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Lyman-alpha Detector

NSSDCA ID: 2008-010A-02

Mission Name: USA 200
Principal Investigator:Dr. David J. McComas


The TWINS Lyman-alpha detector consists of two independent sensors to measure Lyman-alpha radiation being emitted by neutral hydrogen atoms.

The sensors are oriented at angles of +/-40 degrees with respect to the actuator spin axis. Each sensor has a FWHM field of view of 4 degrees, defined by collimation hole baffles, uses Lyman-a interference filters as narrow band transmissions filters, and applies a KBr or CsI photodiode for photon detection.

The Lyman-alpha detector is located on the rotating actuator platform in order to provide a full 360 degree azimuthal angle coverage. It has a time resolution of 60 s.

Alternate Names

  • TWINS2/Lyman-alphaDetector

Funding Agency

  • NASA-Science Mission Directorate (United States)


  • Space Physics: Ionospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Dr. Natalia E. Papitashvili



NameRoleOriginal AffiliationE-mail
Dr. Ruth SkougCo-InvestigatorLos Alamos National Laboratory
Dr. Jerry GoldsteinGeneral ContactSouthwest Research
Dr. David J. McComasPrincipal InvestigatorSouthwest Research
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