Calibration of Solar Radio Spectrometer of the Purple Mountain Observatory

Lu, Ling; Liu, Siming; Song, Qing; Ning, Zhouyu

doi:10.1016/j.chinastron.2015.10.007

“…Тем не менее, инструментальное покрытие метрового диапазона оставляет желать лучшего. Кроме того, для полноценного исследования процесса излучения и спектрального распределения, а также для сравнения между собой данных разных инструментов необходимо, чтобы проводимые измерения солнечного излучения были абсолютными, т. е. получена конкретная физическая величина на калиброванном инструменте [Tapping, 2013;Lu et al, 2015;Tan et al, 2015].…”

Section: Introductionunclassified

Correlation analysis of solar flux absolute measurements at 161 and 245 MHz

Setov,

Kushnarev

2023

Solnechno-Zemnaya Fizika

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Solar emission in meter waves originates from upper layers of the solar corona. We present absolute measurements of solar flux from Irkutsk Incoherent Scatter Radar (161 MHz frequency) and Learmonth Observatory (245 MHz frequency). We perform correlation analysis to investigate the relation between solar flux values at different frequencies. Background emission of the quiet Sun is within the expected limits. We examine the behavior of background and slowly-varying emission components during a solar cycle. By comparing the Pearson correlation coefficient with the Spearman rank correlation coefficient, we have found that the dependence of the meter flux on the F10.7 index is non-linear. The correlation between solar flux measurements at 161 and 245 MHz appeared to be lower than that with the F10.7 index. Analysis of daily correlation and autocorrelation shows a diurnal variation that introduces an error into the measurements.

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Correlation analysis of solar flux absolute measurements at 161 and 245 MHz

Setov,

Kushnarev

2023

Solar-Terrestrial Physics

0

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Solar emission in meter waves originates from upper layers of the solar corona. We present absolute measurements of solar flux from Irkutsk Incoherent Scatter Radar (161 MHz frequency) and Learmonth Observatory (245 MHz frequency). We perform correlation analysis to investigate the relation between solar flux values at different frequencies. Background emission of the quiet Sun is within the expected limits. We examine the behavior of background and slowly-varying emission components during a solar cycle. By comparing the Pearson correlation coefficient with the Spearman rank correlation coefficient, we have found that the dependence of the meter flux on the F10.7 index is non-linear. The correlation between solar flux measurements at 161 and 245 MHz appeared to be lower than that with the F10.7 index. Analysis of daily correlation and autocorrelation shows a diurnal variation that introduces an error into the measurements.

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Development of a 90–600 MHz Meter-wave Solar Radio Spectrometer

Chang 常,

Wang 王,

Lu 路

et al. 2024

ApJS

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Radio observation is important for understanding coronal mass ejections (CMEs), coronal shock waves, and high-energy electron acceleration. Here, we developed a new Chashan broadband solar radio spectrometer at a meter wavelength for observing the (super)fine structure of the solar radio burst spectrum. In the signal-receiving unit, we adopt an antenna system consisting of a 12 m large-aperture parabolic reflector and dual-line polarized logarithmic periodic feed source, as well as a high-precision Sun-tracking turntable system, all of which ensure the high-precision acquisition of solar radiation signals. For the digital receiver, we use a high-speed analog-to-digital converter with a sampling rate of 1.25 GSPS to directly sample the signal amplified and filtered by the analog receiver, simplifying the structure of the analog receiver, and design a 16k-point fast Fourier transform algorithm in the field programmable gate array to perform time–frequency transformation on the sampled signals. The default frequency and temporal resolution of the system are 76.294 kHz and 0.839 ms (up to 0.21 ms), respectively. The noise coefficient of the system is less than 1 dB, the dynamic range is more than 60 dB, and the sensitivity is as high as 1 sfu. We have observed a large number of radio bursts, including type I radio storms, hundreds of type III, ∼20 type II, and ∼15 type IV bursts in the past year. These high-quality data are useful in the further study of CMEs and associated particle acceleration and the origins of solar radio bursts.

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Calibration of Solar Radio Spectrometer of the Purple Mountain Observatory

Cited by 3 publications

References 66 publications

Correlation analysis of solar flux absolute measurements at 161 and 245 MHz

Correlation analysis of solar flux absolute measurements at 161 and 245 MHz

Correlation analysis of solar flux absolute measurements at 161 and 245 MHz

Development of a 90–600 MHz Meter-wave Solar Radio Spectrometer

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