NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The Mg II h and k lines. II - Comparison with synthesized profiles and Ca II KMeasured high-dispersion center and limb profiles of the solar Mg II h and k resonance lines are compared with synthetic spectra computed with a partial-redistribution formalism and based on several upper-photosphere and lower-chromosphere temperature distributions. Profiles of the analogously formed Ca II K resonance line are also synthesized for the same atmospheric models. The spectrum-synthesis approach is outlined, and the collisional and fixed radiative rates appropriate to the adopted model atoms and solar atmosphere are discussed. It is found that the HSRA and VAL models predict systematically lower intensities in the h, k, and K inner wings than observed and that models with a somewhat higher minimum temperature (about 4450 K) can reproduce the measured inner wings and limb darkening. A 'Ca II' solar model with a minimum temperature of 4450 K is proposed as an alternative to the class of models based on continuum observations.
Document ID
19760050468
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ayres, T. R.
(Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Linsky, J. L.
(Joint Institute for Laboratory Astrophysics Boulder, Colo., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1976
Publication Information
Publication: Astrophysical Journal
Volume: 205
Subject Category
Solar Physics
Accession Number
76A33434
Funding Number(s)
CONTRACT_GRANT: NAS5-23274
CONTRACT_GRANT: NGL-06-003-057
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available