The TIMED solar EUV experiment
- National Center for Atmospheric Research, Boulder, CO (United States). High Altitude Observatory
- Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
- Naval Research Lab., Washington, DC (United States)
- Jet Propulsion Lab., Pasadena, CA (United States). Telos Group
The Solar EUV Experiment (SEE) investigation contributes primarily to the NASA Thermosphere, Ionosphere, and Mesosphere Energetics and Dynamics (TIMED) mission goal to characterize the sources of energy responsible for the thermal structure of the mesosphere, the lower thermosphere, and the ionosphere (MLTI). These energy sources include solar radiation, solar energetic particles, Joule heating, conduction, dynamical forcing, and chemical energy release. Of these energy inputs, the solar vacuum ultraviolet (VUV) radiation below 200 nm is the dominant global energy source for heating of the thermosphere, creating the ionosphere, and driving the diurnal cycles of wind and chemistry. The Solar EUV Experiment selected for the NASA TIMED mission will measure the solar vacuum ultraviolet (VUV) spectral irradiance from 0.1 to 200 nm. To cover this wide spectral range two different types of instruments are used: a grating spectrograph for spectra above 25 nm and an avalanche photodiode for spectra below 25 nm. As part of the in-flight calibration plan, silicon XUV photodiodes with thin film filters are used as stable broadband photometers between 0.1 and 40 nm. In addition, redundant spectrograph and avalanche photodiode capabilities provide calibration checks on the time scale of a month, and annual rocket underflight measurements provide absolute calibration checks traceable to NIST photometric standards. All three types of instruments have been developed and flight proven as part of a NASA solar EUV irradiance rocket experiment.
- OSTI ID:
- 227974
- Report Number(s):
- CONF-940723-; ISBN 0-8194-1590-1; TRN: IM9622%%251
- Resource Relation:
- Conference: Annual meeting of the Society of Photo-Optical Instrumentation Engineers, San Diego, CA (United States), 24-29 Jul 1994; Other Information: PBD: 1994; Related Information: Is Part Of Optical spectroscopic techniques and instrumentation for atmospheric and space research; Wang, J.; Hays, P.B. [eds.]; PB: 662 p.; Proceedings/SPIE, Volume 2266
- Country of Publication:
- United States
- Language:
- English
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