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This is a graph showing the abundance of various GCR nuclei (versus protons)
Galactic cosmic rays (GCRs) come from outside the solar system but generally from within our Milky Way galaxy. GCRs are atomic nuclei from which all of the surrounding electrons have been stripped away during their high-speed passage through the galaxy.
than they are in cosmic abundance. The ISS, as I previously mentioned, goes through the southern atlantic anomaly and encounters some of these particles.
The astronauts stay up there for months at a time, passing through the region again and again, soaking up these GCRs and yet they're still alive.
Apollo missions lasted for a matter of days, we're talking about twenty times the amount of time spent in space, and multiple passes through the SAA over the course of several consecutive orbits. How much flux are we talking about in the SAA?
"The South Atlantic Anomaly boundary is for 100 MeV protons with flux greater than 100 particles/cm2-sec" -
There's your big flux, it's bigger in the magnetosphere than it is beyond it, as I showed in the previous graph. ISS hits the SAA on about 50% of its orbits and spends 5-10 mintues within it in each of those orbits.
Say you spend half a year on the space station, not uncommon. About 183 days. 7.5 minutes of half your orbits are spent in the SAA. It's about a 90 minute orbit. That's 12% of half your orbits then. Therefore, you spent 11 days inside the SAA. So apparently, spending one hour every day at those levels for half a year is not dangerous if you're in an aluminum can.
Yes the remaining particle flux, in other words only what passed
"The South Atlantic Anomaly boundary is for 100 MeV protons with flux greater than 100 particles/cm2-sec" -
If you sustain such claims then you are in trouble with your arguments, because that means there is a biger flux outside the magnetosphere.
Why don't I take this value of yours and aply it on the moon ehhh?
Say you spend half a year on the space station, not uncommon. About 183 days. 7.5 minutes of half your orbits are spent in the SAA. It's about a 90 minute orbit. That's 12% of half your orbits then. Therefore, you spent 11 days inside the SAA. So apparently, spending one hour every day at those levels for half a year is not dangerous if you're in an aluminum can.
Yesin your in an aluminium can where particles can't penetrate, happy?
Difrent story on the moon where the aluminium can would of been ussles simply because the particles would react right near the craft, and any way this is irelevant, thge astronauts were most of the time outside.
Further more I did not say the particles hitting directly is a major factor, but the generation of EM because aluminium offers no protection from gamma.
If you look across my posts my major argument is gamma radiation, I did not insist on particles hitting the craft penetrating and causing problems.
What I did say is that particles that hit the moon would of caused problems for astronauts because they were right there where the proccess took place, unlikein our orbit where such events do not ocur.
Originally posted by ngchunter
Yes the remaining particle flux, in other words only what passed
Wrong. The southern atlantic anomaly is part of the van allen belt, it's not what's passed, it's what's trapped BY the magnetosphere. It's more intense than the areas beyond the magnetosphere for that very reason.
Originally posted by xion329alpha
reply to post by weedwhacker
You show me how they faked 1969 footage with people nearly 40 years older. And yes you can call it a documentary because it is not a movie.
Show me where it was debunked, and do not give me an ATS tread link because I am not reading a thread full of posts by people like you.
Dude, do you have any clue as to what a minimum boundary is??? 100MeV protons with a flux GREATER THAN 100 particles/cm2-sec is the MINIMUM present in the SAA, not the MAXIMUM. That's just what defines the beginning of the SAA, the maximum can vary over time. In any case, I haven't seen you provide the first lick of evidence for the flux present outside the magnetosphere. All you've done is sit there pretending to attack my arguments without a shred of supporting evidence. I'm growing quite tired of destroying your arguments with proof only to have you come back to the same argument without any proof.
Get clear on this right now, there CAN NOT BE any singificant gamma ray generation without elements with a high atomic number to hit! That is why aluminum is a good shielding material, it doesn't allow there to be any significant gamma rays in the first place!
Actually, looking across your randomly jumping posts talking about various particles and gamma rays, you rarely ever specified the source of the gamma rays. If your only argument is that the surface has too much gamma production, then you just admitted that every apollo mission through 10 was possible and real. But your argument is false. I already provided data on the gamma ray counts for the surface of entire regions for the moon, and it's less than 1 photon per 32 seconds at higher
energies. Lower energies border on being no more dangerous than x-rays, and you've already made it clear you don't consider that to be a danger.
What you fail to acknowledge is the fact that high energy gamma ray production on the moon's surface occurs well below the surface before the particles manage to interact with a heavy element, allowing the gamma rays to be scattered by surface material before they finally emerge.
When cosmic rays collide with atoms in the crust, they violently dislodge neutrons and other subatomic particles, such as gamma rays. Some of the neutrons escape directly to space, as hot or "fast" neutrons. Other neutrons shoot off into the crust, where they collide with other atoms, bouncing around like pinballs. If they only run into heavy atoms, they do not lose very much energy in the collisions, and are still traveling at close to their original speed when they finally bounce off into outer space. They are still "warm" when they reach Lunar Prospector.
I think, you can educate me, protons and neutrons are about the same mass....to us, so small as to be insignificant. Point is: most of these 'lighter' nuclei can pass without much damage left behind. It is the heavier elements, and THEIR nuclei, (Uranium, etc) that cause damage. AND, of course, as you have pointed out, the more energetic frequencies, X-Rays and Gammas, for example.
But these EM frequencies don't occur in Nature as much as you seem to wish they would....don't you think the X-Ray machine at a Hospital is designed to focus, and concentrate, the X-Rays for a specific purpose?
Originally posted by pepsi78
Originally posted by ngchunter
Yes the remaining particle flux, in other words only what passed
Wrong. The southern atlantic anomaly is part of the van allen belt, it's not what's passed, it's what's trapped BY the magnetosphere. It's more intense than the areas beyond the magnetosphere for that very reason.
The ISS does not go in to that, the gemeny went for a ride , or atempted if I remember corectly.
What has the van alen belts have to do with our disscusion any way? I do not see the point, those are traped particles.
Originally posted by pepsi78
Actually, looking across your randomly jumping posts talking about various particles and gamma rays, you rarely ever specified the source of the gamma rays. If your only argument is that the surface has too much gamma production, then you just admitted that every apollo mission through 10 was possible and real. But your argument is false. I already provided data on the gamma ray counts for the surface of entire regions for the moon, and it's less than 1 photon per 32 seconds at higher
From who from nasa? does that picture look to you like the mejurments you provided? you know the one where the moon looks like a nuclear reactor, you know I can't even look at it it;s so bright and red it will hurt my eyes.
Get real.
You get an aurora show here on earth from particles colideing over north pole, imagine the moon.
energies. Lower energies border on being no more dangerous than x-rays, and you've already made it clear you don't consider that to be a danger.
I do not consider it because electrons make up 1 procent of GCRS.
What you fail to acknowledge is the fact that high energy gamma ray production on the moon's surface occurs well below the surface before the particles manage to interact with a heavy element, allowing the gamma rays to be scattered by surface material before they finally emerge.
hit what, like what air? how about a non existant atmosfere?
mean while here is the official explenation.
Here.
spacecraftkits.com...
When cosmic rays collide with atoms in the crust, they violently dislodge neutrons and other subatomic particles, such as gamma rays. Some of the neutrons escape directly to space, as hot or "fast" neutrons. Other neutrons shoot off into the crust, where they collide with other atoms, bouncing around like pinballs. If they only run into heavy atoms, they do not lose very much energy in the collisions, and are still traveling at close to their original speed when they finally bounce off into outer space. They are still "warm" when they reach Lunar Prospector.
There is radiation bouncing all over the place, hitting the astronauts, pour astronauts or should I say astro-NOTS
[edit on 21-2-2008 by pepsi78]
Originally posted by pepsi78
Get clear on this right now, there CAN NOT BE any singificant gamma ray generation without elements with a high atomic number to hit! That is why aluminum is a good shielding material, it doesn't allow there to be any significant gamma rays in the first place!
And I think I told you a million times this is irelevant if the lem was siting on the moon.
Want me to tell you again a milion times why?