LOFAR observations of the solar corona during Parker Solar Probe perihelion passages

帕克太阳探测器近日点通过期间日冕的 LOFAR 观测

• 批准号: 426501369
• 负责人: Dr. Christian Vocks
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/426501369?language=en
• 关键词: LOFAR; observations; solar; corona; during

The LOw Frequency ARray (LOFAR) is a radio interferometer for the frequency range 10-240 MHz, that consists of a dense core and remote stations in the Netherlands, and international stations in various European countries. They form an interferometer with baselines up to 2000 km.NASA's Parker Solar Probe (PSP) spacecraft has approached the Sun up to 36 solar radii, or 0.166 AU, on its first perihelion passage on 5 November 2018. It is equipped with instruments to study the structure and dynamics of the solar wind plasma and magnetic field, the energy flow that heats the solar corona and drives the solar wind, and the mechanisms that accelerate energetic particles.LOFAR's capability of observing the solar corona and studying the heliosphere ideally complement PSP's in-situ and remote data. Simultaneous observations of the Sun and the inner heliosphere with LOFAR and PSP will enable studies of processes in the solar corona and near-Sun interplanetary space, monitoring both the formation of space-weather events and their subsequent propagation.The LOFAR Key Science Project (KSP) "Solar Physics and Space Weather with LOFAR", of which the applicants of this proposal are members, has been awarded a total of 1064 hours observing time during PSP perihelion passes over the next two years. These observations use LOFAR's simultaneously recorded interferometric data, dynamic radio spectra, interplanetary scintillation measurements, and pulsar observations for determining interplanetary magnetic fields.This proposal aims at evaluating these joint observations. The applicants' groups at UWM and AIP have long-standing experience in interferometric imaging of the solar corona and on the analysis of solar dynamic radio spectra, and focus on these parts of the LOFAR observations. The science cases include type II and III radio bursts, the quiet solar corona, and the plasma physics behind these observations. Combining such LOFAR observations with PSP data from near-Sun interplanetary space will provide information on, and constrain models of, solar wind and radio burst evolution from the corona into interplanetary space.This will result in a better understanding of the connection between the solarcorona and the heliosphere. This is a current science topic, and necessary for space weather studies, especially when it comes to predictions. The cooperation between the groups at UWM and AIP, funded through this proposal, would significantly support such scientific data analysis of the joint LOFAR – PSP observations. Both groups have experience in solar imaging and radio burst studies, and a closer collaboration between them will enable a better use of synergies between them. The implementation of the grant will support the creation of research groups at both institutions, dealing with the conduct and use of observations from LOFAR. Thanks to this, it will be possible to fully use the possibilities of this instrument and making it a unique research tool.

低频阵列（LOFAR）是频率范围为10-240 MHz的无线电干涉仪，由荷兰的密集核心站和远程站以及欧洲各国的国际站组成。2018年11月5日，美国宇航局的帕克太阳探测器（PSP）首次通过近日点，接近太阳36个太阳半径，即0.166 Au。它配备的仪器可用于研究太阳风等离子体和磁场的结构和动力学、加热日冕和驱动太阳风的能量流以及加速高能粒子的机制。LOFAR观测日冕和研究日光层的能力是PSP现场和远程数据的理想补充。利用LOFAR和PSP同时观测太阳和内日光层，将能够研究日冕和近太阳行星际空间的过程，监测空间天气事件的形成及其随后的传播。在未来两年内，天文台共获得1064小时的近日观测时间。这些观测使用LOFAR同时记录的干涉数据、动态射电谱、行星际闪烁测量和脉冲星观测，以确定行星际磁场。UWM和AIP的申请人小组在日冕干涉成像和太阳动态射电频谱分析方面具有长期经验，并侧重于LOFAR观测的这些部分。科学案例包括II型和III型射电暴，安静的日冕，以及这些观测背后的等离子体物理学。将这种LOFAR观测与来自近太阳行星际空间的PSP数据相结合，将提供关于太阳风和射电爆发从日冕到行星际空间演变的信息和约束模型，从而更好地了解日冕与日光层之间的联系。这是一个当前的科学主题，对于空间天气研究是必要的，特别是在预测方面。UWM和AIP的小组之间的合作，通过这一建议得到资助，将大大支持LOFAR-PSP联合观测的科学数据分析。这两个小组在太阳成像和无线电爆发研究方面都有经验，它们之间更密切的合作将能够更好地利用它们之间的协同作用。赠款的实施将支持在这两个机构建立研究小组，处理LOFAR观测的进行和使用。由于这一点，将有可能充分利用这一工具的可能性，使其成为一个独特的研究工具。