First report of a solar energetic particle event observed by China's Tianwen-1 mission in transit to Mars

TL;DR

This paper reports the first measurements of a solar energetic particle event by China's Tianwen-1 mission, revealing insights into particle acceleration, transport, and the reservoir effect during a CME-driven SEP event.

Contribution

It presents novel in-situ measurements of SEPs by Tianwen-1, providing new data on particle spectra, radial dependence, and the reservoir effect in near-Mars space.

Findings

Double-power-law spectra observed at multiple locations.

Radial dependence of SEP peak intensities confirmed.

Reservoir effect evident in decay phases of profiles.

Abstract

Solar energetic particles (SEPs) associated with flares and/or coronal mass ejection (CME)-driven shocks can impose acute radiation hazards to space explorations. To measure energetic particles in near-Mars space, the Mars Energetic Particle Analyzer (MEPA) instrument onboard China's Tianwen-1 (TW-1) mission was designed. Here, we report the first MEPA measurements of the widespread SEP event occurring on 29 November 2020 when TW-1 was in transit to Mars. This event occurred when TW-1 and Earth were magnetically well connected, known as the Hohmann-Parker effect, thus offering a rare opportunity to understand the underlying particle acceleration and transport process. Measurements from TW-1 and near-Earth spacecraft show similar double-power-law spectra and a radial dependence of the SEP peak intensities. Moreover, the decay phases of the time-intensity profiles at different locations clearly show the reservoir effect. We conclude that the double-power-law spectrum is likely generated at the acceleration site, and that a small but finite cross-field diffusion is crucial to understand the formation of the SEP reservoir phenomenon. These results provide insight into particle acceleration and transport associated with CME-driven shocks, which may contribute to the improvement of relevant physical models.