ABSTRACT The fundamental mechanism initiating coronal mass ejections (CMEs) remains controversial. One of the leading theories is magnetic breakout, in which reconnection occurring high corona removes confinement on an energized low-corona structure from overlying field, thus allowing it to erupt. Here, we report critical observational evidence this elusive breakout a multi-polar configuration that leads CME and X-class, long-duration flare. Its occurrence supported by presence pairs heated...

The battery performance and lifespan of electric vehicles (EVs) degrade significantly in cold climates, requiring a considerable amount energy to heat up the EV batteries. This paper proposes novel technology, namely temperature-controlled smart charging, coordinate heating/charging power reduce total use solar-powered charging station. Instead fixing temperature setpoints, we analyze thermal dynamics inertia batteries, decide optimal timing proper allocated for heating. In addition,...

We present the observation of a major solar eruption that is associated with fast sunspot rotation. The event includes sigmoidal filament eruption, coronal mass ejection, and GOES X2.1 flare from NOAA active region 11283. some overlying arcades were partially rooted in sunspot. rotated at ∼10° hr−1 during period 6 hr prior to eruption. In this period, was found rise gradually along Based on Helioseismic Magnetic Imager observation, for an area polarity inversion line underneath filament, we...

Abstract Quiescent solar prominences are generally considered to have a stable large-scale structure. However, they consist of multiple small-scale structures that often significantly dynamic. To understand the nature prominence plasma dynamics we use high spatial, temporal, and spectral resolution observations obtained by Interface Region Imaging Spectrograph ( IRIS ) during coordinated campaign with Multichannel Subtractive Double Pass spectrograph at Meudon Solar Tower. Detailed analysis...

Abstract The goal of this paper is to derive the physical conditions prominence observed on 2017 March 30. To do so, we use a unique set data in Mg ii lines obtained with space-borne Interface Region Imaging Spectrograph ( IRIS ) and H α line ground-based Multi-Channel Subtractive Double Pass spectrograph operating at Meudon solar tower. Here, analyze spectra h k lines, part which visible both sets lines. We compute grid 1D NLTE (i.e., departures from local thermodynamical equilibrium)...

Abstract We report on bidirectional coronal reconnection outflows reaching ±200 km s −1 as observed in an active region with the Si iv and C ii spectra of Interface Region Imaging Spectrograph ( IRIS ). The evolution emerging flux, a failed filament eruption, jet is followed Solar Dynamical Observatory SDO )/Atmospheric Assembly (AIA) filters from 304 to 94 Å, slit jaw images, /Helioseismic Magnetic Imager movies. outflow located at bright point visible multiwavelength AIA above arch system....

Abstract We continued our investigation of the plasma characteristics a quiescent prominence that occurred on 2017 March 30. The was observed simultaneously by several instruments, including Interface Region Imaging Spectrograph (IRIS) and Multichannel Subtractive Double Pass (MSDP) spectrograph operating at Meudon solar tower. focused IRIS Mg ii h&k MSDP H α spectra, selecting 55 well-coaligned points within prominence. computed an extensive grid 63,000 isothermal isobaric 1D-slab...

In this paper, we present a study of the persistent and gradual penumbral decay correlated decline photospheric transverse field component 10–20 hr before major flare (X1.8) eruption on 2011 September 7. This long-term pre-eruption behavior is corroborated by well-imaged pre-flare filament rising, consistent expansion coronal arcades overlying filament, nonlinear force-free modeling results in literature. We suggest that both are manifestations rise filament–flux rope system. also C3...

Context. The interaction between magnetic fields and convection in sunspots during their decay process remains poorly understood, whereas the formation of is relatively well studied fully modeled. Works on velocity scales at solar surface have pointed to existence family granules, whose with field leads supergranules networks, which are visible surface. Aims. aim this paper consider relationship via motion granules how diffusion mechanism operates a decaying sunspot. Methods. We report...

Abstract Multiwavelength observations of a prominence eruption provide an opportunity to uncover the physical mechanism triggering and evolution process eruption. In this paper, we investigate that erupted on 2012 October 14, recorded in H α , EUV, X-ray wavelengths. The gives evidence for existence helical magnetic structure showing twist converting writhe. estimated is <?CDATA $\sim 6\pi $?> (three turns), exceeding threshold kink instability. rising plasma reached high speed 228 km s −1...

Aims. Recurring jets are observed in the solar atmosphere. They can erupt intermittently over a long period of time. By observation intermittent jets, we wish to understand what causes characteristics periodic eruptions. Methods. We report by Goode Solar Telescope (GST) with TiO Broadband Filter Imager (BFI), Visible Imaging Spectrometer (VIS) H α , and Near-InfraRed Spectropolarimeter (NIRIS). The analysis was aided complemented 1400 Å 2796 data from Interface Region Spectrograph (IRIS)....

Aims. We aim to measure the metallicity distribution and velocity of red giant branch (RGB) stars along Sagittarius dwarf galaxy (Sgr) streams. Thanks large number Sloan Digital Sky Survey (SDSS) sample, we can study properties streams as a function Λ⊙ from Sgr core.

Magnetic helicity was found important in understanding solar activities such as flares and coronal mass ejections (CME). Berger field (1984) derived an expression for flux dH m /dt , that can be applied to individual active region (AR) occupying area S of the photosphere, (1) \begin{linenomath} dH_{m}/dt=-2\int_{s}[(\mathbf{A_{p}}\cdot \mathbf{V})\mathbf{B}-(\mathbf{A_{p}} \cdot \mathbf{B})\mathbf{V}] dS, \eqno{(1)} \end{linenomath} where A p is vector potential field, V plasma velocity at...

Aims. The aim of this paper is to consider relationship between the decay sunspots and convection via motion family granules how diffusion mechanism magnetic field operates in a decaying sunspot. Methods. We report sunspot observed by 1.6m Goode Solar Telescope (GST) with TiO Broadband Filter Imager (BFI) Near-InfraRed Imaging Spectropolarimeter (NIRIS). analysis was aided Helioseismic Magnetic (HMI) on board Dynamic Observatory (SDO). In first step, we followed HMI data over three days...

Context. Filament eruption is a common phenomenon in solar activity, but the triggering mechanism not well understood. Aims. We focus our study on filament located complex nest of three active regions close to coronal hole. Methods. The observed at multiple wavelengths: by Global Oscillation Network Group (GONG), Solar Terrestrial Relations Observatory (STEREO), Upper Transition Region Imager (SUTRI), and Atmospheric Imaging Assembly (AIA) Helioseismic Magnetic (HMI) board Dynamic (SDO)....

Filament eruption is a common phenomenon in solar activity, but the triggering mechanism not well understood. We focus our study on filament located complex nest of three active regions close to coronal hole. The observed at multiple wavelengths: by GONG, STEREO, SUTRI, and AIA Helioseismic Magnetic Imager (HMI) board SDO. Thanks high temporal-resolution observations, we were able analyze evolution fine structure detail. changes direction during eruption, which followed halo mass ejection...

Aims. On the Sun, jets in light bridges (LBs) are frequently observed with high-resolution instruments. The respective roles played by convection and magnetic field triggering such not yet clear. Methods. We report a small fan-shaped jet along LB 1.6m Goode Solar Telescope (GST) TiO Broadband Filter Imager (BFI), Visible Imaging Spectrometer (VIS) H α , Near-InfraRed Spectropolarimeter (NIRIS), Stokes parameters. high spatial temporal resolution of those instruments allowed us to analyze...

We select 947 star-forming galaxies from SDSS-DR7 with [O~{\sc iii}]$\lambda$4363 emission lines detected at a signal-to-noise {ratio }larger than 5$\sigma$. Their electron temperatures and direct oxygen abundances are {then }determined. {W}e compare the results different methods. $t_2${, the} temperature in {the }low ionization region{,} estimated $t_3${, that} }high {is} compared {using} three analysis relations between $t_2-t_3${. These} show obvious differences, which result some ionic...

Diagnosing the spatial-temporal pattern of magnetic flux on Sun is vital for understanding origin solar magnetism and activity. Here, we report a new form appearance, outbreak, using observations with an extremely high spatial resolution 0.16 arcsec from 1.6-m Goode Solar Telescope (GST) at Big Bear Observatory. Magnetic outbreak refers to early growth unipolar its later explosion into fragments, in association plasma upflow exploding granulations; each individual fragment has...