Stationary type IV solar radio bursts (IVSs) are broadband continuum emission observed at decimetric–decametric wavelength without apparent source motions. They are closely associated with solar flares and/or coronal mass ejections. Earlier studies on IVSs suffered from limited number of events, frequency coverage and available channels, and spatial resolution. Here we present an analysis on 34 IVSs using two-dimensional imaging data provided by Nançay Radioheliograh (NRH) at 10 frequencies from 150 to 445 MHz. The events are recorded from 2010 to 2014. We focus on general properties including the spatial dispersion of sources with frequency, brightness temperature (\(T_{\mathrm{B}}\)) and corresponding spectra, and polarization. Main findings are: (i) In the majority of events (23/34) regular and systematic source dispersion with frequency can be clearly recognized. (ii) In most (31/34) events the maximum brightness temperature (\(T^{\mathrm{E}}_{\mathrm{BM}}\)) exceeds \(10^{8}~\text{K}\), and exceeds \(10^{9}~\text{K}\) in 23 events. The histogram distribution of \(T^{f}_{\mathrm{BM}}\), i.e. the maximum brightness temperature of a source at certain frequency (\(f\)) of a specific event (referred to as event-\(f\) source, there are 247 such sources in total) exhibits a clear declining trend with increasing frequencies. The dominant type of \(T_{\mathrm{B}}\) spectra is power-law like with a negative index. (iii) In most events (30/34) the sense of polarization remains unchanged and the number of events with right and left-handed polarization are comparable. In 57% of all 247 event-\(f\) sources the level of polarization does not change considerably, in about 39% sources the level of polarization exhibits significant variation yet with a fixed sense, and in only 4% the sense of polarization changes. These results provide strong constraints on radiation mechanism of IVSs.

固定式IV型太阳无线电脉冲串（IVS）是在分米至分米波长下观察到的宽带连续辐射，没有明显的源运动。它们与太阳耀斑和/或日冕物质抛射密切相关。对IVS的早期研究受事件数量，频率覆盖范围和可用信道以及空间分辨率的限制。在这里，我们使用NançayRadioheliograh（NRH）在150至445 MHz的10个频率上提供的二维成像数据，对34种IVS进行了分析。这些事件记录了从2010年到2014年的事件。我们关注的一般属性包括频率，亮度温度（\（T _ {\ mathrm {B}} \）的光源的空间色散）和相应的光谱以及极化。主要发现是：（i）在大多数事件中（23/34），可以清楚地认识到定期和系统的源频散。（ii）在大多数（31/34）事件中，最大亮度温度（\（T ^ {\ mathrm {E}} _ {\ mathrm {BM}} \））超过\（10 ^ {8}〜\ text { K} \），并在23个事件中超过\（10 ^ {9}〜\ text {K} \）。\（T ^ {f} _ {\ mathrm {BM}} \）的直方图分布，即在特定事件（称为事件-的特定频率（\（f \））下，光源的最大亮度温度\（f \）来源，总共有247个此类来源）随着频率的增加呈现出明显的下降趋势。主导类型\（T _ {\ mathrm {B}} \）光谱像幂律一样，具有负折射率。（iii）在大多数事件中（30/34），极化感保持不变，具有右手和左手极化的事件数量是可比的。在所有247个事件源中，\（f \）的偏振水平没有显着变化，在大约39％的事件源中，偏振水平显示出很大的变化，但是具有固定的方向，只有4％的偏振方向变化。这些结果对IVSs的辐射机理提供了强有力的约束。