Water Hole Frequencies within the Microwave Range


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Message boards : SETI@home Science : Water Hole Frequencies within the Microwave Range

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Profile Eric Rojas Chiong
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Message 1058016 - Posted: 20 Dec 2010, 6:21:39 UTC

Just wondering if the background noise (1420 to 1720 MHz) is what we are looking for and tracking using BOINCLogX which then gets plotted by SETI@Home Mapview? Or, are we looking for "anything" that shows up persistently and distinctively, within the range of 1420 to 1720 MHz? I thought I was looking at the "water molecules" noise instead of "background" noise.

"Hydrogen atoms emit at 1420 MHz (a wavelength of 21 cm). Hydroxyl molecules, composed of one atom of hydrogen and one atom of oxygen (OH), emit at four specific radio frequencies ranging from 1612 MHz to 1720 MHz. When a hydrogen atom combines with a hydroxyl molecule it forms a molecule of water, the most essential molecule for life as we know it. Thus, the range of frequencies from 1420 to 1720 MHz is called the Water Hole."

Profile Johnney Guinness
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Message 1058315 - Posted: 21 Dec 2010, 4:02:38 UTC - in response to Message 1058016.
Last modified: 21 Dec 2010, 4:06:14 UTC

I think BOINCLogX just plots points in the sky from the work units your computer is processing. I don't think BOINCLogX does a whole lot more. The SETI@home algorithms are searching for repeating patterns in or around the 1420MHz frequency. I could be wrong but i think it might be + or - about 10 or 20 hertz.

99.99999 % of the stuff you see in the SETI screen-saver is interference. We live in hope that we will find that 0.000001 % that is not interference.

Lots more SETI science here; http://setiathome.berkeley.edu/sah_about.php

John.
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Message 1077232 - Posted: 14 Feb 2011, 18:13:12 UTC

Helium has an emission line, why not use it?

Mind you unlike Hydrogen, you don't have H2 + H + H_inv emission lines in the RF band.

In any case, it is a thought.

Michael Watson
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Message 1077531 - Posted: 15 Feb 2011, 15:12:46 UTC

The emission line of ionized Helium isotope (3 He III) is 8,665.650 MHz. While Arecibo can listen from 50 MHz to 10,000MHz, I understand that the feed used by SETI@Home extends only from 1200 MHz to 3000 MHz. I read that the Allen Telescope Array listens continuously from 500 to 11,200MHz, so it can be said to cover the Helium emission.

Message boards : SETI@home Science : Water Hole Frequencies within the Microwave Range

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