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J/ApJ/543/1016 EUV spectrum of solar active region from SERTS-97 (Brosius+ 2000)

Analysis of a solar active region extreme-ultraviolet spectrum from SERTS-97. Brosius J.W., Thomas R.J., Davila J.M., Landi E. <Astrophys. J. 543, 1016 (2000)> =2000ApJ...543.1016B
ADC_Keywords: Sun ; Spectra, ultraviolet ; Spectroscopy Mission_Nane: SOHO Keywords: instrumentation: spectrographs - line: identification - Sun: activity - Sun: corona - Sun: UV radiation Abstract: Goddard Space Flight Center's Solar EUV Research Telescope and Spectrograph was flown on 1997 November 18, carrying an intensified CCD detector and a multilayer-coated toroidal diffraction grating with enhanced sensitivity over that of a standard gold-coated grating throughout the instrument's 299-353Å spectral bandpass. Spectra and spectroheliograms of NOAA Active Region 8108 (N21°, E18°) were obtained with a spectral resolution (instrumental FWHM) of 115mÅ. Nearly 100 emission lines were observed in the spatially averaged active region spectrum. Spectra and spectroheliograms of quiet areas south of the region were also obtained. An end-to-end radiometric calibration of the rocket instrument was carried out at the Rutherford-Appleton Laboratory in the same facility that was used to calibrate the Coronal Diagnostic Spectrometer experiment on SOHO and using the same EUV light source. The accuracy of this calibration is confirmed by the excellent agreement between the measured and theoretical values of density- and temperature-insensitive line intensity ratios. Nine emission lines of Fe XV are identified in our spectrum; however, large differences between wavelengths in the CHIANTI database and some of the measured solar wavelengths, as well as inconsistencies of various theoretical intensity ratios, suggest a need for improvement in the Fe XV atomic physics parameters and/or the presence of unidentified blending lines. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 68 95 SERTS-97 absolutely calibrated active region line list notes1.dat 80 47 Notes to table1 table2.dat 43 15 Confirmation of the SERTS-97 calibration with density- and temperature-insensitive line intensity ratios (insensitive ratios) table3.dat 31 24 Emission lines used to derive active region differential emission measure (DEM)
See also: J/A+AS/113/237 : Ultraviolet Spectrum of the Sun (Samain, 1995) J/A+AS/129/41 : Fe I line shifts in the Sun (Allende Prieto+ 1998) J/A+A/304/563 : Cool X-ray flares of Sun with GOES (Phillips+, 1995) J/ApJS/120/409 : The SMM Atlas of Gamma-Ray flares (Vestrand+, 1999) J/A+AS/103/57 : Ion-atom collisions in Sun atmosphere (Mihajlov+ 1994) J/A+AS/131/431 : Accurate wavelengths in Sun spectrum (Allende Prieto+ 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 F7.3 0.1nm lambda Wavelength 9- 15 F7.1 mW/m2/sr Int Intensity 17- 22 F6.1 mW/m2/sr e_Int rms uncertainty on Int 24- 28 F5.1 0.1pm FWHM Measured width, including instrumental, thermal, and nonthermal contributions 30- 32 F3.1 0.1pm e_FWHM rms uncertainty on FWHM 34- 41 A8 --- Ion Ion 42- 44 F3.2 0.1nm Flare ? Flare fractional portion of lambda (Dere, 1978ApJ...221.1062D) 46- 49 F4.3 0.1nm Active ? Active fractional portion of lambda (Thomas & Neupert 1994, Cat. J/ApJS/91/461) 51- 54 F4.3 0.1nm Full ? Full fractional portion of lambda (Behring et al., 1976ApJ...203..521B) 56- 59 F4.3 0.1nm Quiet ? Quiet fractional portion of lambda (Brooks et al. 1999A&A...347..277B, in which the shortest wavelength is 308.515Å) 61- 66 A6 --- Note Notes detailed in notes1.dat file
Byte-by-byte Description of file: notes1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Note Note number 4- 80 A77 --- Text Text of the note
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Ion Ion line ratio 9- 13 F5.1 0.1nm lambda1 First wavelength 14 A1 --- --- [/] 15- 19 F5.1 0.1nm lambda2 Second wavelength 21- 25 F5.3 --- RatioT Theoretical line ratio 27- 31 F5.3 --- e_RatioT ? rms uncertainty on RatioT 33- 37 F5.3 --- RatioM Measured line ratio 39- 43 F5.3 --- e_RatioM ? rms uncertainty on RatioM
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Ion Ion 10- 16 F7.3 0.1nm lambda Wavelength 18- 21 F4.2 K Teff Effective temperature (1) 23- 26 F4.2 --- lobs/ldem Ratio of the observed intensity to the theoretical intensity derived from the differential emission measure (DEM) 28- 31 F4.2 --- e_lobs/ldem rms uncertainty on lobs/ldem
Note (1): Effective temperature, as defined by Landi & Landini (1997A&A...327.1230L). This is not the same as the formation temperature (the temperature of maximum ion abundance), for which examples derived from the Mazzotta et al. (1998, Cat. J/A+AS/133/403) ion fraction calculations are given in Sect. 4.2 of the paper.
History: From ApJ electronic version
(End) Patricia Bauer [CDS] 12-Feb-2001
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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