论文标题
首次使用新的太阳微波光谱仪在35-40 GHz的观察结果
The first flare observation with a new solar microwave spectrometer working in 35-40 GHz
论文作者
论文摘要
微波谱包含有关太阳耀斑的有价值信息。然而，目前的频谱覆盖范围远非完整，并且在20 GHz以上存在较大的数据差距。在这里，我们报告了第一次耀斑（2022年4月20日的X2.2耀斑）观察到新近建造的Chashan宽带太阳能毫米光谱仪（CBS），其工作量为35至40 GHz。我们使用新月的CBS数据进行校准，并在35 GHz处同时进行NORP数据进行盘问。冲动阶段具有三个局部峰，中间峰是最强的，最大磁通密度在35-40 GHz时达到9300 SFU。 CBS数据的光谱指数（Alpha_c）的主要峰值大多为正，表明陀螺仪转基因转离频率（NU_T）超过了35-40 GHz。根据具有NORP-CBS数据的光谱配件，在其他两个峰的大部分时间内，NU_T的频率较小，但仍大于20 GHz。 CBS指数表现出每个峰值和衰减阶段中逐渐变硬的一般快速增长的趋势，与NU_T <35 GHz的拟合光学光谱指数（ALPHA_TN）一致。此外，在整个冲动阶段获得的离职频率与相应的强度（I_T）息息相关，根据幂律依赖性（IT〜NU_T^4.8），相关系数为0.82。这与早期有关火炬的研究与较低的转换频率（<17 GHz）的早期研究相符，但对于较低的转换频率（<17 GHz），却是较高的频率（<17 GHz）的频率（<17 GHz），该研究的频率很高（> 20 GH）（> 20 GH）。> 20 ghz> 20 GHZ> 20 ghz> 20 ghz> 20 ghz。
The microwave spectrum contains valuable information about solar flares. Yet, the present spectral coverage is far from complete and broad data gaps exist above 20 GHz. Here we report the first flare (the X2.2 flare on 2022 April 20) observation of the newly-built Chashan Broadband Solar millimeter spectrometer (CBS) working from 35 to 40 GHz. We use the CBS data of the new Moon to calibrate,and the simultaneous NoRP data at 35 GHz to cross-calibrate. The impulsive stage has three local peaks with the middle one being the strongest and the maximum flux density reaches 9300 SFU at 35-40 GHz. The spectral index of the CBS data (alpha_C) for the major peak is mostly positive, indicating the gyrosynchrotron turnover frequency (nu_t) goes beyond 35-40 GHz. The frequency nu_t is smaller yet still larger than 20 GHz for most time of the other two peaks according to the spectral fittings with NoRP-CBS data. The CBS index manifests the general rapid-hardening-then-softening trend for each peak and gradual hardening during the decay stage, agreeing with the fitted optically-thin spectral index (alpha_tn) for nu_t < 35 GHz. In addition, the obtained turnover frequency during the whole impulsive stage correlates well with the corresponding intensity (I_t) according to a power-law dependence (It~nu_t^4.8) with a correlation coefficient of 0.82.This agrees with earlier studies on flares with low turnover frequency (<17 GHz), yet being reported for the first time for events with a high turnover frequency (>20 GHz).
