Search Publications
The Characteristics of Solar X-Class Flares and CMEs: A Paradigm for Stellar Superflares and Eruptions?
Toriumi, Shin; Guedel, Manuel; Harra, Louise K. +10 more
This paper explores the characteristics of 42 solar X-class flares that were observed between February 2011 and November 2014, with data from the Solar Dynamics Observatory (SDO) and other sources. This flare list includes nine X-class flares that had no associated CMEs. In particular our aim was to determine whether a clear signature could be ide…
A Comparison of Global Magnetic Field Skeletons and Active-Region Upflows
Culhane, J. L.; Brooks, D. H.; Harra, L. K. +2 more
Plasma upflows have been detected in active regions using Doppler velocity maps. The origin and nature of these upflows is not well known with many of their characteristics determined from the examination of single events. In particular, some studies suggest these upflows occur along open field lines and, hence, are linked to sources of the solar …
On the Relationship Between G-Band Bright Point Dynamics and Their Magnetic Field Strengths
Yang, Yunfei; Ji, Kaifan; Feng, Song +4 more
G-band bright points (GBPs) are regarded as good manifestations of magnetic flux concentrations. We aim to investigate the relation between the dynamic properties of GBPs and their longitudinal magnetic field strengths. High spatial and temporal resolution observations were recorded simultaneously with G-band filtergrams and Narrow-band Filter Ima…
Development of Active Regions: Flows, Magnetic-Field Patterns and Bordering Effect
Ishikawa, R.; Getling, A. V.; Buchnev, A. A.
A qualitative analysis is given of the data on the full magnetic and velocity vector fields in a growing sunspot group, recorded nearly simultaneously with the Solar Optical Telescope on the Hinode satellite. Observations of a young bipolar subregion developing within AR 11313 were carried out on 9 - 10 October 2011. Our aim was to form an idea ab…
Kinematics and Magnetic Properties of a Light Bridge in a Decaying Sunspot
Guglielmino, S. L.; Romano, P.; Borrero, J. M. +7 more
We present the results obtained by analysing high spatial and spectral resolution data of the solar photosphere acquired by the CRisp Imaging SpectroPolarimeter at the Swedish Solar Telescope on 6 August 2011 of a large sunspot with a light bridge (LB) observed in NOAA AR 11263. These data are complemented by simultaneous Hinode Spectropolarimeter…
The Hinode/XRT Full-Sun Image Corrections and the Improved Synoptic Composite Image Archive
Yoshimura, Keiji; Saar, Steven H.; Takeda, Aki
The XRT Synoptic Composite Image Archive (SCIA) is a storage and gallery of X-ray full-Sun images obtained through the synoptic program of the X-Ray Telescope (XRT) onboard the Hinode satellite. The archived images provide a quick history of solar activity through the daily and monthly layout pages and long-term data for morphological and quantita…
Spectroscopy at the Solar Limb: II. Are Spicules Heated to Coronal Temperatures?
Rezaei, R.; Puschmann, K. G.; Beck, C. +1 more
Spicules of the so-called type II were suggested to be relevant for coronal heating because of their ubiquity on the solar surface and their eventual extension into the corona. We investigate whether solar spicules are heated to transition-region or coronal temperatures and reach coronal heights (≫6 Mm) using multiwavelength observations of limb s…
Intensity Conserving Spectral Fitting
Klimchuk, J. A.; Patsourakos, S.; Tripathi, D.
The detailed shapes of spectral-line profiles provide valuable information about the emitting plasma, especially when the plasma contains an unresolved mixture of velocities, temperatures, and densities. As a result of finite spectral resolution, the intensity measured by a spectrometer is the average intensity across a wavelength bin of non-zero …
An Observational Study of the Recurring Formation and Dissipation of a Dynamic Filament
Wang, Jingxiu; Zhang, Jie; Zhou, Guiping
Based on observations at the Hα wavelength from the Hinode spacecraft, we report here the detailed process of a dynamical filament that showed repeated appearance and dissipation in a filament channel. First, Hα short fibrils spreading in the pre-formed filament channel joined into longer threads. The joining process was found to be accompanied by…
Evidence of Energy Supply by Active-Region Spicules to the Solar Atmosphere
Ahangarzadeh Maralani, A. R.; Tavabi, E.; Ajabshirizadeh, A. +1 more
We investigate the role of active-region spicules in the mass balance of the solar wind and energy supply in heating the solar atmosphere. We use high-cadence observations from the Solar Optical Telescope (SOT) onboard the Hinode satellite in the Ca II H-line filter obtained on 26 January 2007. The observational technique provides the high spatio-…