A simple and effective ratiometric fluorescence nanosensor for the selective detection of Cu2+ has been developed by covalently connecting carboxyl-modified red fluorescent cadmium telluride (CdTe) quantum dots (QDs) to amino-functionalized blue carbon nanodots (CDs). The sensor exhibits dual-emissions peaked at 437 654 nm, under a single excitation wavelength 340 nm. can be selectively quenched Cu2+, while is internal reference, resulting in distinguishable color change from pink UV lamp....

The so-called mini coronal mass ejections (CMEs) were recently identified as small-scale eruptive events showing the same on-disk characteristics large-scale CMEs, and Moore et al. further found that one-third of polar X-ray jets are blowout jets, in which jet-base magnetic arch, often carrying a filament, undergoes miniature version eruptions produce major CMEs. By means two viewpoint observations from Solar Dynamics Observatory (SDO) Ahead Terrestrial Relations (STEREO A), this Letter, we...

Abstract Similar to the cases of anemone jets, two-sided loop solar jets can also be produced by either flux emergence from interior or small-scale filament eruptions. Using high-quality data Solar Dynamics Observatory, we have analyzed a jet triggered eruption small filament. The occurred in pre-existing big channel. detailed processes involved filament, interaction between erupted and channel, launch are presented. observations further revealed notable asymmetry two branches spire:...

ABSTRACT Minifilament eruptions (MFEs) and coronal jets are different types of solar small-scale explosive events. We report an MFE observed at the New Vacuum Solar Telescope (NVST). As seen in NVST H α images, during rising phase, minifilament erupts outward orthogonally to its length, accompanied with a flare-like brightening bottom. Afterward, dark materials found possibly extend along axis expanded filament body. The is analogous large eruptions. However, simultaneous observation...

Coronal bright points (CBPs) are small-scale, long-lived coronal brightenings that always correspond to photospheric network magnetic features of opposite polarity. In this paper, we subjectively adopt 30 CBPs in a hole study their eruptive behavior using data from the Atmospheric Imaging Assembly (AIA) and Helioseismic Magnetic Imager (HMI) on board Solar Dynamics Observatory. About one-quarter one-third go through one or more minifilament eruption(s) (MFE(s)) throughout lifetimes. The MFEs...

Both large-amplitude longitudinal (LAL) oscillations and material drainage in a solar filament are associated with the flow of along axis, often followed by an eruption. However, relationship between these two motions subsequent eruption event is poorly understood. We analyze using EUV imaging data captured Atmospheric Imaging Array on board Solar Dynamics Observatory Hα images from Global Oscillation Network Group. Hours before eruption, was activated, one its legs undergoing slow rising...

It is well known that some coronal jets exhibit helical structures and untwisting. We attempt to inspect the origin of twist in a blowout jet. By means multi-wavelength multi-angle observations from Solar Dynamics Observatory (SDO) Terrestrial Relations Observatory-Ahead (STEREO-A), we firstly report polar untwisting jet which leads jet-like mass ejection. From viewpoint SDO, shows clear behavior two jet-spires. However, STEREO-A actually comes whiplike prominence eruption followed by...

On 2005 August 5, two solar filaments erupted successively from different confined arcades underlying a common overarching multiple-arcade bipolar helmet streamer. We present detailed observations of these events and identify them as sympathetic filament eruptions. The first (F1) is small active-region located near the outskirts streamer arcade. It underwent nonradial eruption, initially moving in interior arcade resulting an over-and-out coronal mass ejection. second (F2), larger quiescent...

ABSTRACT Taking advantage of the high spatiotemporal resolution observations from Atmospheric Imaging Assembly (AIA) and Helioseismic Magnetic Imager on board Solar Dynamics Observatory , we present rare rapid formation a filament caused by magnetic reconnection between two sets dark threadlike structures. The structures belong to distinct flux systems with their adjacent ends anchored in an opposite-polarity field region, where calculated photospheric velocity shows that converging flows...

Abstract We present an observation of the interaction between a filament and outer spine-like loops that produces blowout surge within one footpoint large-scale coronal on 2015 February 6. Based AIA 304 94 Å, activated is initially embedded below dome fan-spine configuration. Due to ascending motion, erupting reconnects with field. note material in blows out along field form wider spire, two-ribbon flare appears at site eruption. In this process, small bright blobs appear region stream up...

Abstract The abrupt motion of the photospheric flux during a solar flare is thought to be back reaction caused by coronal field reconfiguration. However, type pattern and physical mechanism responsible for has been uncertain. Here we show that direction sunspot’s rotation reversed an X1.6 using observations from Helioseismic Magnetic Imager. A magnetic extrapolation model shows corresponding shrinks with increasing twist density. This suggests reversal in sunspot may driven Lorentz torque...

Abstract Different from the classical emerging-flux model for solar jets, recent studies proposed that great majority of coronal jets are triggered by minifilament eruptions and two magnetic reconnection processes should take place during course, named as external (breakout reconnection) internal (flare reconnection). With excellent data Solar Dynamics Observatory, we present observational signatures these a jet occurred in huge hole northern hemisphere. The was eruption located at bright...

Taking advantage of the high temporal and spatial resolution Solar Dynamics Observatory (SDO) observations, we present four homologous extreme ultraviolet (EUV) waves within 3 hr on 2010 November 11. All EUV emanated from same emerging flux region (EFR), propagated in direction, were accompanied by surges, weak flares, faint coronal mass ejections (CMEs). The had basically appearance all wavebands Atmospheric Imaging Assembly SDO. at constant velocities range 280–500 km s−1, with little...

The rotation of eruptive filaments is not only related to the kink instability occurring in solar corona but also may result from interaction between large-scale magnetic field and eruptions themselves. This could likewise make filament deflect radial direction. By means data obtained by Atmospheric Imaging Assembly on board Solar Dynamics Observatory observations Terrestrial Relations Observatory, we study an showing both non-radial motion. consequence three-dimensional reconstruction axis...

Abstract Recent developments of the velocity gradient technique (VGT) show that gradients provide a reliable tracing magnetic field direction in turbulent plasmas. In this paper, we explore ability to measure magnetization interstellar medium. We demonstrate distribution orientations provides estimation media. particular, determine relation between Alfvénic Mach number M A range <?CDATA ${M}_{{\rm{A}}}\in [0.2,1.7]$?> and properties distribution, namely, with dispersion orientation as well...

Recent studies have revealed that solar jets involving minifilament eruptions may be initiated under the well-known magnetic-breakout mechanism. Before or just at onset of those jets, there should a current sheet, where breakout magnetic reconnection takes place, between open fields and outside jet-base arcade carrying in its core. In this paper we present jet produced by eruption two minifilaments lying base. A sheet is directly detected near base before eruption, suggesting However,...

We report four successive two-sided loop-type jets centered around a small bipole emerging below transequatorial interconnecting loops (TILs). They occurred at the very first stage of in short recurrent period only 12 minutes. During this term, flux consisted main bipole, but showed mixed-polarity field morphology with appearance and then disappearance magnetic feature its interior. However, no associated cancellation nearby was observed process. In multi-wavelength EUV images, started...

Abstract We present the detection of a small eruption and associated quasi-circular ribbon flare during emergence bipole occurring on 2015 February 3. Under fan dome, sigmoid was rooted in single magnetic bipole, which encircled by negative polarity. The nonlinear force-free field extrapolation shows presence twisted lines, can represent structure. rotation may cause twisting lines. An initial brightening appeared at one footpoints sigmoid, where positive polarity slides toward nearby...

Magnetohydrodynamic(MHD) turbulence displays velocity anisotropies which reflect the direction of magnetic field. This anisotropy has led to development a number statistical techniques for studying fields in interstellar medium. In this paper, we review and compare three that use radio position-position-velocity data determining field strength morphology : correlation function (CFA), Principal Component Analysis Anisotropies (PCAA), more recent Velocity Gradient Technique (VGT). We these...

Abstract We present the first observation of a solar filament formed by magnetic reconnection, associated chromospheric evaporation, and subsequent coronal condensation. Driven shearing motion during flux emergence, sequential tether-cutting reconnection process occurred resulted in an M1.3 confined flare accompanied formation sigmoid structure. It is found that had conjugate compact footpoint brightenings, which correspond to footpoints sigmoid. Furthermore, observational evidence explosive...

Over-and-out coronal mass ejections (CMEs) represent a broad class of CMEs that come from flare-producing magnetic explosions various sizes but are laterally far offset the flare, and their productions can be depicted by magnetic-arch-blowout scenario. In this paper, we present observations an over-and-out halo CME full eruption small kinking filament in emerging active region (AR). combination with results derived configuration, our showed was associated helmet streamer, located northern...

We present the first observation of formation and eruption a small circular filament driven by rotating network magnetic field (RNF) in quiet Sun. In negative footpoint region an inverse J-shaped dextral filament, RNF was formed convergence to supergranular junctions several flux patches same polarity, it then rotated counterclockwise (CCW) for approximately 11 hr showed up as CCW EUV cyclone, during which time gradually evolved into that surrounded cyclone. When calculated vortex flows...