116,009 research outputs found
New Interactive Solar Flare Modeling and Advanced Radio Diagnostics Tools
The coming years will see routine use of solar data of unprecedented spatial
and spectral resolution, time cadence, and completeness in the wavelength
domain. To capitalize on the soon to be available radio facilities such as the
expanded OVSA, SSRT and FASR, and the challenges they present in the
visualization and synthesis of the multi-frequency datasets, we propose that
realistic, sophisticated 3D active region and flare modeling is timely now and
will be a forefront of coronal studies over the coming years. Here we summarize
our 3D modeling efforts, aimed at forward fitting of imaging spectroscopy data,
and describe currently available 3D modeling tools. We also discuss plans for
future generalization of our modeling tools.Comment: 4 pages; IAU Symposium # 274 "Advances in Plasma Astrophysics"; typo
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Calculation of the Solar UV/EUV Spectrum in Spherical Symmetry
We present work in progress concerning spectral synthesis calculations of the
solar UV/EUV in spherical symmetry carried out with the Solar Radiation
Physical Modeling (SRPM) project. We compare the synthetic irradiance spectrum
for the quiet Sun with the recent solar minimum spectrum taken with the EVE
rocket instrument. The good agreement of the synthetic spectrum with the
observation shows that the employed atmosphere structures are suitable for
irradiance calculations.Comment: to appear in: Recent Directions in Astrophysical Quantitative
Spectroscopy and Radiation Hydrodynamics, edited by I. Hubeny, K. Macgregor,
and K. Werner, AIP Conference Proceeding
Empirical calibration of the near-IR Ca II triplet - I. The stellar library and index definition
A new stellar library at the near-IR spectral region developed for the
empirical calibration of the Ca II triplet and stellar population synthesis
modeling is presented. The library covers the range 8348-9020 Angstrom at 1.5
Angstrom (FWHM) spectral resolution, and consists of 706 stars spanning a wide
range in atmospheric parameters. We have defined a new set of near-IR indices,
CaT*, CaT and PaT, which mostly overcome the limitations of previous
definitions, the former being specially suited for the measurement of the Ca II
triplet strength corrected for the contamination from Paschen lines. We also
present a comparative study of the new and the previous calcium indices, as
well as the corresponding transformations between the different systems. A
thorough analysis of the sources of index errors and the procedure to calculate
them is given. Finally, index and error measurements for the whole stellar
library are provided together with the final spectra.Comment: 24 pages, 10 figures, LaTeX. For associated spectra, tables and
software, see http://www.ucm.es/info/Astrof/ellipt/CATRIPLET.html or
http://www.nottingham.ac.uk/~ppzrfp/CATRIPLET.htm
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