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RE: Effects of magnetosphere loss
On Saturday, August 22, 1998 1:53 PM, Jim Choate [SMTP:firstname.lastname@example.org]
> The Van Allen Belt is not part of the atmospher strictly speaking. It is
> interface between the solar magnetosphere and the Earths. Even if the
> didn't have an atmosphere it would have a magnetosphere (ie Van Allen
> The disruption to the belt would not come from the loss of ejected gases
> rather the shift in the Earths center of gravity caused by the impact
> assure you a 100mi. dia. crater will make the Earth wobble and ring for
> quite a while) and the em interactions of the impact (Q: has anyone
> calculated the EMP from such an impact?).
The impact should have been energetic enough to create an ejected plasma of
its own -- a sort of solar flare in reverse. Should have done wonders for
> Actualy the Van Allen Belt can be measured in the geologic record by
> measuring the magnetic stripes in the sea floor upwellings. These are
> correllated since they come from the same thing - the Earths magnetic
> Pick stripes of a given polarity and correlate the changes in
> along that stripe in relation to other markers. One marker might be to
> compare it to both measurements and models of the long-term solar
I'm not sure I follow. The stripes give us polarity and general direction.
Can you get quantitative information (field strength) as well? Does this
tell us anything about the state of the magnetosphere?
> Seems to me that if there was an increased level of solar radiation (and
> don't mean the UV that the ozone layer blocks) the consequences would be
> plastered all over both the geophysical and biological records. One
> simply have to look at the effects of increased radiation on long-lived
> chemical and bio-chemical systems today and extrapolate backward looking
> those same tale-tales. It might be as simple as looking at the ratios of
> isotopes in trapped air samples in the Antarctic and comparing them to
> mid-ocean upwellings mag stripes.
This may turn out to be a very complex process, all of which may add up to
little net result. For example, any loss of magnetospheric blocking of
charged particles may be offset by physical blocking by dust in the lower
atmosphere during KT+0 to KT+3 (to put a speculative number on it).
Magnetic storm disruption of the magnetosphere is over in a few days.
What reason do we have to think this would be a longer term process?
Changing the *shape* of the Van Allen belts should have little effect on
their ability to redirect charged particles, so that the vibrations due to
the impact would not be reflected in any long-term inrease in high energy
particles reaching the surface. Finally, I'm not to sure how seriously to
take my solar-flare-in-reverse idea above, but it does seem likely that the
impact would create ejected high energy ions which could be recruited by
> Most mutations are neutral and don't effect the viability of the species
> the individual. Next comes mutations that are harmful and finaly, and
> likely, are mutations that are beneficial. While this is interesting it
> probably pointless. Even if a given species were to exhibit a beneficial
> mutation the chances of the other ecologicaly linked species to have
> that allowed them to survive would nullify the beneficial events.
> powerful the positive forces might be they would not be sufficient to
> compensate for the ecological damage on a broad front.
If this were true, there could never be a beneficial mutation. Recall we
are, in any case, dealing with a highly disrupted ecosystem undergoing
rapid succession. If there were ever a time when a mutation could find a
new niche, this was it.