The Parker Solar Probe (PSP) spacecraft is measuring plasma properties of the solar wind to heliocentric distances as small as 0.125 au or 26.9 solar radii. One of the most important plasma parameters is the strength of the magnetic field. A variety of radioastronomical remote sensing measurements also provide information on the magnetic field, from the solar surface to heliocentric distances of about 10 solar radii. In this paper, we compare radioastronomical estimates from one technique, Faraday rotation of background radio sources, with the PSP measurements. The extrapolated radioastronomical values are in good agreement with the measurements at the first and second perihelion passages in 2018 and 2019. Future radio measurements could therefore complement PSP measurements as it approaches the ultimate perihelion of 9.8 solar radii.

中文翻译：

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日冕磁场和太阳风磁场的射电天文估计与Parker太阳探针测量的比较

帕克太阳探测器（PSP）航天器正在测量太阳风的等离子体特性，其日心距小至0.125 au或26.9太阳半径。等离子体的最重要参数之一就是磁场强度。各种各样的射电天文遥感测量结果还提供了有关磁场的信息，从太阳表面到大约10个太阳半径的日心距离。在本文中，我们将一项技术的法拉第旋转法拉第旋转技术与PSP测量结果相比较。外推的射电天文值与2018年和2019年第一和第二次近日通过的测量值非常吻合。因此，未来的无线电测量可能会接近PSP的测量值，因为它接近9.8太阳半径的最终近日。