Radioheliographs and wideband photo voltaic radio spectrographs are important parts of the Chinese language Meridian Venture (CMP)‐II (C. Wang et al., 2024) that goals to watch the entire photo voltaic‐terrestrial chain of area climate occasions, from the decrease photo voltaic environment to close‐Earth area. This work introduce the CMP‐II radio devices, together with the MUSER‐L/I/H, the tremendous‐wideband spectrographs of Mingantu and Chashan stations masking the wideband vary of 30 MHz–15 GHz. The general design, some technical particulars, the calibration methodology, and efficiency with some preliminary knowledge of those devices are offered.
Determine 1. The panorama view of Mingantu Observing Station with MUSER‐H/I/L. arrays, calibration antennas.
The photo voltaic radio imaging spectroscopic devices embrace a Meter–Decameter Wavelength Radioheliograph (30–400 MHz), the extension of MUSER to decrease frequency vary, a Round Array Photo voltaic Radio Telescope (150–450 MHz) at Daocheng in Sichuan province (DART, J. Yan et al., 2023), and incorporate MUSER (Y. Yan et al., 2021), a Centimeter‐Decimeter Wavelength Radioheliograph (400 MHz–15 GHz) with new calibration system. The photo voltaic radio spectrometers embrace a Metric Wavelength Photo voltaic Radio Spectrometer (90–600 MHz) at Chashan in Shandong province (Chang et al., 2024), Decameter‐Metric to Centimetric Wavelength Photo voltaic Radio Spectrometers (30–400 MHz, 400 MHz–2 GHz, 2–15 GHz) at MUSER web site, providing spectrum monitoring capacity throughout a brilliant extensive band from 30 MHz as much as 15 GHz. The tremendous‐positive spectral constructions of metric photo voltaic radio bursts are anticipated to be recorded. The information will probably be used to advance understanding of electron acceleration and emission mechanisms, and to enhance early warnings of CME shocks and photo voltaic energetic particles. Determine 1 exhibits a panorama view of MUSER arrays and calibration antennas, and so forth., within the Mingantu Observing Station.
Determine 2. A burst occasion on 6 January 2025. (a) The LASCO/SOHO picture at 05:06 UT. (b) The MUSER‐L multi‐frequencyimages in 30 MHz∼400 MHz at 05:07 UT. The inserted dynamic spectrum ranging from 05:06 UT displaying the enhancedsolar radio bursts.
With the newly established calibration programs for MUSER below CMP‐II and the brand new calibration methodology, additional progress on photo voltaic radio imaging spectroscopy has been made. Varied photo voltaic radio bursts have been recorded by MUSER‐L/‐I/‐H and Mingantu spectrometers. Knowledge are transmitted to the CMP knowledge heart each day. A photo voltaic radio burst occasion occurred on 6 January 2025 and noticed by MUSER‐L. The multi‐frequency pictures in 30 MHz – 400 MHz vary have been obtained and the radio supply at 30 MHz was so far as over 10 photo voltaic radius. The multi‐frequency pictures in 30 MHz – 400 MHz vary exhibit beam‐like cone construction with excessive frequency sources confined to the decrease altitude near the Solar, as proven in Determine 2. The alignment of those multi‐frequency radio sources at 05:07 UT agrees with the brilliant construction as proven by SOHO/LASCO C2 picture across the similar time interval 05:06 UT. This occasion demonstrates the capability to watch photo voltaic eruptions from the Solar into interplanetary area.
The Chashan Broadband Photo voltaic radio spectrometer with excessive temporal‐spectral resolutions (<1 ms, 100 kHz) at meter wavelengths masking 90–600 MHz has been developed (CBSm, Chang et al., 2024). The most important scientific objective of CBSm is to document superfine spectral constructions of metric photo voltaic radio bursts. See Determine 3 for examples of such spectral positive constructions recorded by CBSm. Since 10 November 2022, CBSm has detected many photo voltaic radio bursts, together with week‐lengthy Sort I bursts/noise storms, 50 Sort II bursts, a number of thousand Sort III bursts, and 20 Sort IV bursts.
Determine 3. High left panel is Chashan Photo voltaic Radio Spectrometer. (a) An instance of stripes with an total wavy morphology within the 8 Might 2024 occasion, with beaded construction rising within the center portion (tailored from C. Li et al., 2025). (b) Sort II bursts from 00:26:30 UT to 00:29:30 UT on 18 December 2023. (c) A kind II burst from 07:50:00 UT to 08:00:00 UT on 5 February 2025.(d) Sort III bursts from 23:29:00 UT to 23:30:00 UT on 18 March 2023. (e) Polarization diploma similar to (d).
The information offered on this paper can be found from the Nationwide House Science Knowledge Middle for the Chinese language Meridian Venture (https://knowledge.meridianproject.ac.cn). Some knowledge could also be topic to a proprietary interval; please consult with the info heart’s entry coverage. MUSER occasion knowledge could be visited at http://120.193.217.157:5404/solar_event_database/. Native MUSER‐L knowledge could be browsed at http://120.193.217.157:5403/muser/MUSER‐L/, and CBSm knowledge units could be accessed at http://47.104.87.104/SRData/CBSm/.
Conclusions
The services described right here supply uniquely broad frequency protection and superior imaging and spectral functionality. Their open knowledge coverage will allow collaborative analysis and improve international area climate monitoring and forecasting.
More information: The nugget relies on the not too long ago revealed paper by Yihua Yan et al., 2025, House Climate（open entry）, DOI:10.1029/2025SW004595
References
Chang, S., Wang, B., Lu, G., Shen, Y., Bai, Y., Shang, Z., et al. (2024). Growth of a 90–600 MHz meter‐wave photo voltaic radio spectrometer. The Astrophysical Journal ‐ Complement Collection, 272(1), 21. https://doi.org/10.3847/1538‐4365/ad3de7
Li, C., Chen, Y., Wang, B., Zhong, Z., Tan, B., Ning, Z., et al. (2025). A novel positive spectral construction of photo voltaic radio bursts with periodic beaded stripes noticed by CBSm of CMP‐II. Science China Physics, Mechanics & Astronomy, 68(10), 109611. https://doi.org/10.1007/s11433‐025‐2716‐4.
Yan, J., Wu, J., Wu, L., Yang, Y., Wu, J., Yan, Y., & Wang, C. (2023). A brilliant radio digicam with a one‐kilometre lens. Nature Astronomy, 7(6), 750. https://doi.org/10.1038/s41550‐023‐01932‐y
Yan, Y., Chen, Z., Wang, W., Liu, F., Geng, L., Chen, L., et al. (2021). Mingantu spectral radioheliograph for photo voltaic and area climate research. Frontiers in Astronomy and House Sciences, 8, 20. https://doi.org/10.3389/fspas.2021.584043
Wang, C., Xu, J., Chen, Z., Li, H., Feng, X., Huang, Z., & Wang, J. (2024). China’s floor‐primarily based area surroundings monitoring community—Chinese language meridian challenge (CMP). House Climate, 22(7), e2024SW003972. https://doi.org/10.1029/2024sw003972
