NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Apollo12_SWS_28s CDF, Solar Wind Spectrometer 28-s Resolution (LDP)


Availability: At NSSDC, Ready for Electronic Access


This data set was reformatted from the original binary data set PSFP-00118 in December 2006 by NSSDC as part of the Lunar Data Restoration project. The data were put into CDF format for easier access and use. This data set contains 28-s resolution plasma parameters (mainly of the solar wind) as observed on the moon at the Apollo 12 ALSEP site. This is the highest resolution data set available from the SWS instrument.

Contained in each record are time, proton density, alpha-to-proton ratio, bulk speed, angle of flow, most probable thermal speed, and various housekeeping and fit parameters relating to the reliability of the calculated plasma parameters.

During the local lunar night there is no solar wind signal so there are data gaps of about 15 days each lunation.

The data set is available for user-selected plotting or data download at NSSDC's interactive CDAWeb site:

under the source "Apollo". The data are also available as PDS data sets, see:

Alternate Names

  • Apollo12_SWS_28s SW Spectrom. CDF


  • Planetary Science: Atmospheres
  • Space Physics: Heliospheric Studies

Additional Information



Questions and comments about this data collection can be directed to: Dr. H. Kent Hills



NameRoleOriginal AffiliationE-mail
Dr. Conway W. SnyderData ProviderNASA Jet Propulsion Laboratory
Dr. Marcia M. NeugebauerGeneral ContactNASA Jet Propulsion

Selected References

  • Neugebauer, M., et al., Solar wind observations on the lunar surface with the Apollo-12 ALSEP, Planet. Space Sci., 20, 1577-1591, doi:10.1016/0032-0633(72)90184-5, Oct. 1972.
  • Clay, D. R., et al., Lunar surface solar wind observations at the Apollo 12 and Apollo 15 sites, J. Geophys. Res., 80, No. 13, 1751-1760, doi:10.1029/JA080i013p01751, May 1975.
  • Bates, J. R., et al., ALSEP termination report, NASA, RP-1036, Wash., DC, Apr. 1979.
  • Snyder, C. W., et al., The solar-wind spectrometer experiment, in Apollo 12 Preliminary Science Report, NASA SP-235, 75-81, 1970.

Related Data/Information at NSSDCA

Apollo 12 Solar Wind Spectrometer Hour Average Data Record
Apollo 12 Solar Wind Spectrometer 28 s Average Data Record
Apollo 15 Solar Wind Spectrometer Hour Average Data Record
Apollo 15 Solar Wind Spectrometer 28s Average Data Record

Related Information at NSSDCA

Apollo landing sites and ALSEP and LRRR locations - and information on the modified DMA/603 control network

Lunar Data Project
Apollo Home Page

Solar Wind Spectrometer Available On-line

Solar Wind Spectrometer and other lunar data on CDAWeb
Solar Wind Spectrometer and other Apollo data at the Planetary Data System

[] NASA Logo -