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SETI astronomers search for ET signal from Gliese 581
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SETI astronomers search for ET signal from Gliese 581
"signifiespost" wrote in message ... This did not reveal nothing! Then it must have revealed something. What was it? |
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SETI astronomers search for ET signal from Gliese 581
signifiespost:
This did not reveal nothing! OK, so what did it reveal? -- I agree with almost everything that you have said and almost everything that you will say in your entire life. usenet *at* davidillig dawt cawm |
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SETI astronomers search for ET signal from Gliese 581
"Davoud" wrote in message ... signifiespost: This did not reveal nothing! OK, so what did it reveal? It revealed the illiteracy of "signifiespost" |
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http://arxiv.org/abs/1205.6466 On 2007 June 19, Gliese 581 was observed for 8 hours at 1230-1544 with the Australian Long Baseline Array. The dataset was searched for signals appearing on all interferometer baselines above five times the noise limit. A total of 222 potential SETI signals were detected and by using automated data analysis techniques, were ruled out as originating from the Gliese 581 system. From our results we place an upper limit of 7 MW/Hz on the power output of any isotropic emitter located in the Gliese 581 system, within this frequency range. The Australian Baseline Array Telescope will not be able to detect signals below 7 MW/Hz! The learned researchers themselves are admitting the upper limit as 7 MW/Hz from Gliese 581 system! They were simultaneously mentioning about 222 potential signals as detected! Wikipedia source on radiowaves: Radio waves travel at the speed of light in a vacuum. If radio waves strike an electrically conductive object of any size, they are slowed according to that object's permeability and permativity! It is difficult to presume that a signal travelling for such long distance did not strike any such object and did not vary its frequency! The researchers took 5 long years to rule out signals reception in a limited range and for a very short period of time! But that doesn't rule out ET on Gliese 581! We at signifiespost constantly remind ourselves to report with objectivity! You are invited to read other blogs too to find that yourselves! quote |
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SETI astronomers search for ET signal from Gliese 581
"srinivasbhatt" wrote in message ... 'Androcles[_78_ Wrote: ;1214314']"Davoud" wrote in message ...- signifiespost: - This did not reveal nothing!- OK, so what did it reveal? - It revealed the illiteracy of "signifiespost" Check out the original report, pal! http://arxiv.org/abs/1205.6466 On 2007 June 19, Gliese 581 was observed for 8 hours at 1230-1544 with the Australian Long Baseline Array. The dataset was searched for signals appearing on all interferometer baselines above five times the noise limit. A total of 222 potential SETI signals were detected and by using automated data analysis techniques, were ruled out as originating from the Gliese 581 system. From our results we place an upper limit of 7 MW/Hz on the power output of any isotropic emitter located in the Gliese 581 system, within this frequency range. The Australian Baseline Array Telescope will not be able to detect signals below 7 MW/Hz! The learned researchers themselves are admitting the upper limit as 7 MW/Hz from Gliese 581 system! They were simultaneously mentioning about 222 potential signals as detected! Wikipedia source on radiowaves: Radio waves travel at the speed of light in a vacuum. If radio waves strike an electrically conductive object of any size, they are slowed according to that object's permeability and permativity! It is difficult to presume that a signal travelling for such long distance did not strike any such object and did not vary its frequency! The researchers took 5 long years to rule out signals reception in a limited range and for a very short period of time! But that doesn't rule out ET on Gliese 581! We at signifiespost constantly remind ourselves to report with objectivity! You are invited to read other blogs too to find that yourselves! quote -- srinivasbhatt None of which has any relevance to the illiterate double negative in "This did not reveal nothing", which does not reveal the not grammatically not incorrect illiterate, "pal". |
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SETI astronomers search for ET signal from Gliese 581
In article ,
srinivasbhatt wrote: 'Androcles[_78_ Wrote: Check out the original report, pal! The Australian Baseline Array Telescope will not be able to detect signals below 7 MW/Hz! The learned researchers themselves are admitting the upper limit as 7 MW/Hz from Gliese 581 system! They were simultaneously mentioning about 222 potential signals as detected! As a "gedankenexperiment", think what someone at Gliese581 would make of earth, using the same technology. Our strongest transmitters on AM (with a limited frequency span) are less than 2 MW, where most of the energy is within 3.5 KHz off this core frequency; or about 0.6 MW/Hz at best. Modern radio transmitters also avoid radiating into space if they can, limiting this figure by possibly an order of magnitude. Earth would therefore be about an order of magnitude too far away, and Gliese is only about 20 LY away. Even detecting us from Sirius is a pretty tall order. The Gliesians might just be able to detect the 50/60Hz signals from our electricity grid, if we get that sufficiently in phase; but this signal would probably be inconclusive for a seti search because of the absence of an embedded signal, and the similarity to natural processes. Wikipedia source on radiowaves: Radio waves travel at the speed of light in a vacuum. If radio waves strike an electrically conductive object of any size, they are slowed according to that object's permeability and permativity! It is difficult to presume that a signal travelling for such long distance did not strike any such object and did not vary its frequency! The researchers took 5 long years to rule out signals reception in a limited range and for a very short period of time! But that doesn't rule out ET on Gliese 581! Not at all. If you look at how far away we will be detectable, the limit is around 1000ly, where the actual number of photons in the signal of a low frequency 2MW radio station becomes a hard limit. This does of course work the other way too. We would need to cover the "dark" side of the moon with receivers to have a shot at getting a signal from a Radio Lux located near Beetlegeuse. (800 ly). Radio Lux, at 1.6MW uncontrolled radiation at 208 kHz and a 3.5 kHz signal was the transmitter stedily sending the largest amount of (low- energy) photons into space in human history. The VLF array and the Kiev radar exceeded it, but only in brief intervals. We at signifiespost constantly remind ourselves to report with objectivity! You are invited to read other blogs too to find that yourselves! Or we could do the math ourselves. The antenna sensitivities needed for even detection at 20 ly is not promising for seti. We wouldn't find earth transmissions even at 20 ly with the current observations. -- mrr |
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