César Martı́n

Comparative evaluation of self-attenuation corrections in uranium ore: intrinsic versus Eu-152 gamma-ray techniques

Ekrem Almaz, César Martı́n, Mohy Sabry, Sheldon Landsberger

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Radial evolution of the April 2020 stealth coronal mass ejection between 0.8 and 1 AU

J. L. Freiherr von Forstner, Mateja Dumbović, Christian Möstl, Jingnan Guo et autres

Aims. We present observations of the first coronal mass ejection (CME) observed by the Solar Orbiter spacecraft on April 19, 2020 and the associated Forbush decrease (FD) measured by the High Energy Telescope (HET). This CME is a multi-spacecraft event that was …

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Evidence for local particle acceleration in the first recurrent galactic cosmic ray depression observed by Solar Orbiter

Angels Aran, Daniel Pacheco, Monica Laurenza, Nicolas Wijsen et autres

Context.In mid-June 2020, the Solar Orbiter (SolO) mission reached its first perihelion at 0.51 au and started its cruise phase, with most of the in situ instruments operating continuously. Aims.We present the in situ particle measurements of the first proton event observed …

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First year of energetic particle measurements in the inner heliosphere with Solar Orbiter’s Energetic Particle Detector

Robert F. Wimmer-Schweingruber, N. P. Janitzek, Daniel Pacheco, Ignacio Cernuda et autres

Context. Solar Orbiter strives to unveil how the Sun controls and shapes the heliosphere and fills it with energetic particle radiation. To this end, its Energetic Particle Detector (EPD) has now been in operation, providing excellent data, for just over a year. …

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Solar energetic particle heavy ion properties in the widespread event of 2020 November 29

Glenn M. Mason, C. M. S. Cohen, George Cho-wah Ho, D. G. Mitchell et autres

Context.Following a multi-year minimum of solar activity, a solar energetic particle event on 2020 Nov. 29 was observed by multiple spacecraft covering a wide range of solar longitudes including ACE, the Solar Terrestrial Relations Observatory-A, and the recently launched Parker Solar Probe …

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In-flight verification of the engineering design data for the Energetic Particle Detector on board the ESA/NASA Solar Orbiter

Manuel Prieto, Alí Ravanbakhsh, O. Gutiérrez, Aaron Montalvo et autres

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The first widespread solar energetic particle event observed by Solar Orbiter on 2020 November 29

Alexander Kollhoff, Athanasios Kouloumvakos, David Lario, N. Dresing et autres

Context.On 2020 November 29, the first widespread solar energetic particle (SEP) event of solar cycle 25 was observed at four widely separated locations in the inner (≲1 AU) heliosphere. Relativistic electrons as well as protons with energies > 50 MeV were observed …

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The long period of3He-rich solar energetic particles measured by Solar Orbiter 2020 November 17–23

Radoslav Bučík, Glenn M. Mason, Raúl Gómez-Herrero, David Lario et autres

We report observations of a relatively long period of3He-rich solar energetic particles (SEPs) measured by Solar Orbiter. The period consists of several well-resolved ion injections. The high-resolution STEREO-A imaging observations reveal that the injections coincide with extreme ultraviolet jets and brightenings near …

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The long period of ³He-rich solar energetic particles measured by Solar Orbiter 2020 November 17–23

Radoslav Bučík, Glenn M. Mason, Raúl Gómez-Herrero, David Lario et autres

We report observations of a relatively long period of ³He-rich solar energetic particles (SEPs) measured by Solar Orbiter. The period consists of several well-resolved ion injections. The high-resolution STEREO-A imaging observations reveal that the injections coincide with extreme ultraviolet jets and brightenings …

Energetic ions in the Venusian system: Insights from the first Solar Orbiter flyby

Robert Colby Allen, Ignacio Cernuda, Daniel Pacheco, L. Berger et autres

The Solar Orbiter flyby of Venus on 27 December 2020 allowed for an opportunity to measure the suprathermal to energetic ions in the Venusian system over a large range of radial distances to better understand the acceleration processes within the system and …

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Quiet-time low energy ion spectra observed on Solar Orbiter during solar minimum

Glenn M. Mason, George Cho-wah Ho, Robert Colby Allen, Zigong Xu et autres

Context. The Solar Orbiter spacecraft cruised in the inner heliosphere during Feb. 2020 – Jan. 2021, moving between ∼0.5–1.0 au radial distance. The Energetic Particle Detector suite operated continuously during this period. Aims. The Suprathermal Ion Spectrograph and High Energy Telescope observations …

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The High Energy Telescope (HET) on the SolarOrbiter Mission: Overview and First Data

Zigong Xu, J. L. Freiherr von Forstner, Patrick Kühl, Nils P. Janitzek et autres

As part of the Energetic Particle Detector (EPD) suite onboard Solar Orbiter, the High Energy Telescope has been launched on its mission to the Sun on February 9, 2020, and has been measuring energetic particles since it was first switched on about …

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