Show simple item record

dc.contributor.advisor Freeman, John W.
dc.creatorSchneider, Henry Emil
dc.date.accessioned 2018-12-18T21:15:54Z
dc.date.available 2018-12-18T21:15:54Z
dc.date.issued 1975
dc.identifier.urihttps://hdl.handle.net/1911/103985
dc.description No page 28
dc.description.abstract The Rice University Suprathermal Ion Detector Experiment deployed on Apollo missions 12, 14, and 15 regularly observes ion events all through the lunar night. The ion events are most often less than 4 hours in duration, and usually less than one hour. The energy spectra of the events vary from mono-energetic at 25 eV/q to 5 eV/q to fairly broad. The energy represented may range from 25 eV/q to 15 eV/q. There is some indication that the peak energy of the events increases from 5 eV/q at local sunset to 75 eV/q at about 3 days before local sunrise and then decreases to 25 eV/q 1 day before the sunrise terminator crossing. The ion energies are generally less than the solar wind and the ion flux (1 ions/cm -sec-ster) is down by 2 orders of magnitude from the solar wind. Ion activity increases in the period 1 to 6 days prior to local sunrise with a peak at 2 to 3 days before sunrise. There is also a weak secondary activity peak 3 to 4 days after local sunset. Data from the Apollo 12 SIDE has not been looked at yet. The Apollo 14 and Apollo 15 SIDE 's both exhibit the same activity profile. This fact suggests a local lunar time dependence rather than a position in orbit for the occurrence of these events.
dc.format.extent 119 pp
dc.language.iso eng
dc.title An observation of lunar nighttime ions
dc.identifier.digital RICE1611
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Space Physics and Astronomy
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Science
dc.format.digitalOrigin reformatted digital
dc.identifier.callno Thesis Sp. Sci. 1975 Schneider
dc.identifier.citation Schneider, Henry Emil. "An observation of lunar nighttime ions." (1975) Master’s Thesis, Rice University. https://hdl.handle.net/1911/103985.


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record