Search Publications
Extreme-UV quiet Sun brightenings observed by the Solar Orbiter/EUI
Haberreiter, M.; Mierla, M.; Zhukov, A. N. +25 more
Context. The heating of the solar corona by small heating events requires an increasing number of such events at progressively smaller scales, with the bulk of the heating occurring at scales that are currently unresolved.
Aims: The goal of this work is to study the smallest brightening events observed in the extreme-UV quiet Sun.
Method…
Transient small-scale brightenings in the quiet solar corona: A model for campfires observed with Solar Orbiter
Berghmans, D.; Auchère, F.; Chen, Yajie +3 more
Context. Recent observations by the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter have characterized prevalent small-scale transient brightenings in the corona above the quiet Sun termed campfires.
Aims: In this study we search for comparable brightenings in a numerical model and then investigate their relation to the magnetic field…
In situ multi-spacecraft and remote imaging observations of the first CME detected by Solar Orbiter and BepiColombo
Möstl, C.; Harrison, R. A.; Davies, J. A. +20 more
Context. On 2020 April 19 a coronal mass ejection (CME) was detected in situ by Solar Orbiter at a heliocentric distance of about 0.8 AU. The CME was later observed in situ on April 20 by the Wind and BepiColombo spacecraft whilst BepiColombo was located very close to Earth. This CME presents a good opportunity for a triple radial alignment study,…
Solar Orbiter: Mission and spacecraft design
Müller, D.; Zouganelis, I.; Cipriani, F. +37 more
The main scientific goal of Solar Orbiter is to address the central question of heliophysics: `how does the Sun create and control the heliosphere?' To achieve this goal, the spacecraft carries a unique combination of ten scientific instruments (six remote-sensing instruments and four in-situ instruments) towards the innermost regions of the Solar…
The first widespread solar energetic particle event observed by Solar Orbiter on 2020 November 29
Kulkarni, S. R.; Lario, D.; Laitinen, T. +66 more
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 by Solar Orbiter (SolO), Parker Solar Probe, the Solar Terrestrial Relations Ob…
First year of energetic particle measurements in the inner heliosphere with Solar Orbiter's Energetic Particle Detector
Kulkarni, S. R.; Lario, D.; Vainio, R. +45 more
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.
Aims: EPD measures suprathermal and energetic particles in the energy range from …
Density fluctuations associated with turbulence and waves. First observations by Solar Orbiter
Maksimovic, M.; Bale, S. D.; Chust, T. +21 more
Aims: The aim of this work is to demonstrate that the probe-to-spacecraft potential measured by RPW on Solar Orbiter can be used to derive the plasma (electron) density measurement, which exhibits both a high temporal resolution and a high level of accuracy. To investigate the physical nature of the solar wind turbulence and waves, we analyze…
First light observations of the solar wind in the outer corona with the Metis coronagraph
Heinzel, P.; Vial, J. -C.; Woch, J. +65 more
In this work, we present an investigation of the wind in the solar corona that has been initiated by observations of the resonantly scattered ultraviolet emission of the coronal plasma obtained with UVCS-SOHO, designed to measure the wind outflow speed by applying Doppler dimming diagnostics. Metis on Solar Orbiter complements the UVCS spectroscop…
Extreme-ultraviolet bursts and nanoflares in the quiet-Sun transition region and corona
Peter, H.; Chitta, L. P.; Young, P. R.
The quiet solar corona consists of myriads of loop-like features, with magnetic fields originating from network and internetwork regions on the solar surface. The continuous interaction between these different magnetic patches leads to transient brightenings or bursts that might contribute to the heating of the solar atmosphere. The literature on …
Stereoscopy of extreme UV quiet Sun brightenings observed by Solar Orbiter/EUI
Barczynski, K.; Haberreiter, M.; Mierla, M. +27 more
Context. The three-dimensional fine structure of the solar atmosphere is still not fully understood as most of the available observations are taken from a single vantage point.
Aims: The goal of the paper is to study the three-dimensional distribution of the small-scale brightening events ("campfires") discovered in the extreme-UV quiet Sun b…