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University Daily Kansan, November 19, 1980
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KU prof sifting Voyager data
By DALE WETZEL Staff Reporter
Armstrong, professor of physics and astronomy, returned this week from the Applied Physics Laboratory in Maryland. It was there that Armstrong observed Voyager's closest approach to Saturn.
In the aftermath of Voyager I's visit to Saturn last week, KU professor Thomas Armstrong possesses reams of data, but is unsure yet how to interpret it.
begins the planet's magnetic forces become strong enough to dominate charged particles ejected by the sun. The sun constantly sends out these streams of protons and electrons, a phenomenon referred to by astronomers as the "solar wind," Armstrong said.
Voyager is now heading into deep water. But Arm-strength's task has just begun.
His data concerns the behavior of charged particles in Saturn's magnetosphere. Little is known about what makes the particles behavior. What said he hoped his information would shed some light on his subject.
SATURN'S MAGNETOSPHERE
“It’s a lot like Earth’s, but a little more intense and a little bigger. It is also made up mostly of protons and neutrons, like Earth’s.” Armstrong said.
Preliminary analysis of Voyager's data indicates that Saturn's magnetosphere is similar to Earth's, Armstrong said.
"In contrast, Jupiter's magnetosphere is much more intense, much more volatile, and much bigger. It is also has more exotic constituent oxygene—there's some sulfur ions, oxygen, and other elements."
However, Armstrong said, it is too
early to begin speculation on the data's implications. A week or two of analysis should bring a more thorough interpretation of the data's meaning, he said.
IN LIGHT OF the limited knowledge about charged particles' behavior, special caution is needed in interpreting their possible effects on planets, according to Pat Briggs, Sacramento, Calif., graduate student.
The measuring instrument aboard Voyager, which Armstrong also helped to design, is something of a feat in itself. Briggs said.
"Once we begin to understand the physical processes that make these charged particles behave the way they do, we may begin to see correlations with other atmospheric factors that we didn't see before," Briggs said.
Saturn is especially valuable as a data source, Briggs said, because knowledge of its rings could lead to more sophisticated understanding of charged particles' behavior than would be possible otherwise.
The device incorporates a number of thin silicon slabs that measure the energy of particles that pass through them.
“It’s constructed a bit like a solid-state telescope. The whole instrument vaguely resembles R2D2.” Briggs followed to the famed Star Wars robot.
As the particle passes through each slab, it leaves a bit of energy," Armstrong said. "The particle's voltage can then be determined, and from that we can tell to a pretty good extent its mass, charge and the energy it contains."
Arnoldrush said an identical instrument was aboard Voyager II, which is scheduled to visit Saturn next month. Uranus in 1986 and Neptune in 1989
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