Search Publications
The 17 April 2021 widespread solar energetic particle event
Holmström, M.; Grande, M.; Palmerio, E. +46 more
Context. A complex and long-lasting solar eruption on 17 April 2021 produced a widespread solar energetic particle (SEP) event that was observed by five longitudinally well-separated observers in the inner heliosphere that covered distances to the Sun from 0.42 to 1 au: BepiColombo, Parker Solar Probe, Solar Orbiter, STEREO A, and near-Earth space…
First perihelion of EUI on the Solar Orbiter mission
Barczynski, K.; Peter, H.; Chitta, L. P. +35 more
Context. The Extreme Ultraviolet Imager (EUI) on board Solar Orbiter consists of three telescopes: the two High Resolution Imagers, in EUV (HRIEUV) and in Lyman-α (HRILya), and the Full Sun Imager (FSI). Solar Orbiter/EUI started its Nominal Mission Phase on 2021 November 27.
Aims: Our aim is to present the EUI images fr…
Traveling kink oscillations of coronal loops launched by a solar flare
Tian, Hui; Li, Dong; Ji, Kaifan +5 more
Context. Kink oscillations, which are often associated with magnetohydrodynamic waves, are usually identified as transverse displacement oscillations of loop-like structures. However, the traveling kink oscillation evolving to a standing wave has rarely been reported.
Aims: We investigate the traveling kink oscillation triggered by a solar fl…
Multiple injections of energetic electrons associated with the flare and CME event on 9 October 2021
Vainio, R.; Wiegelmann, T.; Krupar, V. +12 more
Context. We study the solar energetic particle (SEP) event observed on 9 October 2021 by multiple spacecraft, including Solar Orbiter. The event was associated with an M1.6 flare, a coronal mass ejection, and a shock wave. During the event, high-energy protons and electrons were recorded by multiple instruments located within a narrow longitudinal…
The data center for the Spectrometer and Telescope for Imaging X-rays (STIX) on board Solar Orbiter
Massa, Paolo; Krucker, Säm; Piana, Michele +12 more
Context. The Spectrometer and Telescope for Imaging X-rays (STIX) on board Solar Orbiter observes solar X-ray emission in the range of 4-150 keV and produces spectra and images of solar flares over a wide range of flare magnitudes. During nominal operation, STIX continuously generates data. A constant data flow requires fully automated data-proces…
First results from the Solar Orbiter Heavy Ion Sensor
Fedorov, A.; Livi, S.; Wurz, P. +30 more
Aims: Solar Orbiter launched in February 2020 with the goal of revealing the connections between the Sun's interior, atmosphere, and the heliosphere. The Solar Orbiter Heavy Ion Sensor (HIS) is a time-of-flight ion mass spectrometer dedicated to measuring heavy ions in the solar wind.
Methods: We present an overview of the first measurem…
Eruption and propagation of twisted flux ropes from the base of the solar corona to 1 au
Auchère, F.; Janvier, M.; Lugaz, N. +3 more
Context. Interplanetary coronal mass ejections (ICMEs) originate from the eruption of complex magnetic structures occurring in our star's atmosphere. Determining the general properties of ICMEs and the physical processes at the heart of their interactions with the solar wind is a hard task, in particular using only unidimensional in situ profiles.…
Extreme-ultraviolet fine structure and variability associated with coronal rain revealed by Solar Orbiter/EUI HRIEUV and SPICE
Barczynski, K.; Peter, H.; Chitta, L. P. +34 more
Context. Coronal rain is the most dramatic cooling phenomenon of the solar corona. Recent observations in the visible and UV spectrum have shown that coronal rain is a pervasive phenomenon in active regions. Its strong link with coronal heating through the thermal non-equilibrium (TNE) - thermal instability (TI) scenario makes it an essential diag…
Solar energetic electron events measured by MESSENGER and Solar Orbiter. Peak intensity and energy spectrum radial dependences: Statistical analysis
Lario, D.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +10 more
Context. We present a list of 61 solar energetic electron (SEE) events measured by the MESSENGER mission and the radial dependences of some parameters associated with these SEE events. The analysis covers the period from 2010 to 2015, when the heliocentric distance of MESSENGER varied between 0.31 and 0.47 au. We also show the radial dependences f…
Temperature of quiet Sun small scale brightenings observed by EUI on board Solar Orbiter: Evidence for a cooler component
Mierla, M.; Zhukov, A. N.; Berghmans, D. +16 more
Context. On May 30, 2020, small and short-lived extreme-UV (EUV) brightenings in the quiet Sun were observed over a four-minute sequence by the EUV channel of the Extreme Ultraviolet Imager - High Resolution Imager (EUIHRIEUV) on board the Solar Orbiter. The brightenings' physical origin and possible impact on coronal or transition regi…