4.6 Article

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

Journal

ASTRONOMY & ASTROPHYSICS
Volume 657, Issue -, Pages -

Publisher

EDP SCIENCES S A
DOI: 10.1051/0004-6361/202141984

Keywords

Sun; activity; Sun; corona; Sun; radio radiation; methods; observational; space vehicles

Funding

  1. Polish National Agency for Academic Exchange [NAWA PPN/ULM/2019/1/00087/DEC/1]
  2. Czech Science Foundation [RVO:67985815, 20-09922J]
  3. National Academy of Sciences of Ukraine [0121U109536]
  4. NASA [NNN06AA01C]

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The interpretation of solar radio bursts observed by Parker Solar Probe during the encounter phase is important for understanding the emission mechanism in the solar corona. Ground-based observations with advanced antennas can help overcome the lower time-frequency resolution of the PSP receiver. In this study, observations were made of solar bursts generated by active region 12765, and radio events behind the solar limb of the PSP spacecraft were detected using special conditions in the solar corona.
Context. 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. Aims. In this paper we present such observations for which the active active region 12 765, 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. Methods. We used a subarray of the Giant Ukrainian Radio Telescope 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. Results. 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. Conclusions. 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.

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