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Branching ratios for the radiometric calibration of eunis-2012
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Daw, Adrian N. Rabin, Douglas M. Bhatia, A. K. |
| Copyright Year | 2012 |
| Description | The Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) sounding rocket instrument is a two-channel imaging spectrograph that observes the solar corona and transition region with high spectral resolution and a rapid cadence made possible by unprecedented sensitivity. The upcoming flight will incorporate a new wavelength channel covering the range 524-630 Angstroms, the previously-flown 300-370 Angstroms channel, and the first flight demonstration of cooled active pixel sensor (APS) arrays. The new 524-630 Angstrom channel incorporates a Toroidal Varied Line Space (TVLS) grating coated with B4C/Ir, providing broad spectral coverage and a wide temperature range of 0.025 to 10 MK. Absolute radiometric calibration of the two channels is being performed using a hollow cathode discharge lamp and NIST-calibrated AXUV-100G photodiode. Laboratory observations of He I 584 Angstroms and He II 304 Angstroms provide absolute radiometric calibrations of the two channels at those two respective wavelengths by using the AXUV photodiode as a transfer standard. The spectral responsivity is being determined by observing line pairs with a common upper state in the spectra of Ne I-III and Ar II-III. Calculations of A-values for the observed branching ratios are in progress. |
| File Size | 77878 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120015578 |
| Archival Resource Key | ark:/13960/t1tf4sq5v |
| Language | English |
| Publisher Date | 2012-09-30 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Radiometers Solar Corona Spectrographs Spectral Resolution Calibrating Helium Isotopes Photodiodes Extreme Ultraviolet Radiation Sounding Rockets Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
