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Authors: Schwadron N. A., Bale S., Bonnell J., Case A., Christian E. R., et al.
Title: Seed Population Preconditioning and Acceleration Observed by the Parker Solar Probe

A series of solar energetic particle (SEP) events was observed by the Integrated Science Investigation of the Sun (IS☉IS) on the Parker Solar Probe (PSP) during the period from 2019 April 18 through 24. The PSP spacecraft was located near 0.48 au from the Sun on Parker spiral field lines that projected out to 1 au within ̃25° of the near-Earth spacecraft. These SEP events, though small compared to historically large SEP events, were among the largest observed thus far in the PSP mission and provide critical information about the space environment inside 1 au during SEP events. During this period, the Sun released multiple coronal mass ejections (CMEs). One of these CMEs observed was initiated on 2019 April 20 at 01:25 UTC, and the interplanetary CME (ICME) propagated out and passed . . .
Date: 02/2020 Publisher: The Astrophysical Journal Supplement Series Pages: 33 DOI: 10.3847/1538-4365/ab5527 Available at:
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Authors: Pacheco D., Agueda N., Aran A., Heber B., and Lario D.
Title: Full inversion of solar relativistic electron events measured by the Helios spacecraft

Context. The Parker Solar Probe and the incoming Solar Orbiter mission will provide measurements of solar energetic particle (SEP) events at close heliocentric distances from the Sun. Up to present, the largest data set of SEP events in the inner heliosphere are the observations by the two Helios spacecraft.

Aims. We re-visit a sample of 15 solar relativistic electron events measured by the Helios mission with the goal of better characterising the injection histories of solar energetic particles and their interplanetary transport conditions at heliocentric distances <1 AU.

Methods. The measurements provided by the E6 instrument on board Helios provide us with the electron directional distributions in eight different sectors that we use t. . .
Date: 01/2019 Publisher: Astronomy & Astrophysics Pages: A3 DOI: 10.1051/0004-6361/201834520 Available at:
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