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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1811| Synthetic spectra of radio, millimeter, sub-millimeter, and infrared regimes with non-local thermodynamic equilibrium approximation | |
| Victor De la Luz | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Methods: numerical Radiation mechanisms: thermal Radiative transfer Sun: atmosphere Sun:chromosphere Sun: radio radiation | |
| We use a numerical code called PAKALMPI to compute synthetic spectra of the solar emission in quiet conditions at millimeter, sub-millimeter, and infrared wavelengths. PAKALMPI solves the radiative transfer equation, with nonlocal thermodynamic equilibrium (NLTE), in a three-dimensional geometry using a multiprocessor environment. The code is able to use three opacity functions: classical bremsstrahlung, HⲺ, and inverse bremsstrahlung. In this work, we have computed and compared two synthetic spectra, one in the common way: using bremsstrahlung opacity function and considering a fully ionized atmosphere; and a new one considering bremsstrahlung, inverse bremsstrahlung, and HⲺ opacity functions in NLTE.We analyzed in detail the local behavior of the low atmospheric emission at 17, 212, and 405 GHz (frequencies used by theNobeyamaRadioHeliograph and the Solar Submillimeter Telescope). We found that the HⲺ is the major emission mechanism at low altitudes (below 500 km) and that at higher altitudes the classical bremsstrahlung becomes the major mechanism of emission. However, the brightness temperature remains unalterable. Finally, we found that the inverse bremsstrahlung process is not important for radio emission at these heights. | |
| The Astrophysical Journal | |
| 10-08-2011 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| De la Luz, V., et al., (2011), Synthetic spectra of radio, millimeter, sub-millimeter, and infrared regimes with non-local thermodynamic equilibrium approximation, The Astrophysical Journal, Vol.737(1):1-9 | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
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