2015
DOI: 10.1088/0004-637x/808/1/61
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Study of Calibration of Solar Radio Spectrometers and the Quiet-Sun Radio Emission

Abstract: This work presents a systematic investigation of the influence of weather conditions on the calibration errors by using Gaussian fitness, least chi-square linear fitness and wavelet transform to analyze the calibration coefficients from observations of the Chinese Solar Broadband Radio Spectrometers (at frequency bands of 1.0-2.0 GHz, 2.6-3.8 GHz, and 5.2-7.6 GHz) during 1997-2007. We found that calibration coefficients are influenced by the local air temperature. Considering the temperature correction, the ca… Show more

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Cited by 21 publications
(18 citation statements)
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“…The observed solar flux density is computed in two units via Eq. (12). The first is the Solar Flux Unit (SFU), and the second is the Jansky (Jy).…”
Section: The Results and Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…The observed solar flux density is computed in two units via Eq. (12). The first is the Solar Flux Unit (SFU), and the second is the Jansky (Jy).…”
Section: The Results and Discussionmentioning
confidence: 99%
“…There are several solar broadband radio spectrometers running in the world, such as Phoenix at ETH Zurich (100-4000) MHz, Ondrejov Radio Spectrograph in the Czech Republic (800-5000) MHz, and Brazil broadband spectrometer (200-2500) MHz. All the above spectrometers are single dish telescopes which receive the radio emission of the full solar disk without spatial resolution [12].…”
Section: Introductionmentioning
confidence: 99%
“…We assume the attenuation of the flux is due to the propagation effect. The model (shown in Appendix) considers the free-free emission and absorption in a straight LOS, while in the meter-wave and decameter-wave bands, refraction and scattering can significantly deviate the wave propagation path from the straight line, and thus influence the imaging results (Tan et al 2015;Kontar et al 2019;Zhang et al 2021). The Monte Carlo simulation of radio-wave propagation ray tracing (Thejappa & MacDowall 2008) with the plasma background density fluctuation is described by two parameter combinations: (1) a spectral index of 11/3 representing Kolmogorov spectrum with fluctuation level ò = 0.1; (2) a spectral index of 3, representing a flat spectrum with fluctuation level ò = 0.02.…”
Section: Discussionmentioning
confidence: 99%
“…The brightness temperature spectrum of the quiet Sun can be numerically derived from a model of the density and temperature of the solar atmosphere considering the bremsstrahlung radiation, by numerically integrating the radiation transfer equation along the LOS (Selhorst et al 2005;Tan et al 2015;Selhorst et al 2019):…”
Section: Appendix Model Of Brightness Temperature Spectrummentioning
confidence: 99%
“…Another calibration method is usually referred to as the Y-factor method (see, e.g., Tan et al 2015).…”
Section: Data Calibrationmentioning
confidence: 99%