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Originally posted by AgentSmith
reply to post by FoosM
This occurred around the 300th day of the mission, the accumulative effects from numerous SPEs will eventually take their toll. However it does not change the fact that the SPE's were not powerful enough to cause any noticeable damage to a human being, based on the data returned by the instrument while it was still functional for the nearly 300 days prior.
Proton Event list (which begins only with GOES)
Solar proton events (SPEs) are most effectively measured in space using satellites, but they can also be measured or inferred from atmospheric and ground level measurements on the Earth. Satellite data that provide information about SPEs go back to the late 1950s, but due to different measurement instrumentation, a continuous, directly comparable record is not available. The best systematic information comes from the GEOS satellite which has a geosynchronous orbit around Earth, and has been measuring solar radiation since 1976 to the present. The NOAA Space Environment Service Center provides a listing of major SPEs and the associated flux of protons with energies >10 Mev
28-30 Oct–ISS astronauts retreated to heavy
shielded service module; FAA issued its first
radiation dose warning for radiation to
passengers above 25,000 feet; Power
systems failed in Malmo, Sweden and the
Republic of South Africa; NOAA-17 AMSU-A1
lost scanner; ACE and WIND lost plasma
observations; GOES e-sensors saturated;
CHANDRA halted till 11/01
Sunspot cycle decline and minimum
years are ideal for “killer electrons” at
GEO and lower orbit altitudes.
Sunspot cycle maximum years are ideal
for energetic proton and heavier ion
events that cause SEUs and sensor
optics & power panel degradation. But
major solar events can happen anytime.
Major magnetic storms may happen at
any time and cause spectacular effects
on satellites, technology and humans
but they are most frequent in weeks
around equinox.
We now share information more openly than before, but much is still concealed because of commercial or other fears;
Helpful individuals within aerospace organizations develop close ties with institutional personnel, but then retire and there isn’t anyone to replace them (happens on both ends).
As lessons are learned about the effects of Space Weather by one generation, another comes along that hasn’t had the experience and must learn again at the expense of programs.
As successful scientists and engineers move into management positions, sometimes their attitudes change and they seem to forget important lessons.
Sometimes compartmentalization within an aerospace company can result in the same type of satellite being made by two different groups for different customers and one group will take account of past susceptibility issues while the other seems unaware of basic precautions.
1. NASA "defenders" have claimed that NASA knew enough about space radiation in 1968.
They probably realized that even waiting for the Solar Minimum was too risky.
Originally posted by AgentSmith
In the quote of my original post you used 'acceptable' is spelled correctly. When I went in to add the MARIE data I noticed it had been spelled 'aceptable' by accident and corrected it.
Besides that, in the quote you used I clearly state "I also posted data from a separate space probe some time ago showing radiation levels measured outside of the protective reach of the magnetosphere and as expected they too also showed radiation levels to be acceptable for short term exposure during even major SPEs." which you completely ignore and try and create the impression I am purely talking about RADOM.
Originally posted by nataylor
reply to post by PsychNurse
Do you think the engineering and stresses on a 8 pound instrument that's been in space for 2 and a half years is a little different than a 100,000 pound manned craft in space for a week and a half?
Originally posted by nataylor
reply to post by FoosM
No, I'm suggesting that an instrument that has been in space for several years has gone through many more stresses, such as thermal cycles, than a craft that is in space for a week and a half. And that the shielding on a small instrument designed to detect radiation is much different than the shielding on a manned craft.
Understood, but are you saying that spacecraft, probes or otherwise, cannot be damaged by a flare within a few days or a week of operation in space?
However, since you're obviously loading up a cut and paste fiesta about satellites being damaged by solar flares early in their career, proceed with your straw man as though someone had said" yes." Maybe then we can get back to discussing the glaring logical fallacies in Jarrah White's videos.
Originally posted by FoosM
Understood, but are you saying that spacecraft, probes or otherwise, cannot be damaged by a flare within a few days or a week of operation in space?
The M288 orbit ( 4 hour sidereal, 5 orbits per day relative to the earth) is located at a radius of 12789 km, about 6400 kilometers altitude. That places it between the inner and outer van Allen belts. This is a relatively high radiation environment compared to low earth orbit, but lower than the center of the belts. Recent advances in semiconductor technology permit unshielded electronics to operate in this region, and Server Sky takes advantage of that work. Traditional satellites are damaged by this much radiation; consequently, there are few satellites operating in these orbits.
Ionizing radiation does five nasty things to semiconductors:
Latchup
SEU - single event upsets, bit flipping
Oxide charging
Flash memory errors
Crystal lattice degradation
Masahiro Kawasaki, a member of the Space Activities Commission, said it is too early to tell if the satellite can be fully recovered. Its not in our hands to know whether DRTS will become fully functional again, he said.
If the satellite cannot be recovered, it would be Japans second major space mishap in less than a week. On Oct. 25, JAXA lost contact with the Advanced Earth Observing Satellite-2, and hopes for recovering that craft are fading rapidly.
The DRTS incident also has raised questions about Japans ability to protect its satellites from solar flares. JAXA has no countermeasures to assist during a solar flare, complained one official. Its a weakness.
Junichiro Moriuma, a JAXA spokesman, confirmed that the agency had no procedures to protect the satellite, despite warnings that a strong geomagnetic storm was on the way. DRTS is a big satellite and it is difficult for us to take precautions, he said.
From: www.vanderbilt.edu...
The problem only promises to get worse as computers become smaller and smaller. Many companies are currently building processors at the 45-nanometer level, while others like IBM and NEC are working toward 22-nanometer chips. (A one-nanometer circuit is equal in size to one billionth of a meter.)
“Smaller electronic devices are cheaper, faster and more functional,” Massengill says. “However, as these devices decrease in size, they also become more susceptible to radiation. For example, today’s desktop computers are quite sensitive to ambient radiation, which is emitted by almost everything around us.”
Originally posted by theability
reply to post by DJW001
However, since you're obviously loading up a cut and paste fiesta about satellites being damaged by solar flares early in their career, proceed with your straw man as though someone had said" yes." Maybe then we can get back to discussing the glaring logical fallacies in Jarrah White's videos.
Well Said!
Yes let us discuss the logical fallacy of JW videos, its about time.
Originally posted by FoosM
Originally posted by theability
reply to post by DJW001
However, since you're obviously loading up a cut and paste fiesta about satellites being damaged by solar flares early in their career, proceed with your straw man as though someone had said" yes." Maybe then we can get back to discussing the glaring logical fallacies in Jarrah White's videos.
Well Said!
Yes let us discuss the logical fallacy of JW videos, its about time.
We are all waiting for these discussions to happen.
Lets see how long this takes.
Originally posted by CHRLZ
STOP PRESS!!
Especially for tomblvd, but for all discerning viewers eager to find out more about Jarrah's 'expert witness' program.... it appears that the 'expert' in Jarrah's video was contacted, way back in 2007 - try here:
educationforum.ipbhost.com...
Scroll down to the post by Dave Greer, Apr 19 2007, 12:15 PM.
The image he created is no longer there, but you'll see it shortly if you keep reading..
Because.. it gets SO MUCH BETTER. Scroll down to about 3/4 of the way down, Dave Greer again at Apr 23 2007, 04:58 AM.
There is the email from Jenny Heller for all to see, with her permission. And the (very pleasant) email from Dave that elicited her reply, along with an example image showing the same type of shadow effect. Like i said, It's not hard to do.
Now, I'm not going to quote the email from Jenny, except to whet your appetite with these words "...one of his class assignments.."
I STRONGLY recommend that everyone goes and takes a long hard look at what she says. Try to keep a straight face while doing so.
If Jarrah could have been busted worse, I honestly don't know how.
I'll be interested to hear other comments on this. I'm afraid I'm finding it rather difficult to stop laughing. BTW, in case you are concerned at what you might find, the email is not embarrassing at all, from Jenny's perspective... In fact, I congratulate her for what she did, and said.
But from Jarrah's? OH DEAR!!!!
Priceless. You just can't get better entertainment than this....
Originally posted by FoosM
Why is LEO so busy?
Originally posted by FoosM
I dont understand (if I would believe we landed men on the moon) how difficult is it to protect these satellites with Apollo grade aluminum shielding?
Originally posted by theability
No matter what I'll take the PhD's explanation of events over your assessment any day.
Look at it this way. Suppose you are inside an enclosure. A bullet
strikes the outside and sets off a cascade of ping-pong balls on the
inside. Which would you rather have hit you, the bullet, or the ping-
pong balls?
email from Dr. Eleanor Blakely
To use the comparison made in your message, this means that indeed depending on the particle energy and atomic number, ping pong balls could be more damaging than the bullet! The fragmentation event that produced the "ping pong balls" also can produce secondary radiations such as neutrons which we have not talked about in this conversation.