Synthetic spectra of radio, millimeter, sub-millimeter, and infrared regimes with non-local thermodynamic equilibrium approximation

dc.creatorVictor De la Luz
dc.date2011-08-10
dc.date.accessioned2023-07-25T16:24:22Z
dc.date.available2023-07-25T16:24:22Z
dc.identifierhttp://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1811
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7807003
dc.descriptionWe 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.
dc.formatapplication/pdf
dc.languageeng
dc.publisherThe Astrophysical Journal
dc.relationcitation: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
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectinfo:eu-repo/classification/Inspec/Methods: numerical
dc.subjectinfo:eu-repo/classification/Inspec/Radiation mechanisms: thermal
dc.subjectinfo:eu-repo/classification/Inspec/Radiative transfer
dc.subjectinfo:eu-repo/classification/Inspec/Sun: atmosphere
dc.subjectinfo:eu-repo/classification/Inspec/Sun:chromosphere
dc.subjectinfo:eu-repo/classification/Inspec/Sun: radio radiation
dc.subjectinfo:eu-repo/classification/cti/1
dc.subjectinfo:eu-repo/classification/cti/21
dc.subjectinfo:eu-repo/classification/cti/21
dc.titleSynthetic spectra of radio, millimeter, sub-millimeter, and infrared regimes with non-local thermodynamic equilibrium approximation
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.audiencestudents
dc.audienceresearchers
dc.audiencegeneralPublic


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