B. Kliem
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View article: Magnetic Decay Index Profile and Coronal Mass Ejection Speed
Magnetic Decay Index Profile and Coronal Mass Ejection Speed Open
We study the relationship between the speed of coronal mass ejections (CMEs) and the height profile of the ambient magnetic field, quantified by its decay index, n(h). Our sample is composed of 15 very fast CMEs (Vcme > 1500 km/s; all halo…
View article: Coronal dimmings and what they tell us about solar and stellar coronal mass ejections
Coronal dimmings and what they tell us about solar and stellar coronal mass ejections Open
Coronal dimmings associated with coronal mass ejections (CMEs) from the Sun have gained much attention since the late 1990s when they were first observed in high-cadence imagery of the SOHO/EIT and Yohkoh/SXT instruments. They appear as lo…
View article: Coronal dimmings and what they tell us about solar and stellar coronal mass ejections
Coronal dimmings and what they tell us about solar and stellar coronal mass ejections Open
Coronal dimmings associated with coronal mass ejections (CME) from the Sun have gained much attention since the late 1990s when they were first observed in high-cadence imagery of the SOHO/EIT and Yohkoh/SXT instruments. They appear as loc…
View article: A Double-decker Flux Rope Model for the Solar Eruption on 2012 March 10
A Double-decker Flux Rope Model for the Solar Eruption on 2012 March 10 Open
We present a magnetic configuration of a compound solar eruption observed on 2012 March 10, from NOAA AR 11429 near the disk center, which displayed a soft X-ray sigmoid before the eruption. We constructed a series of magnetic field models…
View article: Multipoint study of the energy release and transport in the 28 March 2022, M4 flare using STIX, EUI, and AIA during the first Solar Orbiter nominal mission perihelion
Multipoint study of the energy release and transport in the 28 March 2022, M4 flare using STIX, EUI, and AIA during the first Solar Orbiter nominal mission perihelion Open
Context. The Spectrometer Telescope for Imaging X-rays (STIX) on board Solar Orbiter enables exciting multipoint studies of energy release and transport in solar flares by observing the Sun from many different distances and vantage points …
View article: Multi-point study of the energy release and transport in the 28 March 2022, M4-flare using STIX, EUI, and AIA during the first Solar Orbiter nominal mission perihelion
Multi-point study of the energy release and transport in the 28 March 2022, M4-flare using STIX, EUI, and AIA during the first Solar Orbiter nominal mission perihelion Open
We present a case study of an M4-class flare on 28 March 2022, near Solar Orbiter's first science perihelion (0.33 AU). Solar Orbiter was 83.5° west of the Sun-Earth line, making the event appear near the eastern limb, while Earth-orbiting…
View article: A Model for Confined Solar Eruptions Including External Reconnection
A Model for Confined Solar Eruptions Including External Reconnection Open
The violent disruption of the coronal magnetic field is often observed to be restricted to the low corona, appearing as a confined eruption. The possible causes of the confinement remain elusive. Here, we model the eruption of a magnetic f…
View article: A Model for Confined Solar Eruptions Including External Reconnection
A Model for Confined Solar Eruptions Including External Reconnection Open
The violent disruption of the coronal magnetic field is often observed to be restricted to the low corona, appearing as a confined eruption. The possible causes of the confinement remain elusive. Here, we model the eruption of a magnetic f…
View article: A Model of Homologous Confined and Ejective Eruptions Involving Kink Instability and Flux Cancellation
A Model of Homologous Confined and Ejective Eruptions Involving Kink Instability and Flux Cancellation Open
In this study, we model a sequence of a confined and a full eruption, employing the relaxed end state of the confined eruption of a kink-unstable flux rope as the initial condition for the ejective one. The full eruption, a model of a coro…
View article: Helicity shedding by flux rope ejection
Helicity shedding by flux rope ejection Open
Context. We quantitatively address the conjecture that magnetic helicity must be shed from the Sun by eruptions launching coronal mass ejections in order to limit its accumulation in each hemisphere. Aims. By varying the ratio of guide and…
View article: Partial Eruption, Confinement, and Twist Buildup and Release of a Double-decker Filament
Partial Eruption, Confinement, and Twist Buildup and Release of a Double-decker Filament Open
We investigate the failed partial eruption of a filament system in NOAA AR 12104 on 2014 July 5, using multiwavelength EUV, magnetogram, and H α observations, as well as magnetic field modeling. The filament system consists of two almost c…
View article: Partial Eruption, Confinement, and Twist Buildup and Release of a Double-decker Filament
Partial Eruption, Confinement, and Twist Buildup and Release of a Double-decker Filament Open
We investigate the failed partial eruption of a filament system in NOAA AR 12104 on 2014 July 5, using multiwavelength EUV, magnetogram, and H$α$ observations, as well as magnetic field modeling. The filament system consists of two almost …
View article: Initiation and early kinematic evolution of solar eruptions
Initiation and early kinematic evolution of solar eruptions Open
We investigate the initiation and early evolution of 12 solar eruptions, including six active-region hot channel and six quiescent filament eruptions, which were well observed by the Solar Dynamics Observatory, as well as by the Solar Terr…
View article: Multi-scale Observation and Data-driven Modeling of Magnetic Reconnection in Flaring Chromospheric Plasmas on the Sun
Multi-scale Observation and Data-driven Modeling of Magnetic Reconnection in Flaring Chromospheric Plasmas on the Sun Open
Magnetic reconnection is a multi-faceted process of energy conversion in astrophysical, space and laboratory plasmas that operates at microscopic scales but has macroscopic drivers and consequences. Solar flares present a key laboratory fo…
View article: The birth of a coronal mass ejection
The birth of a coronal mass ejection Open
Tiny plasmoids merge on the Sun and snowball into a stellar-sized eruption.
View article: Helicity transport in a simulated coronal mass ejection
Helicity transport in a simulated coronal mass ejection Open
It has been suggested that coronal mass ejections (CMEs) remove the magnetic he-licity of their coronal source region from the Sun. Such removal is often regarded to be necessary due to the hemispheric sign preference of the helicity, whic…
View article: Magnetic Structure of a Composite Solar Microwave Burst
Magnetic Structure of a Composite Solar Microwave Burst Open
A composite flare consisting of an impulsive flare SOL2015-06-21T01:42 ( GOES class M2.0) and a more gradual, long-duration flare SOL2015-06-21T02:36 (M2.6) from NOAA Active Region 12371, is studied using observations with the Nobeyama Rad…
View article: Unambiguous Evidence of Filament Splitting-Induced Partial Eruptions
Unambiguous Evidence of Filament Splitting-Induced Partial Eruptions Open
Coronal mass ejections are often considered to result from the full eruption of a magnetic flux rope (MFR). However, it is recognized that, in some events, the MFR may release only part of its flux, with the details of the implied splittin…
View article: Observing the release of twist by magnetic reconnection in a solar filament eruption
Observing the release of twist by magnetic reconnection in a solar filament eruption Open
Magnetic reconnection is a fundamental process of topology change and energy release, taking place in plasmas on the Sun, in space, in astrophysical objects and in the laboratory. However, observational evidence has been relatively rare an…
View article: STRUCTURE, STABILITY, AND EVOLUTION OF MAGNETIC FLUX ROPES FROM THE PERSPECTIVE OF MAGNETIC TWIST
STRUCTURE, STABILITY, AND EVOLUTION OF MAGNETIC FLUX ROPES FROM THE PERSPECTIVE OF MAGNETIC TWIST Open
We investigate the evolution of NOAA Active Region (AR) 11817 during 2013 August 10–12, when it developed a complex field configuration and produced four confined, followed by two eruptive, flares. These C-and-above flares are all associat…