[P-EM14] Frontiers in solar physics

[PEM14-08] Jet-like Solar Transients and ³He-rich Solar Energetic Particle Events Observed by Solar Orbiter

*Nariaki Nitta¹, Radoslav Bucik², Glenn Mason³, George Ho³, Christina Cohen⁴, Raul Gomez-Herrero⁵, Linghua Wang⁶, Laura Balmaceda^7,8 (1.Lockheed Martin Advanced Technology Center, 2.Southwest Research Institute, 3.Johns Hopkins Applied Physics Laboratory, 4.California Institute of Technology, 5.Universidad de Alcala, 6.Peking University, 7.George Mason University, 8.NASA Goddard Space Flight Center)

Keywords:Solar Energetic Particles, Coronal Jets, UV Radiation, Radio Emission, Ionic Composition

The origin of impulsive or ³He-rich solar energetic particle (SEP) events is still not well-understood, largely because their solar sources are elusive. Apart from their association with type III radio bursts and near-relativistic electron events, it has been advocated that coronal jets may be responsible for ³He-rich SEP events. We revisited the link of the two phenomena in ³He-rich SEP events well observed by Solar Orbiter in May 2021. The transient phenomena associated with ³He-rich SEP events did not necessarily look like a classic jet that consists of a footpoint brightening and a spire, but they belonged to jets in a broader definition. There were many more jets than the individual ion injections, and the question remained whether small jets not associated with type III bursts could also contribute to the enhancement of ³He. These frequent jets, revealed only in EUV images with high cadence, may explain long-lasting periods of ³He enhancement without clear injections. Here we extend the study to different periods, where ³He-rich SEP events were observed by Solar Orbiter closer to the Sun. We discuss further challenges in understanding the role of coronal jets in the production of ³He-rich SEP events.