| Zugriffsnummer | 16396 |
| Dokumenttyp | Bericht |
| Sprache | Englisch |
| Titel | Solar vacuum-ultraviolet radiometry with sumer |
| Autor(in); Institution |
Wilhelm, Klaus; Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, GERMANY
Schühle, Udo; Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, GERMANY
Curdt, Werner; Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, GERMANY
Dammasch, Ingolf E.; Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, GERMANY
Hollandt, Jörg; 7.21, Temperaturstrahlung, PTB-Berlin
Lemaire, Philippe; Institut d'Astrophysique Spatiale, Unité Mixte, CNRS-Université Paris XI, Orsay, FRANCE
Huber, Martin C. E.; ESA, Space Science Department, Noordwijk, The Netherlands
|
| Quelle/Jahr | The Radiometric Calibration of SOHO:(2002), 145 - 160 |
| Schriftenreihe | ISSI scientific report: 2 |
| Herausgeber(in) |
Pauluhn, Anuschka
Huber, Martin C. E.
Steiger von, Rudolf
|
| Berichtsnummer | SR-002 |
| Verlag | Noordwijk: ESA |
| Zusammenfassung | Since the beginning of 1996, the space-based telescope and spectrograph SUMER (Solar Ultraviolet Measurements of Emitted Radiation) on the Solar and Heliospheric Observatory (SOHO) of ESA and NASA has obtained spectra of many features of the quiescent and active Sun with high spectral and spatial resolution. In addition, irradiance and radiance measurements of line and continuum emission have been performed in the wavelength range 46.5 nm to 161.0 nm. The instrument was radiometrically calibrated against the Berlin Electron Storage ring for Synchrotron radiation (BESSY I), a primary source standard, with the help of a transfer source standard based on a hollow-cathode discharge lamp. A thorough cleanliness programme, specifically aimed at chemical contamination control, resulted in an excellent radiometric stability of the normal-incidence optical system as well as of the detectors. This has been verified under operational conditions by various techniques employed during the SOHO mission, such as line-ratio studies, observations of stars, and comparisons with other instruments. The observation provide vacuum-ultraviolet (VUV) radiometry of the Sun in many emission lines and continua of atoms and ions with relative standard uncertainties of 15 % (detector A) and 20 % (detector B) for the wavelength range 53 nm to 124 nm, with larger uncertainties outside this interval and after the SOHO recovery in 1998. We report on the present state of the SUMER radiometric calibration and provide a full bibliography related to this topic. |
