Mingantu Spectral Radioheliograph for Solar and Space Weather Studies

The Chinese Spectral Radioheliograph (CSRH) covering 400 MHz-15 GHz frequency range was constructed during 2009–2016 in Mingantu Observing Station, National Astronomical Observatories, Academy of Sciences at Zhengxiangbaiqi, Inner Mongolia China. CSRH is renamed as M ingant U S p E ctral R adioheliograph (MUSER) after its accomplishment. Currently, MUSER consists two arrays spreading over three spiral-shaped arms. maximum baseline length ∼3 km both east-west and north-south directions. array configuration optimized to meet the needs observing full-disk Sun ultrawide wavebands with images high temporal, spatial spectral resolutions dynamic range. low array, called MUSER-I, covers MHz-2.0 40 antennas 4.5-m-diameter each MUSER-II, 2–15 60 2-m-diameter each. MUSER-I can obtain solar radio 64 channels a time cadence 25 ms resolution 51.6″ 10.3″ (corresponding MHz 2 GHz), whereas MUSER-II 520 206.25 1.3 15 GHz). A dB be obtained snapshot produced MUSER. An extension further lower 30–400 an 224 logarithm-periodic dipole (LPDAs) has been approved will completed next 4 years. MUSER, dedicated instrument, following advantages providing simultaneous wide unique temporal-spatial-spectral resolutions; high-performing ultrawide-band dual-polarization feeds for wide-band signal collection; advanced data-rate, large-scale digital correlation receiver multiple-frequency faster observations; applications new technologies such using optical fiber remote antenna analog transmission. thus provides opportunity measure magnetic fields trace evolution energetic electrons several frequencies, which, turn, help have better understandings origin various activities basic drivers space weather.