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J/ApJS/91/461 EUV spectrum of solar active region (Thomas+, 1994)
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Extreme ultraviolet spectrum of a solar active region from SERTS
Thomas R.J., Neupert W.M.
<Astrophys. J. Suppl. Ser. 91, 461 (1994)>
=1994ApJS...91..461T (SIMBAD/NED Reference)
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ADC_Keywords: Sun; Spectra, ultraviolet
Keywords: Sun: activity - Sun: UV radiation
Abstract:
We present wavelengths and absolute intensities for 269 emission
lines from a single active region observed by the Solar EUV Rocket
Telescope and Spectrograph (SERTS) on 1989 May 5. For this catalog,
the imaged spectra have been spatially averaged over a field of view
7"x276" cutting through the center of AR5464 at S18 W45. Wavelength
coverage is 170-450A with a spectral resolution approaching 10,000.
Most of the line positions are determined to 5mA or better,
representing the highest accuracy yet obtained for solar wavelengths
throughout this spectral interval. The relative photometric
calibration of the instrument is good to +/-20% over its first-order
range, and has been placed onto an absolute scale that should be
correct to within a factor less than 2. Where known, identifications,
atomic transitions and formation temperatures are also given. The
identified lines arise from temperatures that cover the range
4.7<=logT<=6.8, providing information about the Sun's corona and upper
transition region. Upper limits to the intensity of any emission line
not included here can be estimated from the measured instrumental
sensitivity. This averaged EUV spectrum should prove useful as a
source of accurate wavelengths and intensities for emission
characteristic of the high-temperature plasma associated with a solar
active region and small subflare.
Keywords: Sun: activity - Sun: UV radiation
Addresses:
Thomas R.J. and Neupert W.M.
Laboratory for Astronomy and Solar Physics, Code 680,
NASA-Goddard Space Flight Center, Greenbelt, MD 20771
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 41 12 Wavelength calibration results
table2 44 44 Instrumental 3 sigma sensitivity levels versus
wavelength (first and second order)
table3 71 285 Solar active region EUV spectrum
notes3 79 47 Notes to table3
table4 95 245 Solar active region lines by ion
table5 66 30 Number of lines by ion in solar active region
EUV spectrum
table6 33 53 Unidentified lines in solar active region EUV
spectrum
spectrum 66 19446 Spectrum
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Byte-per-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 8 F8.2 5upix Cen Fitted line centroid
11- 18 F8.4 0.1nm SERTS Measured SERTS wavelength using calibration
relationship
21- 28 F8.4 0.1nm Std Known wavelength of line standard
31- 35 A5 --- Ion Ion of measured line standard
38- 41 F4.1 0.1pm Res Residual (SERTS - Std)
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Byte-per-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 3 I3 0.1nm Lam1 1st-order wavelength
6- 9 I4 10mW/m2/sr/nm 3sig(1) 1st-order spectral intensity
sensitivity (3-sigma)
12- 16 F5.1 mW/m2/sr 3L(1) 1st-order integrated intensity
sensitivity (3-sigma) (1)
25- 29 F5.1 0.1nm Lam2 []? 2nd-order wavelength
32- 36 I5 10mW/m2/sr/nm 3sig(2) []? 2nd-order spectral intensity
sensitivity (3-sigma)
39- 44 F6.1 mW/m2/sr 3L(2) []? 2nd-order integrated intensity
sensitivity (3-sigma) (1)
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Note (1): Values of 3L(1) and 3L(2) can be used as intensity upper limits for
lines not listed in table3.
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Byte-per-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 7 F7.3 0.1nm Lam Measured line wavelength
8 A1 --- n_Lam [ s] s = second-order line
11- 12 I2 0.1pm e_Lam 1-sigma uncertainty in Lambda
15- 21 F7.1 mW/m2/sr I Measured integrated line intensity
23- 29 F7.1 mW/m2/sr e_I 1-sigma uncertainty in I
32- 34 I3 0.1pm W Measured line full-width-half-maximum
37- 38 I2 0.1pm e_W 1-sigma uncertainty in W
41- 48 A8 --- Ion Emitting ion (if known)
49 A1 --- n_Ion [ b] b = blend
51- 54 F4.3 0.1nm Behr []? Fractional part of wavelength
reported by Behring et al. 1976
57- 59 F3.2 0.1nm Dere []? Fractional part of wavelength
reported by Dere 1978 plus
Feldman et al. 1987
62- 65 F4.3 0.1nm Kelly []? Fractional part of wavelength
reported by Kelly 1987
68 I1 --- ID Identification code (1)
70- 71 A2 --- Note Special note, see file notes3
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Note (1): 0 = Unidentified;
1 = Behring et al. 1976, ApJ, 203, 521
2 = Dere 1978, ApJ, 221, 1062
3 = Feldman et al. 1987, Atlas of Skylab EUV Spectroheliograms,
Washington, DC: Naval Research Laboratory
4 = This work using Kelly 1987, J. Phys. Chem. Ref. Data, 16, Suppl.,
1, 1371
5 = Keenan et al. 1991, ApJ, 379, 406
6 = Mason & Bhatia 1978, MNRAS, 184, 423
7 = Kastner 1991, Sol. Phys., 135, 343
8 = Behring 1992, private communication
9 = Monsignori-Fossi 1992, private communication
References:
Behring et al. 1976, ApJ, 203, 521
Dere 1978, ApJ, 221, 1062
Feldman et al. 1987, Atlas of Skylab EUV Spectroheliograms,
Washington, DC: Naval Research Laboratory
Kelly 1987, J. Phys. Chem. Ref. Data, 16, Suppl., 1, 1371
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Byte-per-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 8 A8 --- Ion Emitting ion
10- 12 F3.1 --- logT Temperature of maximum ionization
abundance
14- 20 F7.3 0.1nm Lam Measured line wavelength
22 A1 --- n1_Lam [ s] s = second order line
23 A1 --- n2_Lam [ b] b = blend
25- 26 I2 0.1pm e_Lam 1-sigma uncertainty in Lambda
28- 34 F7.1 mW/m2/sr I Measured integrated line intensity
36- 42 F7.1 mW/m2/sr e_I 1-sigma uncertainty in I
44- 59 A16 --- Config Electronic configurations involved in
the emission transition
60- 89 A30 --- Terms Electronic level terms involved in the
emission transition
91- 92 A2 --- IES Iso-electronic sequence of emitting ion
94- 95 I2 --- TN []? Transition number for the emission
line
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Byte-per-byte Description of file: table5
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z Atomic Z-number of emitting element
4- 5 A2 --- Ion Chemical symbol of emitting element
8- 9 I2 --- N(II) []? Number of lines observed from
ionization stage II of element
11- 12 I2 --- N(III) []? Lines from ionization stage III
14- 15 I2 --- N(IV) []? Lines from ionization stage IV
17- 18 I2 --- N(V) []? Lines from ionization stage V
20- 21 I2 --- N(VI) []? Lines from ionization stage VI
23- 24 I2 --- N(VII) []? Lines from ionization stage VII
26- 27 I2 --- N(VIII) []? Lines from ionization stage VIII
29- 30 I2 --- N(IX) []? Lines from ionization stage IX
32- 33 I2 --- N(X) []? Lines from ionization stage X
35- 36 I2 --- N(XI) []? Lines from ionization stage XI
38- 39 I2 --- N(XII) []? Lines from ionization stage XII
41- 42 I2 --- N(XIII) []? Lines from ionization stage XIII
44- 45 I2 --- N(XIV) []? Lines from ionization stage XIV
47- 48 I2 --- N(XV) []? Lines from ionization stage XV
50- 51 I2 --- N(XVI) []? Lines from ionization stage XVI
53- 54 I2 --- N(XVII) []? Lines from ionization stage XVII
56- 57 I2 --- N(XVIII) []? Lines from ionization stage XVIII
59- 60 I2 --- N(XIX) []? Lines from ionization stage XIX
62- 63 I2 --- N(XX) []? Lines from ionization stage XX
65- 66 I2 --- N(Total) []? Total number of lines observed from all
ions of given element
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Byte-per-byte Description of file: table6
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Bytes Format Units Label Explanations
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1- 7 F7.3 0.1nm Lam Measured line wavelength
8 A1 --- n_Lam [ s] s = all fields are interpreted as
appearing in 2nd-order, otherwise
they are in 1st-order
10- 11 I2 0.1pm e_Lam 1-sigma uncertainty in Lambda
13- 18 F6.1 mW/m2/sr I Measured integrated line intensity
20- 24 F5.1 mW/m2/sr e_I 1-sigma uncertainty in I
27- 29 I3 0.1pm W Measured line full-width-half-maximum
32- 33 I2 0.1pm e_W 1-sigma uncertainty in W
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Byte-by-byte Description of file: spectrum
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Bytes Format Units Label Explanations
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2- 9 F8.4 0.1nm N*Wave Spectral order times Wavelength
11- 18 F8.2 --- S Measured solar spectrum in
Relative Exposure Units (REU)
20- 26 F7.3 10mW/m2/sr/nm Ef Absolute Conversion Factor of REU,
1st-order
28- 34 F7.2 10mW/m2/sr/nm Es Absolute Conversion Factor, of REU
2nd-order
36- 42 F7.3 10ph/cm2/s/arcsec2/nm Pf Absolute Conversion Factor, of REU
1st-order
44- 50 F7.2 10ph/cm2/s/arcsec2/nm Ps Absolute Conversion Factor, of REU
2nd-order
52- 59 F8.2 --- So Raw spectral data, in REU
61- 66 F6.2 --- Back Background, in REU
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Origin: AAS CD-ROM series, Volume 2, 1994
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(End) Lee Brotzman [ADS] 11-May-1994, Patricia Bauer [CDS] 28-Oct-1994