Search Publications
Multi-Scale Variability of Coronal Loops Set by Thermal Non-Equilibrium and Instability as a Probe for Coronal Heating
Antolin, Patrick; Froment, Clara
Solar coronal loops are the building blocks of the solar corona. These dynamic structures are shaped by the magnetic field that expands into the solar atmosphere. They can be observed in X-ray and extreme ultraviolet (EUV), revealing the high plasma temperature of the corona. However, the dissipation of magnetic energy to heat the plasma to millio…
Single-spacecraft techniques for shock parameters estimation: A systematic approach
Vainio, R.; Horbury, T.; Dresing, N. +8 more
Spacecraft missions provide the unique opportunity to study the properties of collisionless shocks utilising in situ measurements. In the past years, several diagnostics have been developed to address key shock parameters using time series of magnetic field (and plasma) data collected by a single spacecraft crossing a shock front. A critical aspec…
Interrogating Solar Flare Loop Models with IRIS Observations 1: Overview of the Models, and Mass flows
Kerr, Graham S.
Solar and stellar flares are transient yet dramatic events in the atmospheres of the Sun or stars, during which vast amounts of magnetic energy is liberated. This energy is subsequently transported through the solar atmosphere or into the heliosphere, and together with coronal mass ejections flares comprise a fundamental component of space weather…
Recent progress with observations and models to characterize the magnetic fields from star-forming cores to protostellar disks
Hennebelle, Patrick; Maury, Anaëlle; Girart, Josep Miquel
In this review article, we aim at providing a global outlook on the progresses made in the recent years to characterize the role of magnetic fields during the embedded phases of the star formation process. Thanks to the development of observational capabilities and the parallel progress in numerical models, capturing most of the important physics …
The Planetary Theory of Solar Activity Variability: A Review
Scafetta, Nicola; Bianchini, Antonio
Commenting the 11-year sunspot cycle, Wolf (1859, MNRAS 19, 85–86) conjectured that "the variations of spot-frequency depend on the influences of Venus, Earth, Jupiter, and Saturn." The high synchronization of our planetary system is already nicely revealed by the fact that the ratios of the planetary orbital radii are closely related to each othe…
Interplanetary Ion Flux Dropouts Across Multiple 3He-Rich Events
Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Allen, R. C. +3 more
Solar Orbiter, a joint ESA/NASA mission, is studying the Sun and inner heliosphere in greater detail than ever before. Launched in February 2020, Solar Orbiter has already completed its first three orbits, reaching perihelia of 0.5 au from the Sun in June 2020, February and August 2021. During the first 2 years in orbit, Solar Orbiter observed mul…
Solar Jets: SDO and IRIS Observations in the Perspective of New MHD Simulations
Schmieder, Brigitte
Solar jets are observed as collimated plasma beams over a large range of temperatures and wavelengths. They have been observed in H α and optical lines for more than 50 years and called surges. The term "jet" comes from X-ray observations after the launch of the Yohkoh satellite in 1991. They are the means of transporting energy through the helios…
Near-Ultraviolet Continuum Modeling of the 1985 April 12 Great Flare of AD Leo
Kowalski, Adam F.
White-light stellar flares are now reported by the thousands in long-baseline, high-precision, broad-band photometry from missions like \emph{Kepler}, K2, and TESS. These observations are crucial inputs for assessments of biosignatures in exoplanetary atmospheres and surface ultraviolet radiation dosages for habitable zone planets around low-mass …
Asteroid Photometric Phase Functions From Bayesian Lightcurve Inversion
Muinonen, Karri; Cellino, Alberto; Wang, Xiaobin +3 more
Photometry is an important tool for characterizing the physical properties of asteroids. An asteroid's photometric lightcurve and phase curve refer to the variation of the asteroid's disk-integrated brightness in time and in phase angle (the Sun-asteroid-observer angle), respectively. They depend on the asteroid's shape, rotation, and surface scat…
Eruption and Interplanetary Evolution of a Stealthy Streamer-Blowout CME Observed by PSP at ∼0.5 AU
Lynch, Benjamin J.; Palmerio, Erika; Stevens, Michael L. +5 more
Streamer-blowout coronal mass ejections (SBO-CMEs) are the dominant CME population during solar minimum. Although they are typically slow and lack clear low-coronal signatures, they can cause geomagnetic storms. With the aid of extrapolated coronal fields and remote observations of the off-limb low corona, we study the initiation of an SBO-CME pre…