Detection of He-4 in stratospheric particles gives evidence of extraterrestrial origin

Details Detection of He-4 in stratospheric particles gives evidence of extraterrestrial origin Detection of He-4 in stratospheric particles gives evidence of extraterrestrial origin

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.267..133r&link_type=abstract

Nature, vol. 267, May 12, 1977, p. 133, 134.

Computer Science

30

Extraterrestrial Matter, Helium Isotopes, Micrometeoroids, Stratosphere Radiation, Aeronomy, Particulate Sampling, Solar Wind

Scientific paper

During the past two years, large numbers of micrometer-sized stratospheric particles were collected by an inertial impaction collector attached to a NASA U-2 aircraft flown at 20 km. The collector consisted of a 20-sq cm oil-coated collection surface which was rammed through ambient air at the aircraft's cruise speed of 200 m/sec. Since surfaces exposed to the interplanetary medium usually contain relatively large amounts of He-4 due to implantation of solar wind, and ions from solar wind implant to depths of about 500 A in solid surfaces and form helium-rich layers on all exposed areas, the detection of large concentrations of He-4 in some of the particles suggests exposure to solar wind. The presence of He-4 also indicates that these particles, whose composition closely matches that of type C-1 carbonaceous chondrite micrometeorites, are true micrometeorites in the sense that they were not strongly heated by entry into the atmosphere, as strong heating would have caused much of the helium to escape.

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