much later, in the archives.
We do not have the observational details yet, but it seems reasonable that they might well have been using a long integration time, which would tend to smear out any details like modulation.

If so, the radio energy from relatively long periods of time would have been averaged to one value. This enables the readings from relatively long-lasting phenomena like stellar flares to build up to greater strength, and facilitate the observations.

We'll know more about this when Dr. Simeon and his team complete their analysis of the candidate signal, and publish papers about it. The only reason we heard about this signal candidate at this early point, is that someone leaked a bit of information about it to the Press.
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Message 2064115 - Posted: 21 Dec 2020, 23:56:23 UTC - in response to Message 2064010.  
Last modified: 22 Dec 2020, 0:00:31 UTC

... It could be an astrophysical MASER . I looked for information on any spectral lines a MASER might produce at or near 982 MHz, but found none. Perhaps a previously unobserved spectral line, from a substance not heretofore known to be a MASER medium. That seems a longshot, though. Have you any thoughts on what the MASER medium could be, in this case?

The only connection I see with any spectral line is the following curious fact: The frequency of the Proxima Centauri signal ( 982.002 MHZ ) is *very* nearly three times the deuterium spectral line at 327.384 MHz. This could be a coincidence. of course, but the fit is remarkably close. This looks to me more like the logic of a SETI 'magic frequency' than a natural phenomenon.

A harmonic of the deuterium spectral line is an interesting idea.

An alternate and very wild idea is that we have stumbled across a (strangely powerful?) radio recombination line emission for the planet or some surrounding gas or orbital gas cloud. Or for interaction with the planet and flare itself? Note that RRLs are emissive above a few 100 MHz:

(pdf) The first detection of radio recombination lines at cosmological distances

And there's a lot of material to play with! (List of interstellar and circumstellar molecules)


With only the minimal 'teaser' data, we can only play wild guesses until they release the details of their studies.

A Pan-Galactic Gargle Blaster for the best guess?! ;-)


Keep searchin',
Martin
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Message 2064167 - Posted: 22 Dec 2020, 21:37:51 UTC
Last modified: 22 Dec 2020, 21:44:10 UTC

The He n-Alpha line (Hel 188A) at 982.2399 MHz looks the most likely. Given the great multitude of radio recombination lines that have been inferred, it seems that the radio spectrum would almost be saturated with these, if most of them were actually emitting .

I'm struck by the way the signal apparently rose in frequency consistently, for several days, as it was repeatedly observed. The signal has been ascribed by some to an unidentified example of our own technology. I doubt this, though. If the frequency rise is attributable to a Doppler shift, it doesn't resemble one from one of our own aircraft or satellites, not with so long and consistent a motion of approach.

It does look like a Doppler shift caused by a rather slow-rotating planet, or by the motion of a planet around its star.
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Message 2077834 - Posted: 13 Jun 2021, 12:25:30 UTC

Signal detected: Are we alone in the endless abyss of space?
If aliens are sending us signals, are we set up to detect them?
W5's Dan Riskin speaks with Dan Wertheimer, Seth Shostak and other planetary scientists, radio astronomers, and computer scientists who explain how the search for ET has ramped up in the last few decades.
But if they're successful, is there a way to predict what alien creatures might look like?
There's also a few references to SETI@home.
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Message 2086924 - Posted: 27 Oct 2021, 6:24:15 UTC - in response to Message 992702.  

https://scitechdaily.com/a-mysterious-signal-looked-like-a-sign-of-alien-technology-heres-what-the-investigation-revealed/

A Mysterious Signal Looked Like a Sign of Alien Technology – Here’s What the Investigation Revealed


In December last year, the media reported an intriguing signal we at the Breakthrough Listen project found in our radio telescope data. Dubbed BLC1, the signal didn’t appear to be the result of any recognizable astrophysical activity or any familiar Earth-based interference.

The trouble was, we weren’t ready to discuss it. When you’re searching for signs of extraterrestrial life, you want to be very careful about getting it right before you make any announcements. Last year we had only just started secondary verification tests, and there were too many unanswered questions.
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Message 2088830 - Posted: 24 Nov 2021, 6:09:04 UTC - in response to Message 2086924.  

follow up to a signal?

https://www.scientificamerican.com/article/mysterious-fast-radio-bursts-are-finally-coming-into-focus/
Mysterious Fast Radio Bursts Are Finally Coming into Focus

Nobody noticed when an Australian radio telescope captured a fleeting explosion of light coming from somewhere far beyond the Milky Way in 2001. Records of the powerful flare-up—which produced as much energy in a few thousandths of a second as the sun does in a day—sat unseen for more than half a decade until a group of scientists sifting through archival data spotted the stupendous eruption—a so-called fast radio burst (FRB).
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Message 2088870 - Posted: 24 Nov 2021, 15:07:18 UTC - in response to Message 2088830.  

Thank you, Lynn, for sharing that very good article on FRBs from Scientific American. It seems possible that an artificial signal could resemble one from a astrophysical source, like a highly magnetized pulsar, or magnetar, given a sufficiently advanced civilization.

These are still very early days for us, where Fast Radio Bursts are concerned. FRBs are said to have a great deal of complex structure within the signal band. I hope that this structure can eventually be analyzed, in case it might contain some intelligent modulation.

Such analysis would be particularly valuable where an astrophysical source seems less likely, such as in area of space where young, violent stars, which are believed to give rise to natural FRBs, are not thought to exist.
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