Labels:text | screenshot | font | black and white | menu | number | parallel OCR: Passive seismic X X X X X Total of 16 seismometers; moonquakes occur, but Moon seismically quieter than Earth Active seismic × x Thumper, grenades, and Lunar-surface geophones x × × Measure solar and magnetometer terrestrial magnetic fields Solar-wind × X Measure solar-wind speed, spectrometer direction, and density Suprathermal X X X Ions from inter planetary ion detector storms and solar flares detected Heat flow × x Surface-soil mean temperature - 67º C (-90º F) ; at 90 cm ( 35 in) depth, - 45º C ( - 49º F) Charged particle x Measure proton and electron Cold cathode gauge impacts × × × Vacuum gauge and electrometer measure gases Lunar geology escaping from interior × × × × XX Eyewitness accounts and Laser-ranging photographs × × × Laser on Earth and reflector retroreflector on Moon determine mean lunar distance to within 15 cm (5.9 in) Cosmic-ray x Tracks in lexan and mica detector furnish information on cosmic-ray sources Portable x Measurements of permanent magnetometer magnetic fields show lunar materials magnetized 3 to 4 billion years ago Traverse x Information on substructure gravimeter of Moon Soil mechanics × × × × × Penetrometer shows lunar soil behavior similar to Earth soils Far UY camera- X Ultraviolet spectra of spectrograph selected celestial sources Lunar ejecta x Film sensors detect high- and meteorites velocity particle impacts Lunar seismic x Explosives and geophones profiling determine lunar crust characteristics to 5 km (3 mi) depth Surface electrical × Dipole antennae detect properties Lunar atmospheric electromagnetic fields x Mass spectrometer finds composition traces of argon, neon, hydrogen, and helium Lunar surface x Cosmic gravity waves not gravimeter detected Neutron probe x Cellulose and mica detectors measure nuclear reactions in soil from cosmic rays Dust detector x X X X Effects of lunar environment of solar cells measured *ALSEP experiments do not include orbital experiments or those returned to Earth. SOURCE: NASA.
