J/A+A/581/A26 Solar Lyman irradiance line profiles (Lemaire+, 2015)
Hydrogen Ly-α and Ly-β full Sun line profiles observed with
SUMER/SOHO (1996-2009).
Lemaire P., Vial J.-C., Curdt W., Schuhle U., Wilhelm K.
<Astron. Astrophys. 581, A26 (2015)>
=2015A&A...581A..26L 2015A&A...581A..26L
ADC_Keywords: Sun ; Line Profiles
Mission_Name: SOHO
Keywords: Sun: chromosphere - Sun: UV irradiance - Sun: heliosphere -
Abstract:
Accurate hydrogen spectra emitted by the entire solar disc in the
Ly-α and Ly-β lines are valuable for deriving the
distribution and the behaviour of atomic hydrogen in the heliosphere,
for understanding the UV emissions of solar type stars better, and
finally for estimating the solar energy input that mainly initiates
the chemical processes occurring in the planetary and cometary outer
atmospheres.
In this paper we want to accurately determine the irradiance solar
spectral profiles of Ly-α and Ly-β and their evolution
through the solar activity cycle 23.
The SUMER/SOHO spectrometer is a slit spectrometer that is only able
to analyse a small part of the solar image. Consequently, we used
the scattered light properties of the telescope to obtain average
spectra over the solar disc. Then the profile is calibrated using the
SOLSTICE/UARS and TIMED/SEE irradiance spectra.
Description:
Set of irradiance Ly-α and Ly-β solar spectra with a
0.002nm resolution through the solar activity cycle 23. The wavelength
distance from line center is given every 0.001nm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 59 82 List of Ly-α and Ly-β observations
sp/* . 82 *Individual spectral line profiles of the photon
irradiance during the 2006-2009 years,
data deconvolved with the SUMER PSF
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Note on sp/*: the helium HeII 102.524nm line is detected in the blue wing of
Ly-β (Ebadi et al., 2009)
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See also:
J/A+A/309/655 : Solar chromospheric activity (HeI 10830A) (Shcherbakov+ 1996)
J/A+A/313/949 : Solar chromospheric structures. II. (Bocchialini+, 1996)
J/A+A/375/591 : SUMER Spectral Atlas of Solar Disk Features (Curdt+, 2001)
J/A+A/390/707 : Hemispheric Sunspot Numbers 1975-2000 (Temmer+, 2002)
J/A+A/447/735 : Hemispheric Sunspot Numbers 1945-2004 (Temmer+, 2006)
J/A+A/539/A13 : Solar bipolar magnetic fields (Yamamoto, 2012)
J/A+A/552/A114 : Sun chromospheric CaII-HK emission (Shapiro+, 2013)
J/A+A/574/A37 : Movies of 2012-10-16 solar flare (Dalmasse+, 2015)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Line Line (Ly-α or Ly-β)
12- 22 A11 "YYYY-MMM-DD" Obs.date Observation date
24- 28 A5 "h:m" Obs.time Observation time
30- 53 A24 --- FileName Name of the file in subdirectory sp
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 8 F8.4 nm dlambda Wavelength difference
(λ-λ0) (1)
21- 30 E10.4 ph/cm2/s/nm Irr Photon irradiance
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Note (1): λ0=121.567nm for Ly-α and 102.572nm for Ly-β.
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Acknowledgements:
Philippe Lemaire, philippe.lemaire(at)ias.u-psud.fr
(End) Patricia Vannier [CDS] 16-Jul-2015