Solar-flare-implanted [sup 4]He/[sup 3]He and solar-proton-produced Ne and Ar concentration profiles preserved in lunar rock 61016

Journal Article · Sat May 01 00:00:00 EDT 1993 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/93JA00002· OSTI ID:6427162

Rao, M N ^[1]; Garrison, D H ^[2]; Bogard, D D ^[3]; Reedy, R C ^[4]

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1. Lunar Planetary Inst., Houston, TX (United States)
2. Lockheed Engineering and Sciences Co., Houston, TX (United States) NASA, Houston, TX (United States)
3. NASA, Houston, TX (United States)
4. Los Alamos National Lab., NM (United States)

The authors report on isotopic measurements made on lunar rock 61016, which is one of the limited number with a known orientation history. They measure solar flare implanted [sup 4]He/[sup 3]He ratios and the depth profiles of [sup 21]Ne, [sup 22]Ne, and [sup 38]Ar isotopes produced from in situ nuclear reactions of solar flare protons with the silicate rock. They are able to distinguish solar flare from galactic cosmic ray sources of these isotopes. They find that the helium isotope ratios are energy dependent, reporting measurements for solar wind nuclei, with energies down to keV amu[sup [minus]1], and for solar flare nuclei with energies above 1 and 4 MeV amu[sup [minus]1]. Respective ratios are 2695[-+]81, 3450[-+]725, and 770[-+]316.

• OSTI ID: 6427162
• Journal Information: Journal of Geophysical Research; (United States), Vol. 98:A5; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
LUNAR MATERIALS
PROTON REACTIONS
SOLAR ALPHA PARTICLES
ION IMPLANTATION
SOLAR PROTONS
NUCLEAR REACTIONS
ARGON 38
HELIUM 3
HELIUM 4
KEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEON 21
NEON 22
PROTONS
SOLAR FLARES
SOLAR WIND
ALPHA PARTICLES
ARGON ISOTOPES
BARYON REACTIONS
BARYONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRON REACTIONS
HADRONS
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATERIALS
MEV RANGE
NEON ISOTOPES
NUCLEI
NUCLEON REACTIONS
NUCLEONS
RADIATIONS
SOLAR ACTIVITY
SOLAR PARTICLES
SOLAR RADIATION
STABLE ISOTOPES
STELLAR RADIATION
661300* - Other Aspects of Physical Science- (1992-)