Type II Solar Radio Bursts observed by Chashan Solar radio Observatory (CSO) of Institute of Space Sciences, Shandong University

  Here we release the spectral data of solar radio bursts recorded by the Chashan Broadband Solar radio spectrograph (CBSm), that is located within the Chashan mountain (E122°.30, N36°.84), the southmost part of Shandong Peninsula of China.

CBSm is supported by the Chinese Meridian Space Weather Monitoring Project (II). It is designed and operated by the Laboratory for ElectromAgnetic Detection of Institute of Space Sciences (LEAD, ISS), Shandong University.

CBSm observes the Sun from 90 to 600 MHz with a 12m parabolic antenna fed by a dual-polarization LPDA feed. Its receiver adopts a high-speed two-channel 14-bit ADC acquisition card, with a sampling rate of 1.25 GSPS. The CBSm receiver implements a 16k-point FFT algorithm with FPGA KU115. The default frequency and temporal resolutions of CBSm data 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 that is estimated for integration within 1ms and a bandwidth of 100 kHz at 300 MHz.

The CBSm started its routine observation since Nov. 2022. It has recorded many radio bursts, including type I bursts that may last for weeks, hundreds of type IIIs, tens of type II and IV bursts, despite relatively-strong signals of radio interference.

Here we released data of the CBSm type II bursts together with some intriguing bursts with fine spectral structures. To get these spectrographs, we have integrated the original data within 100 ms and 610kHz for a better signal-noise ratio. We are working to calibrate these data in both brightness intensities and levels of polarizations. The daily spectra data ( daily view JPG and daily fits ) can be viewed online by visiting http://47.104.87.104/SRData/CBSm/dailyView/ and/or http://47.104.87.104/SRData/CBSm/dailyFits/.

The introduction to CBSm can be found online at https://iopscience.iop.org/article/10.3847/1538-4365/ad3de7. Please contact Dr. Yao CHEN (the chief scientist of CBSm) at yaochen@sdu.edu.cn for collaborations in scientific research on solar radio bursts. For the high-resolution data of the bursts, or other inquiries, please contact Dr. Bing Wang at wbing@sdu.edu.cn.