[SKRIVA] Rymdsensation: Tunn ring av antimateria runt jorden
- From: Ahrvid Engholm <ahrvid@xxxxxxxxxxx>
- To: <skriva@xxxxxxxxxxxxx>, <sverifandom@xxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 7 Aug 2011 18:16:30 +0200
Antimateria i form av antiprotoner har påträffats i en tunn ring runt jorden,
infångade av Van Allen-bältena. Det spekuleras över att det kan användas som
bränsle för framtida rymdfarkoster...
http://www.bbc.co.uk/news/science-environment-14405122
"A thin band of antimatter particles called antiprotons enveloping the Earth
has been spotted for the first time.
The find, described in Astrophysical Journal Letters, confirms theoretical work
that predicted the Earth's magnetic field could trap antimatter.
The team says a small number of antiprotons lie between the Van Allen belts of
trapped "normal" matter.
The researchers say there may be enough to implement a scheme using antimatter
to fuel future spacecraft.
The antiprotons were spotted by the Pamela satellite (an acronym for Payload
for Antimatter Matter Exploration and Light-nuclei Astrophysics) - launched in
2006 to study the nature of high-energy particles from the Sun and from beyond
our Solar System - so-called cosmic rays.
These cosmic ray particles can slam into molecules that make up the Earth's
atmosphere, creating showers of particles.
Many of the cosmic ray particles or these "daughter" particles they create are
caught in the Van Allen belts, doughnut-shaped regions where the Earth's
magnetic field traps them.
...
The new analysis, described in an online preprint, shows that when Pamela
passes through a region called the South Atlantic Anomaly, it sees thousands of
times more antiprotons than are expected to come from normal particle decays,
or from elsewhere in the cosmos.
...
Dr Bruno said that, aside from confirming theoretical work that had long
predicted the existence of these antimatter bands, the particles could also
prove to be a novel fuel source for future spacecraft - an idea explored in a
report for Nasa's Institute for Advanced Concepts."
--Ahrvid
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