标题： 帕克太阳探测器检测到与日面暗面活动区相关的太阳射电爆发 显示英文标题

标题： Parker Solar Probe detects solar radio bursts related with a behind-the-limb active region

摘要： 太阳射电爆发在帕克太阳探测器（PSP）相遇阶段的解释对于理解日冕中辐射机制的内在特性起着关键作用。 PSP接收器的时间-频率分辨率较低，可以通过使用更先进的天线和接收器进行同时的地基观测来克服。 在本文中，我们展示了这样的观测结果，其中活跃区域12765，即类型III、J和U太阳射电爆发的起源，在地基仪器的视野内，并且位于PSP航天器的日面边缘之后。 我们在2020年6月5日的太阳观测期间，使用了巨型乌克兰射电望远镜（GURT）的一个子阵列，以获得8-80 MHz频段的射电爆发的光谱特性，以及PSP射电仪器的带宽为10.5 kHz - 19.2 MHz。 由于PSP一侧没有活跃区域，我们利用太阳日冕中的特殊条件，直接检测到了由PSP航天器日面边缘后的活跃区域引发的射电事件。 根据太阳射电辐射的生成机制，我们对负责射电爆发的活跃区域12765上方的日冕密度模型进行了改进。 基于PSP航天器靠近太阳的位置以及空间和地基记录之间射电波的延迟，我们在PSP光谱图上找到了相应的射电响应。 PSP一侧没有黑子有助于射电波从太阳的高密度环状结构传播到低密度的安静区域，通过这些区域，PSP仪器可以检测到辐射。 显示英文摘要

摘要： The interpretation of solar radio bursts observed by Parker Solar Probe (PSP) in the encounter phase plays a key role in understanding intrinsic properties of the emission mechanism in the solar corona. Lower time-frequency resolution of the PSP receiver can be overcome by simultaneous ground-based observations using more advanced antennas and receivers. In this paper we present such observations for which the active active region 12765, begetter of type III, J, and U solar bursts, was within sight of ground-based instruments and behind the solar limb of the PSP spacecraft. We used a subarray of the Giant Ukrainian Radio Telescope (GURT) to get the spectral properties of radio bursts at the frequency range of 8-80 MHz, as well as the PSP radio instruments with a bandwidth of 10.5 kHz - 19.2 MHz, during solar observations on June 5, 2020. We directly detected the radio events initiated by the active region behind the solar limb of the PSP spacecraft, using special conditions in the solar corona, due to the absence of active regions from the PSP side. Following the generation mechanism of solar radio emission, we refined the density model for the solar corona above the active region 12765 responsible for the radio bursts. Based on the PSP spacecraft position near the Sun and delays of radio waves between space- and ground-based records, we found the corresponding radio responses on the PSP spectrogram. The absence of sunspots from the PSP side contributes to the propagation of radio waves from a dense loop of the Sun to quiet regions with low densities, through which PSP instruments can detect the radiation.