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Tracking a Beam of Electrons from the Low Solar Corona into Interplanetary Space with the Low Frequency Array, Parker Solar Probe, and 1 au Spacecraft

Bale Stuart D; Gallagher Peter T; Cañizares Luis Alberto; Oliveros Juan C Martínez; Dresing Nina; Pulupa Marc; Lario David; Jian Lan K; Badman Samuel T; Carley Eoin

Tracking a Beam of Electrons from the Low Solar Corona into Interplanetary Space with the Low Frequency Array, Parker Solar Probe, and 1 au Spacecraft

Bale Stuart D
Gallagher Peter T
Cañizares Luis Alberto
Oliveros Juan C Martínez
Dresing Nina
Pulupa Marc
Lario David
Jian Lan K
Badman Samuel T
Carley Eoin
Katso/Avaa
Badman_2022_ApJ_938_95.pdf (2.782Mb)
Lataukset: 

IOP Publishing Ltd
doi:10.3847/1538-4357/ac90c2
URI
https://iopscience.iop.org/article/10.3847/1538-4357/ac90c2
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2022112968042
Tiivistelmä
Type III radio bursts are the result of plasma emission from mildly relativistic electron beams propagating from the low solar corona into the heliosphere where they can eventually be detected in situ if they align with the location of a heliospheric spacecraft. Here we observe a type III radio burst from 0.1 to 16 MHz using the Parker Solar Probe (PSP) FIELDS Radio Frequency Spectrometer (RFS) and from 20 to 80 MHz using the Low Frequency Array (LOFAR). This event was not associated with any detectable flare activity but was part of an ongoing type III and noise storm that occurred during PSP encounter 2. A deprojection of the LOFAR radio sources into 3D space shows that the type III radio burst sources were located on open magnetic field from 1.6 to 3 R (circle dot) and originated from a near-equatorial active region around longitude E48 degrees. Combining PSP/RFS observations with WIND/WAVES and Solar Terrestrial Relations Observatory (STEREO) WAVES, we reconstruct the type III radio source trajectory in the heliosphere interior to PSP's position, assuming ecliptic confinement. An energetic electron enhancement is subsequently detected in situ at the STEREO A spacecraft at compatible times, although the onset and duration suggests the individual burst contributes a subset of the enhancement. This work shows relatively small-scale flux emergence in the corona can cause the injection of electron beams from the low corona into the heliosphere, without needing a strong solar flare. The complementary nature of combined ground and space-based radio observations, especially in the era of PSP, is also clearly highlighted by this study.
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