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

X-ray and Lyman-Alpha Study

NSSDCA ID: 1960-007B-01

Mission Name: SOLRAD 1
Principal Investigator:Dr. Herbert D. Friedman


This experiment was designed to provide long-term observations of the ionizing radiation from the sun by monitoring the solar emission in the X-ray (2 to 8 A) and the hydrogen Lyman-alpha (1050 to 1350 A) regions. The measurements were made over the period June 22, 1960, to November 1, 1960, by two Lyman-alpha photometers and one X-ray photometer mounted on the equator of the satellite. The Lyman-alpha detectors were nitric oxide ion chambers, whereas the X-ray detector was an argon ion chamber. To eliminate the responses of the latter detector from Van Allen belt radiation (charged particles), a 2400-gauss permanent magnet was incorporated into the chamber design. This shielding magnet, however, had a significant effect upon the rotational stability of the satellite and, combined with other factors, was responsible for a severe reduction in the amount of data received. The data that were received, however, were of good quality.

Alternate Names

  • SOLRAD1/X-rayandLyman-AlphaStudy

Funding Agency

  • Department of Defense-Department of the Navy (United States)


  • Solar Physics: X-Ray
  • Solar Physics: Ultraviolet

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Herbert D. FriedmanPrincipal InvestigatorUS Naval Research Laboratory
[] NASA Logo -