Quote:
Originally Posted by xelasnave
From Wiki... taking this statement as being reasonable
http://en.wikipedia.org/wiki/Neutrino
Most neutrinos passing through the Earth emanate from the Sun. Every second, in the region of the Earth, about 65 billion (6.5×1010) solar neutrinos pass through every square centimeter perpendicular to the direction of the sun.[4]
Wow and that is from just one Sun  .
alex  |
Alex;
I think that figure, or its interpretation by Wiki authors, might be dodgy (Wiki's problem .. not yours)?
I checked the reference
linked paper (Dec 2004) and I can't find anywhere where it cites this figure.
(Someone can check me on this).
From the
Ice Cube observatory with 22 strings (25% of planned total detectors), as at July 2009), they say:
Quote:
The average upper limit over the northern sky for point sources of muon-neutrinos with E^−2 spectrum is:
E^2 Φ(νμ) < 1.4 × 10^−11 TeV cm−2 s−1,
in the energy range from 3 TeV to 3 PeV, improving the previous best average upper limit by the AMANDA-II detector by a factor of two.
|
So, it seems the presently accepted flux density (as measured) is:
14x10^-11
GeV per square cm per sec.
If the combined mass of all three neutrinos is say, 0.28 eV, then using the Ice Cube figures, (& by my quick calcs … if someone can check me) .. comes out to be about 0.05 combined neutrinos per square cm per sec.
Mind you, I'm not quite sure what the E^-2 spectrum means. (I think this is just scientific speak for straight flux density).
Its a big difference if I'm right (which might also be a first on this sort of stuff .. I'm happy to be corrected ...).
Cheers