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View article: Determining the Magnetic Field of Active Region Plages Using the Whole CLASP2/2.1 Spectral Window
Determining the Magnetic Field of Active Region Plages Using the Whole CLASP2/2.1 Spectral Window Open
The Chromospheric LAyer SpectroPolarimeter missions, CLASP2 and CLASP2.1, demonstrated that the near-UV spectral region between 279.30 and 280.68 nm is suitable for studying the magnetism of the solar chromosphere. In particular, the spect…
View article: Disambiguation of cool and hot emission in IRIS/Slit-Jaw Imager and AIA channels
Disambiguation of cool and hot emission in IRIS/Slit-Jaw Imager and AIA channels Open
Accurate temperature diagnostics of the solar corona are necessary for detecting the heating and cooling processes, and better understanding the conversion of the magnetic energy into thermal energy. A major obstacle in this enterprise is …
View article: Determining the Magnetic Field in the Atmosphere of a Solar Active Region Observed by the CLASP2.1 Sounding Rocket Experiment
Determining the Magnetic Field in the Atmosphere of a Solar Active Region Observed by the CLASP2.1 Sounding Rocket Experiment Open
We determine magnetic fields from the photosphere to the upper chromosphere combining data from the Hinode satellite and the CLASP2.1 sounding rocket experiment. CLASP2.1 provided polarization profiles of the Mg ii h and k lines, as well a…
View article: Determining the magnetic field of active region plages using the whole CLASP2/2.1 spectral window
Determining the magnetic field of active region plages using the whole CLASP2/2.1 spectral window Open
The Chromospheric LAyer SpectroPolarimeter missions, CLASP2 and CLASP2.1, demonstrated that the near-UV spectral region between 279.30 and 280.68 nm is suitable for studying the magnetism of the solar chromosphere. In particular, the spect…
View article: Active region upflows in various coronal structures and their coupling to the lower atmosphere
Active region upflows in various coronal structures and their coupling to the lower atmosphere Open
Context. Plasma upflows with a Doppler shift exceeding −10 km s −1 at active region (AR) boundaries are considered potential sources of the nascent slow solar wind. These upflows are often located at the footpoints of large-scale fan-like …
View article: Presenting 28 years of Sun-as-a-star extreme ultraviolet light curves from SOHO EIT
Presenting 28 years of Sun-as-a-star extreme ultraviolet light curves from SOHO EIT Open
Context. The Solar and Heliospheric Observatory (SOHO) Extreme-ultraviolet Imaging Telescope (EIT) has been taking images of the solar disk and corona in four narrow extreme ultraviolet (EUV) bandpasses (171 Å, 195 Å, 284 Å, and 304 Å) at …
View article: Probing Solar Polar Regions
Probing Solar Polar Regions Open
The magnetic fields and dynamical processes in the solar polar regions play a crucial role in the solar magnetic cycle and in supplying mass and energy to the fast solar wind, ultimately being vital in controlling solar activities and driv…
View article: Extreme-ultraviolet transient brightenings in the quiet-Sun corona
Extreme-ultraviolet transient brightenings in the quiet-Sun corona Open
Context. The extreme-ultraviolet (EUV) brightenings identified by Solar Orbiter, commonly known as campfires, are the smallest transient brightenings detected to date outside active regions in the solar corona. Aims. In order to understand…
View article: The Dynamics of the Extreme Ultraviolet Quiet Sun and Coronal Holes in the Solar Orbiter Era
The Dynamics of the Extreme Ultraviolet Quiet Sun and Coronal Holes in the Solar Orbiter Era Open
The quiet Sun corona and coronal holes, as seen in the extreme ultraviolet (EUV), host a variety of phenomena that operate over a range of spatial and temporal scales. Dynamic brightenings and jets of at most a few megameters appear to evo…
View article: In-flight cross-calibration of HRI<sub>EUV</sub>/EUI and AIA/SDO
In-flight cross-calibration of HRI<sub>EUV</sub>/EUI and AIA/SDO Open
Context . The extreme ultraviolet High-Resolution Imager (HRI EUV ) of the Extreme Ultraviolet Imager (EUI) telescope on board Solar Orbiter observes the solar corona in an ~5 Å wide passband near 174 Å with unprecedented high spatial reso…
View article: Upflows in a Decaying Active Region and its Potential Contribution to the Solar Wind&#160;
Upflows in a Decaying Active Region and its Potential Contribution to the Solar Wind  Open
Plasma upflows with a Doppler shift exceeding 20 km/s at active region (AR) boundaries are considered potential sources of nascent slow solar wind.  These upflows are often located at the footpoints of large-scale fan-like loops, show…
View article: Detection of a Magnetic Discontinuity in the Upper Solar Chromosphere Associated with a Coronal Loop Brightening Observed by CLASP2.1
Detection of a Magnetic Discontinuity in the Upper Solar Chromosphere Associated with a Coronal Loop Brightening Observed by CLASP2.1 Open
We report the first detection of a magnetic discontinuity in the upper solar chromosphere associated with a coronal loop brightening. Our findings are based on novel observations obtained by the Chromospheric LAyer SpectroPolarimeter (CLAS…
View article: Spatial distributions of extreme-ultraviolet brightenings in the quiet Sun
Spatial distributions of extreme-ultraviolet brightenings in the quiet Sun Open
Context. The identification of large numbers of localised transient extreme ultraviolet (EUV) brightenings, on very small spatial scales, in the quiet Sun corona has been one of the key early results from Solar Orbiter. However, there are …
View article: Spatial distributions of EUV brightenings in the quiet-Sun
Spatial distributions of EUV brightenings in the quiet-Sun Open
The identification of large numbers of localised transient EUV brightenings, with small spatial scales, in the quiet-Sun corona has been one of the key early results from Solar Orbiter. However, much is still unknown about these events. He…
View article: Mapping the Longitudinal Magnetic Field in the Atmosphere of an Active Region Plage from the Inversion of the Near-ultraviolet CLASP2.1 Spectropolarimetric Data
Mapping the Longitudinal Magnetic Field in the Atmosphere of an Active Region Plage from the Inversion of the Near-ultraviolet CLASP2.1 Spectropolarimetric Data Open
We apply the HanleRT Tenerife Inversion Code to the spectropolarimetric observations obtained by the Chromospheric Layer Spectropolarimeter. This suborbital space experiment measured the variation with wavelength of the four Stokes paramet…
View article: Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona
Metis Observation of the Onset of Fully Developed Turbulence in the Solar Corona Open
This Letter reports the first observation of the onset of fully developed turbulence in the solar corona. Long time series of white-light coronal images, acquired by Metis aboard Solar Orbiter at 2 minutes cadence and spanning about 10 hr,…
View article: Mapping the longitudinal magnetic field in the atmosphere of an active region plage from the inversion of the near-ultraviolet CLASP2.1 spectropolarimetric data
Mapping the longitudinal magnetic field in the atmosphere of an active region plage from the inversion of the near-ultraviolet CLASP2.1 spectropolarimetric data Open
We apply the HanleRT Tenerife Inversion Code to the spectro-polarimetric observations obtained by the Chromospheric LAyer SpectroPolarimeter. This suborbital space experiment measured the variation with wavelength of the four Stokes parame…
View article: Decomposing the AIA 304 Å Channel into Its Cool and Hot Components
Decomposing the AIA 304 Å Channel into Its Cool and Hot Components Open
The AIA 304 Å channel on board the Solar Dynamics Observatory (SDO) offers a unique view of $\approx 10^{5}\text{ K}$ plasma emitting in the He ii 304 Å line. However, when observing off-limb, the emission of the (small) cool struc…
View article: Spectral Imager of the Solar Atmosphere: The First Extreme-Ultraviolet Solar Integral Field Spectrograph Using Slicers
Spectral Imager of the Solar Atmosphere: The First Extreme-Ultraviolet Solar Integral Field Spectrograph Using Slicers Open
Particle acceleration, and the thermalisation of energetic particles, are fundamental processes across the universe. Whilst the Sun is an excellent object to study this phenomenon, since it is the most energetic particle accelerator in the…
View article: SPICE connection mosaics to link the Sun’s surface and the heliosphere
SPICE connection mosaics to link the Sun’s surface and the heliosphere Open
Aims. We present an analysis of the first connection mosaic made by the SPICE instrument on board the ESA/NASA Solar Orbiter mission on March 2, 2022. The data will be used to map coronal composition that will be compared with in-situ meas…
View article: Decomposing the AIA~304 channel into its cool and hot components
Decomposing the AIA~304 channel into its cool and hot components Open
The AIA~304 channel on board the \textit{Solar Dynamics Observatory} (SDO) offers a unique view of low transition region (TR) plasma emitting in the He II 304 ˚A line. However, when observing off-limb, the emission of the (small) cool stru…
View article: Investigating coronal loop morphology and dynamics from two vantage points
Investigating coronal loop morphology and dynamics from two vantage points Open
Coronal loops are the fundamental building blocks of the solar corona. Therefore, comprehending their properties is essential in unraveling the dynamics of the upper solar atmosphere. In this study, we conduct a comparative analysis of the…
View article: Investigating coronal loop morphology and dynamics from two vantage points
Investigating coronal loop morphology and dynamics from two vantage points Open
Coronal loops serve as the fundamental building blocks of the solar corona. Therefore, comprehending their properties is essential in unraveling the dynamics of the Sun's upper atmosphere. In this study, we conduct a comparative analysis o…
View article: The Solar Particle Acceleration Radiation and Kinetics (SPARK) Mission Concept
The Solar Particle Acceleration Radiation and Kinetics (SPARK) Mission Concept Open
Particle acceleration is a fundamental process arising in many astrophysical objects, including active galactic nuclei, black holes, neutron stars, gamma-ray bursts, accretion disks, solar and stellar coronae, and planetary magnetospheres.…
View article: SISA: The First Extreme-Ultraviolet Solar Integral Field
Spectrograph Using Slicers
SISA: The First Extreme-Ultraviolet Solar Integral Field
Spectrograph Using Slicers Open
Particle acceleration, and the thermalisation of energetic particles, are fundamental processes across the universe. Whilst the Sun is an excellent object to study this phenomenon, since it is the most energetic particle accelerator in the…
View article: Evolution of dynamic fibrils from the cooler chromosphere to the hotter corona
Evolution of dynamic fibrils from the cooler chromosphere to the hotter corona Open
Dynamic fibrils (DFs) are commonly observed chromospheric features in solar active regions. Recent observations from the Extreme Ultraviolet Imager (EUI) aboard the Solar Orbiter have revealed unambiguous signatures of DFs at the coronal b…
View article: Coronal voids and their magnetic nature
Coronal voids and their magnetic nature Open
Context. Extreme ultraviolet (EUV) observations of the quiet solar atmosphere reveal extended regions of weak emission compared to the ambient quiescent corona. The magnetic nature of these coronal features is not well understood. Aims. We…
View article: Coronal voids and their magnetic nature
Coronal voids and their magnetic nature Open
Extreme ultraviolet (EUV) observations of the quiet solar atmosphere reveal extended regions of weak emission compared to the ambient quiescent corona. The magnetic nature of these coronal features is not well understood. We study the magn…
View article: Evolution of dynamic fibrils from the cooler chromosphere to the hotter corona
Evolution of dynamic fibrils from the cooler chromosphere to the hotter corona Open
Dynamic fibrils (DFs) are commonly observed chromospheric features in solar active regions. Recent observations from the Extreme Ultraviolet Imager (EUI) aboard the Solar Orbiter have revealed unambiguous signatures of DFs at the coronal b…
View article: Beyond small-scale transients: A closer look at the diffuse quiet solar corona
Beyond small-scale transients: A closer look at the diffuse quiet solar corona Open
Aims. Within the quiet Sun corona imaged at 1 MK, much of the field of view consists of diffuse emission that appears to lack the spatial structuring that is so evident in coronal loops or bright points. Our aim is to determine if these di…