JOHN HOFFMAN XRG PLUS
JOHN HOFFMAN XRG SERIES

JOHN HOFFMAN XRG SERIES

These were scooped up and analyzed in a series of small furnaces. An arm on the lander dug a trench a meter deep in the surface of Mars to look for water ice and other water related substances (minerals). The spacecraft landed in the far northern region of Mars, above the arctic circle in the area that the Mars Odyssey spacecraft has found evidence for water. Hoffman is a co-investigator for the TEGA experiment that flew on the Mars Scout Phoenix mission in 2007. The first observations of the polar wind, ions flowing out from the atmosphere, were made by his ion mass spectrometer flown on the ISIS spacecraft in 1971.ĭr.

JOHN HOFFMAN XRG PLUS

Hoffman has also flown mass spectrometers on earth orbiting satellites, Explorer 31, ISIS-II, AE-C, D, and E, and Wake Shield, plus numerous sounding rockets and stratospheric balloon flights. The atmosphere forms around a comet as it comes near the sun and is heated by radiation from the sun. The coma contains, besides water vapor and H30 ions, an extended source of carbon monoxide. It measured both the neutral and ionized constituents of the comet's coma. This instrument was developed by laboratories in four countries, three European and at UT Dallas. Hoffman was a member of the team who flew a mass spectrometer on the European Space Agency's Giotto mission to Halley's Comet in 1986. These isotopic ratio differences have had large implications on models of the nature of the solar nebula and the formation of the present (secondary) atmospheres of the terrestrial planets. A surprise discovery showed that for the two 'sister' planets there is a two order of magnitude difference in the isotopic ratios (the ratio of the heavier to lighter forms of these gases) for hydrogen and argon than for those gases on earth.

Carbon dioxide is the dominant gas in the atmosphere. Data was received throughout the descent of the probe to the surface. His instrument flew on the Pioneer Venus mission to Venus in 1978. There is an atmosphere on the moon composed mainly of noble gases and hydrogen, but the pressure is lower than that in the best vacuum systems on earth. The goal was to detect and determine the composition of the lunar atmosphere. He developed instruments for the Apollos 15, 16, and 17 lunar missions, the latter being part of the ALSEP surface package. His main interest was in the study of atmospheric/ionospheric composition and isotopic ratios for which he has developed instrument packages that have flown on many rockets and satellites. Hoffman joined the Graduate Research Center of the Southwest in 1966. These were flown on Aerobee and Javelin rockets.ĭr. C., developing miniaturized mass spectrometers for space flight. Naval Research Laboratory, Washington, D. His PhD dissertation was on the helium isotopic distribution in large iron meteorites. Nier who pioneered the field of mass spectroscopy.

Mary's College in Winona Minnesota and continued his education at the University of Minnesota under the mentorship of Professor A. John Hoffman received his bachelor's degree from St. University of Minnesota - 1951 Research Areas Overview

John hoffman xrg