Astronomy & Astrophysics (A&A)

Open Access

Solar coronal heating from small-scale magnetic braids

L. P. Chitta, H. Peter, S. Parenti, D. Berghmans, F. Auchère, S. K. Solanki, R. Aznar Cuadrado, U. Schühle, L. Teriaca, S. Mandal et al. (12 more)

Published online: 25 November 2022

DOI: https://doi.org/10.1051/0004-6361/202244170

Open Access

Connecting Solar Orbiter remote-sensing observations and Parker Solar Probe in situ measurements with a numerical MHD reconstruction of the Parker spiral

Ruggero Biondo, Alessandro Bemporad, Paolo Pagano, Daniele Telloni, Fabio Reale, Marco Romoli, Vincenzo Andretta, Ester Antonucci, Vania Da Deppo, Yara De Leo et al. (14 more)

Published online: 14 December 2022

DOI: https://doi.org/10.1051/0004-6361/202244535

Open Access

Evolution of coronal hole solar wind in the inner heliosphere: Combined observations by Solar Orbiter and Parker Solar Probe

D. Perrone, S. Perri, R. Bruno, D. Stansby, R. D’Amicis, V. K. Jagarlamudi, R. Laker, S. Toledo-Redondo, J. E. Stawarz, D. Telloni et al. (11 more)

Published online: 20 December 2022

DOI: https://doi.org/10.1051/0004-6361/202243989

Open Access

The 18–19 March 2022 series of ³He-rich events observed by Solar Orbiter at 0.36 au compared with EUV, X-ray, and radio observations

G. M. Mason, N. V. Nitta, R. Bučík, R. Gómez-Herrero, V. Krupar, S. Krucker, G. C. Ho, R. C. Allen, A. Kouloumvakos, R. F. Wimmer-Schweingruber et al. (3 more)

Published online: 18 January 2023

DOI: https://doi.org/10.1051/0004-6361/202245576

Open Access

The first gradual solar energetic particle event with an enhanced ³He abundance on Solar Orbiter

R. Bučík, G. M. Mason, R. Gómez-Herrero, V. Krupar, D. Lario, M. J. Starkey, G. C. Ho, J. Rodríguez-Pacheco, R. F. Wimmer-Schweingruber, F. Espinosa Lara et al. (9 more)

Published online: 21 December 2022

DOI: https://doi.org/10.1051/0004-6361/202245037

Open Access

Tracking magnetic flux and helicity from the Sun to Earth - Multi-spacecraft analysis of a magnetic cloud and its solar source

J. K. Thalmann, M. Dumbović, K. Dissauer, T. Podladchikova, G. Chikunova, M. Temmer, E. Dickson and A. M. Veronig

Published online: 11 January 2023

DOI: https://doi.org/10.1051/0004-6361/202244248

Open Access

Signatures of dynamic fibrils at the coronal base: Observations from Solar Orbiter/EUI

Sudip Mandal, Hardi Peter, Lakshmi Pradeep Chitta, Regina Aznar Cuadrado, Udo Schühle, Luca Teriaca, Sami K. Solanki, Louise Harra, David Berghmans, Frédéric Auchère et al. (13 more)

Published online: 27 January 2023

DOI: https://doi.org/10.1051/0004-6361/202245431

Open Access

First polar observations of the fast solar wind with the Metis – Solar Orbiter coronagraph: Role of 2D turbulence energy dissipation in the wind acceleration

D. Telloni, E. Antonucci, L. Adhikari, G. P. Zank, S. Giordano, M. Vai, L.-L. Zhao, V. Andretta, A. Burtovoi, G. E. Capuano et al. (26 more)

Published online: 14 February 2023

DOI: https://doi.org/10.1051/0004-6361/202245759

Open Access

Solar energetic electron events measured by MESSENGER and Solar Orbiter - Peak intensity and energy spectrum radial dependences: Statistical analysis

L. Rodríguez-García, R. Gómez-Herrero, N. Dresing, D. Lario, I. Zouganelis, L. A. Balmaceda, A. Kouloumvakos, A. Fedeli, F. Espinosa Lara, I. Cernuda et al. (3 more)

Published online: 02 February 2023

DOI: https://doi.org/10.1051/0004-6361/202244553

Open Access

Identifying the energy release site in a solar microflare with a jet

Andrea Francesco Battaglia, Wen Wang, Jonas Saqri, Tatiana Podladchikova, Astrid M. Veronig, Hannah Collier, Ewan C. M. Dickson, Olena Podladchikova, Christian Monstein, Alexander Warmuth et al. (3 more)

Published online: 02 February 2023

DOI: https://doi.org/10.1051/0004-6361/202244996

Open Access

Image enhancement with wavelet-optimized whitening

F. Auchère, E. Soubrié, G. Pelouze and É. Buchlin

Published online: 06 February 2023

DOI: https://doi.org/10.1051/0004-6361/202245345

Open Access

Modeling Solar Orbiter dust detection rates in the inner heliosphere as a Poisson process

S. Kočiščák, A. Kvammen, I. Mann, S. H. Sørbye, A. Theodorsen and A. Zaslavsky

Published online: 20 February 2023

DOI: https://doi.org/10.1051/0004-6361/202245165

Open Access

Temperature of quiet Sun small scale brightenings observed by EUI on board Solar Orbiter: Evidence for a cooler component

A. Dolliou, S. Parenti, F. Auchère, K. Bocchialini, G. Pelouze, P. Antolin, D. Berghmans, L. Harra, D. M. Long, U. Schühle et al. (9 more)

Published online: 06 March 2023

DOI: https://doi.org/10.1051/0004-6361/202244914

Open Access

Characterising fast-time variations in the hard X-ray time profiles of solar flares using Solar Orbiter’s STIX

Hannah Collier, Laura A. Hayes, Andrea F. Battaglia, Louise K. Harra and Säm Krucker

Published online: 08 March 2023

DOI: https://doi.org/10.1051/0004-6361/202245293

Open Access

The effect of variations in the magnetic field direction from turbulence on kinetic-scale instabilities

Simon Opie, Daniel Verscharen, Christopher H. K. Chen, Christopher J. Owen and Philip A. Isenberg

Published online: 31 March 2023

DOI: https://doi.org/10.1051/0004-6361/202345965

Open Access

In-flight validation of the Metis visible-light polarimeter coronagraph on board Solar Orbiter

A. Liberatore, S. Fineschi, M. Casti, G. Capobianco, L. Abbo, V. Andretta, V. Da Deppo, M. Fabi, F. Frassati, G. Jerse et al. (14 more)

Published online: 23 March 2023

DOI: https://doi.org/10.1051/0004-6361/202244069

Open Access

Multi-point study of the energy release and impulsive CME dynamics in an eruptive C7 flare

Jonas Saqri, Astrid M. Veronig, Ewan C. M. Dickson, Tatiana Podladchikova, Alexander Warmuth, Hualin Xiao, Dale E. Gary, Andrea Francesco Battaglia and Säm Krucker

Published online: 23 March 2023

DOI: https://doi.org/10.1051/0004-6361/202245079

Open Access

Recurrent ³He-rich solar energetic particle injections observed by Solar Orbiter at ∼0.5 au

R. Bučík, G. M. Mason, N. V. Nitta, V. Krupar, L. Rodriguez, G. C. Ho, S. T. Hart, M. A. Dayeh, J. Rodríguez-Pacheco, R. Gómez-Herrero and R. F. Wimmer-Schweingruber

Published online: 05 May 2023

DOI: https://doi.org/10.1051/0004-6361/202345875

Open Access

Quiet-time suprathermal ions in the inner heliosphere during the rising phase of solar cycle 25

G. M. Mason, G. C. Ho, R. C. Allen, A. Kouloumvakos, R. F. Wimmer-Schweingruber and J. Rodriguez-Pacheco

Published online: 18 May 2023

DOI: https://doi.org/10.1051/0004-6361/202345978

Open Access

Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI

J. Sinjan, D. Calchetti, J. Hirzberger, F. Kahil, G. Valori, S. K. Solanki, K. Albert, N. Albelo Jorge, A. Alvarez-Herrero, T. Appourchaux et al. (24 more)

Published online: 27 April 2023

DOI: https://doi.org/10.1051/0004-6361/202245830

Open Access

Acceleration of suprathermal protons near an interplanetary shock

L. Yang, V. Heidrich-Meisner, L. Berger, R. F. Wimmer-Schweingruber, L. Wang, J. He, X. Zhu, D. Duan, A. Kollhoff, D. Pacheco et al. (5 more)

Published online: 10 May 2023

DOI: https://doi.org/10.1051/0004-6361/202245681

Open Access

Slow solar wind sources - High-resolution observations with a quadrature view

Krzysztof Barczynski, Louise Harra, Conrad Schwanitz, Nils Janitzek, David Berghmans, Frédéric Auchère, Regina Aznar Cuadrado, Éric Buchlin, Emil Kraaikamp, David M. Long et al. (9 more)

Published online: 10 May 2023

DOI: https://doi.org/10.1051/0004-6361/202345983

Open Access

Imaging and spectroscopic observations of extreme-ultraviolet brightenings using EUI and SPICE on board Solar Orbiter

Ziwen Huang, L. Teriaca, R. Aznar Cuadrado, L. P. Chitta, S. Mandal, H. Peter, U. Schühle, S. K. Solanki, F. Auchère, D. Berghmans et al. (9 more)

Published online: 10 May 2023

DOI: https://doi.org/10.1051/0004-6361/202345988

Open Access

Evidence of external reconnection between an erupting mini-filament and ambient loops observed by Solar Orbiter/EUI

Z. F. Li, X. Cheng, M. D. Ding, L. P. Chitta, H. Peter, D. Berghmans, P. J. Smith, F. Auchère, S. Parenti, K. Barczynski et al. (9 more)

Published online: 10 May 2023

DOI: https://doi.org/10.1051/0004-6361/202245814

Open Access

The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations

J. Schou, J. Hirzberger, D. Orozco Suárez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodríguez, A. Gandorfer, D. Germerott et al. (37 more)

Published online: 10 May 2023

DOI: https://doi.org/10.1051/0004-6361/202345946

Open Access

The data center for the Spectrometer and Telescope for Imaging X-rays (STIX) on board Solar Orbiter

Hualin Xiao, Shane Maloney, Säm Krucker, Ewan Dickson, Paolo Massa, Erica Lastufka, Andrea Francesco Battaglia, László Etesi, Nicky Hochmuth, Frédéric Schuller et al. (5 more)

Published online: 18 May 2023

DOI: https://doi.org/10.1051/0004-6361/202346031

Open Access

Clustering of magnetic reconnection exhausts in the solar wind: An automated detection study

Naïs Fargette, Benoît Lavraud, Alexis P. Rouillard, Pierre S. Houdayer, Tai D. Phan, Marit Øieroset, Jonathan P. Eastwood, Georgios Nicolaou, Andrei Fedorov, Philippe Louarn et al. (2 more)

Published online: 08 June 2023

DOI: https://doi.org/10.1051/0004-6361/202346043

Open Access

The 17 April 2021 widespread solar energetic particle event

N. Dresing, L. Rodríguez-García, I. C. Jebaraj, A. Warmuth, S. Wallace, L. Balmaceda, T. Podladchikova, R. D. Strauss, A. Kouloumvakos, C. Palmroos et al. (39 more)

Published online: 09 June 2023

DOI: https://doi.org/10.1051/0004-6361/202345938

Open Access

Spectropolarimetric investigation of magnetohydrodynamic wave modes in the photosphere: First results from PHI on board Solar Orbiter

D. Calchetti, M. Stangalini, S. Jafarzadeh, G. Valori, K. Albert, N. Albelo Jorge, A. Alvarez-Herrero, T. Appourchaux, M. Balaguer Jiménez, L. R. Bellot Rubio et al. (24 more)

Published online: 09 June 2023

DOI: https://doi.org/10.1051/0004-6361/202245826

Open Access

Beyond the disk: EUV coronagraphic observations of the Extreme Ultraviolet Imager on board Solar Orbiter

F. Auchère, D. Berghmans, C. Dumesnil, J.-P. Halain, R. Mercier, P. Rochus, F. Delmotte, S. François, A. Hermans, V. Hervier et al. (31 more)

Published online: 13 June 2023

DOI: https://doi.org/10.1051/0004-6361/202346039

Open Access

Direct assessment of SDO/HMI helioseismology of active regions on the Sun’s far side using SO/PHI magnetograms

D. Yang, L. Gizon, H. Barucq, J. Hirzberger, D. Orozco Suárez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodríguez et al. (40 more)

Published online: 19 June 2023

DOI: https://doi.org/10.1051/0004-6361/202346030

Open Access

Small-scale EUV features as the drivers of coronal upflows in the quiet Sun

Conrad Schwanitz, Louise Harra, Cristina H. Mandrini, Alphonse C. Sterling, Nour E. Raouafi, Cecilia Mac Cormack, David Berghmans, Frédéric Auchère, Krzysztof Barczynski, Regina Aznar Cuadrado et al. (11 more)

Published online: 27 June 2023

DOI: https://doi.org/10.1051/0004-6361/202346036

Open Access

Langmuir waves associated with magnetic holes in the solar wind

J. J. Boldú, D. B. Graham, M. Morooka, M. André, Yu. V. Khotyaintsev, T. Karlsson, J. Souček, D. Píša and M. Maksimovic

Published online: 27 June 2023

DOI: https://doi.org/10.1051/0004-6361/202346100

Open Access

The source of unusual coronal upflows with photospheric abundance in a solar active region

L. K. Harra, C. H. Mandrini, D. H. Brooks, K. Barczynski, C. Mac Cormack, G. Cristiani, S. Mandal, A. C. Sterling, V. Martinez Pillet, N. Janitzek et al. (14 more)

Published online: 29 June 2023

DOI: https://doi.org/10.1051/0004-6361/202245747

Open Access

Multiple injections of energetic electrons associated with the flare and CME event on 9 October 2021

Immanuel C. Jebaraj, A. Kouloumvakos, N. Dresing, A. Warmuth, N. Wijsen, C. Palmroos, J. Gieseler, A. Marmyleva, R. Vainio, V. Krupar et al. (5 more)

Published online: 30 June 2023

DOI: https://doi.org/10.1051/0004-6361/202245716

Open Access

Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances

F. Kahil, A. Gandorfer, J. Hirzberger, D. Calchetti, J. Sinjan, G. Valori, S. K. Solanki, M. Van Noort, K. Albert, N. Albelo Jorge et al. (24 more)

Published online: 30 June 2023

DOI: https://doi.org/10.1051/0004-6361/202346033

Open Access

First perihelion of EUI on the Solar Orbiter mission

D. Berghmans, P. Antolin, F. Auchère, R. Aznar Cuadrado, K. Barczynski, L. P. Chitta, S. Gissot, L. Harra, Z. Huang, M. Janvier et al. (28 more)

Published online: 07 July 2023

DOI: https://doi.org/10.1051/0004-6361/202245586

Open Access

Magnetic reconnection as an erosion mechanism for magnetic switchbacks

G. H. H. Suen, C. J. Owen, D. Verscharen, T. S. Horbury, P. Louarn and R. De Marco

Published online: 12 July 2023

DOI: https://doi.org/10.1051/0004-6361/202345922

Open Access

Multi-spacecraft observations of near-relativistic electron events at different radial distances

A. Kollhoff, L. Berger, M. Brüdern, N. Dresing, S. Eldrum, S. Fleth, R. Gómez-Herrero, B. Heber, P. Kühl, D. Pacheco et al. (4 more)

Published online: 14 July 2023

DOI: https://doi.org/10.1051/0004-6361/202345955

Open Access

Recurrent solar density transients in the slow wind observed with the Metis coronagraph

R. Ventura, E. Antonucci, C. Downs, P. Romano, R. Susino, D. Spadaro, D. Telloni, S. L. Guglielmino, G. Capuano, V. Andretta et al. (15 more)

Published online: 20 July 2023

DOI: https://doi.org/10.1051/0004-6361/202346623

Open Access

First results from the Solar Orbiter Heavy Ion Sensor

S. Livi, S. T. Lepri, J. M. Raines, R. M. Dewey, A. B. Galvin, P. Louarn, M R. Collier, F. Allegrini, B. L. Alterman, C. M. Bert et al. (23 more)

Published online: 02 August 2023

DOI: https://doi.org/10.1051/0004-6361/202346304

Open Access

In-flight radiometric calibration of the Metis Visible Light channel using stars and comparison with STEREO-A/COR2 data

Y. De Leo, A. Burtovoi, L. Teriaca, M. Romoli, P. Chioetto, V. Andretta, M. Uslenghi, F. Landini, R. Susino, M. Pancrazzi et al. (38 more)

Published online: 07 August 2023

DOI: https://doi.org/10.1051/0004-6361/202345979

Open Access

A high-latitude coronal mass ejection observed by a constellation of coronagraphs: Solar Orbiter/Metis, STEREO-A/COR2, and SOHO/LASCO

G. Zimbardo, B. Ying, G. Nisticò, L. Feng, L. Rodríguez-García, O. Panasenco, V. Andretta, D. Banerjee, A. Bemporad, Y. De Leo et al. (28 more)

Published online: 07 August 2023

DOI: https://doi.org/10.1051/0004-6361/202346011

Open Access

Anisotropies of solar energetic electrons in the MeV range measured with Solar Orbiter/EPD/HET

S. Fleth, P. Kuehl, A. Kollhoff, R. F. Wimmer-Schweingruber, B. Heber, J. Rodríguez-Pacheco and N. Dresing

Published online: 07 August 2023

DOI: https://doi.org/10.1051/0004-6361/202345909

Open Access

Extreme-ultraviolet brightenings in the quiet Sun: Signatures in spectral and imaging data from the Interface Region Imaging Spectrograph

C. J. Nelson, F. Auchère, R. Aznar Cuadrado, K. Barczynski, E. Buchlin, L. Harra, D. M. Long, S. Parenti, H. Peter, U. Schühle et al. (6 more)

Published online: 08 August 2023

DOI: https://doi.org/10.1051/0004-6361/202346144

Open Access

Extreme-ultraviolet fine structure and variability associated with coronal rain revealed by Solar Orbiter/EUI HRI_EUV and SPICE

P. Antolin, A. Dolliou, F. Auchère, L. P. Chitta, S. Parenti, D. Berghmans, R. Aznar Cuadrado, K. Barczynski, S. Gissot, L. Harra et al. (27 more)

Published online: 17 August 2023

DOI: https://doi.org/10.1051/0004-6361/202346016

Open Access

Stereoscopic disambiguation of vector magnetograms: First applications to SO/PHI-HRT data

G. Valori, D. Calchetti, A. Moreno Vacas, É. Pariat, S. K. Solanki, P. Löschl, J. Hirzberger, S. Parenti, K. Albert, N. Albelo Jorge et al. (27 more)

Published online: 31 August 2023

DOI: https://doi.org/10.1051/0004-6361/202345859

Open Access

Particle monitoring capability of the Solar Orbiter Metis coronagraph through the increasing phase of solar cycle 25

C. Grimani, V. Andretta, E. Antonucci, P. Chioetto, V. Da Deppo, M. Fabi, S. Gissot, G. Jerse, M. Messerotti, G. Naletto et al. (19 more)

Published online: 31 August 2023

DOI: https://doi.org/10.1051/0004-6361/202346679

Open Access

A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion

M. Janvier, S. Mzerguat, P. R. Young, É. Buchlin, A. Manou, G. Pelouze, D. M. Long, L. Green, A. Warmuth, F. Schuller et al. (49 more)

Published online: 15 September 2023

DOI: https://doi.org/10.1051/0004-6361/202346321

SPICE point spread function correction: General framework and capability demonstration

J. Plowman, D.M. Hassler, F. Auchere, R. Aznar Cuadrado, A. Fludra, S. Mandal, H. Peter

Received: 29 November 2022 / Accepted: 30 April 2023

DOI: https://doi.org/10.1051/0004-6361/202245582

PDF (3.600 MB)

Reconstruction of total solar irradiance variability as simultaneously apparent from Solar Orbiter and Solar Dynamics Observatory

K.L. Yeo, N.A. Krivova, S.K. Solanki, J. Hirzberger, D. Orozco Suárez, K. Albert, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodríguez, A. Gandorfer, P. Gutierrez-Marques, F. Kahil, M. Kolleck, J.C. del Toro Iniesta, et al.

Received: 09 January 2023 / Accepted: 14 August 2023

DOI: https://doi.org/10.1051/0004-6361/202345872

PDF (1.826 MB)

Beyond small-scale transients: A closer look at the diffuse quiet solar corona

J. Gorman, L.P. Chitta, H. Peter, D. Berghmans, F. Auchère, R. Aznar Cuadrado, L. Teriaca, S.K. Solanki, C. Verbeeck, E. Kraaikamp, K. Stegen, S. Gissot

Received: 11 January 2023 / Accepted: 08 July 2023

DOI: https://doi.org/10.1051/0004-6361/202345892

PDF (2.484 MB)

Intensity contrast of solar network and faculae close to the solar limb, observed from two vantage points

K. Albert, N. A. Krivova, J. Hirzberger, S. K. Solanki, A. Moreno Vacas, D. Orozco Suárez, N. Albelo Jorge, T. Appourchaux, A. Alvarez-Herrero, J. Blanco Rodríguez, A. Gandorfer, P. Gutierrez-Marques, F. Kahil, M. Kolleck, et al.

Received: 31 January 2023 / Accepted: 03 September 2023

DOI: https://doi.org/10.1051/0004-6361/202346037

PDF (79.99 KB)

Coronal voids and their magnetic nature

J.D. Nölke, S.K. Solanki, J. Hirzberger, H. Peter, L.P. Chitta, et. al.

Received: 31 January 2023 / Accepted: 25 August 2023

DOI: https://doi.org/10.1051/0004-6361/202346040

PDF (15.61 MB)

Unusually long path length for a nearly scatter-free solar particle event observed by Solar Orbiter at 0.43 au

R. F. Wimmer-Schweingruber, L. Berger, A. Kollhoff, P. Kühl, B. Heber, et al.

Received: 04 March 2023 / Accepted: 21 August 2023

DOI: https://doi.org/10.1051/0004-6361/202346319

PDF (6.261 MB)

Astronomy & Astrophysics

Solar Orbiter First Results (Nominal Mission Phase)

SPICE point spread function correction: General framework and capability demonstration

Reconstruction of total solar irradiance variability as simultaneously apparent from Solar Orbiter and Solar Dynamics Observatory

Beyond small-scale transients: A closer look at the diffuse quiet solar corona

Intensity contrast of solar network and faculae close to the solar limb, observed from two vantage points

Coronal voids and their magnetic nature

Unusually long path length for a nearly scatter-free solar particle event observed by Solar Orbiter at 0.43 au