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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 Comparison of Total Electron Content Between Radio and Thompson Scattering
Llebaria, A.; Lamy, P.; Jensen, E. A. +5 more
The total electron content (TEC) of the solar corona in June 2002 is calculated by three observational techniques and the results are compared. The first technique is solar rotational tomography (SRT) applied to a 14-day time series of LASCO-C2 polarized brightness images, and the other two techniques use the Cassini spacecraft radio beacon for Do…
Forbush Decrease Prediction Based on Remote Solar Observations
Vršnak, B.; Dumbović, M.; Čalogović, J.
We employ remote observations of coronal mass ejections (CMEs) and the associated solar flares to forecast the CME-related Forbush decreases, i.e. short-term depressions in the galactic cosmic-ray flux. The relation between the Forbush effect at Earth and remote observations of CMEs and associated solar flares is studied via a statistical analysis…
First Simultaneous Views of the Axial and Lateral Perspectives of a Coronal Mass Ejection
Balmaceda, L.; Cremades, H.; Cabello, I. +1 more
The different appearances exhibited by coronal mass ejections (CMEs) are believed to be in part the result of different orientations of their main axis of symmetry, consistent with a flux-rope configuration. There are observational reports of CMEs seen along their main axis (axial perspective) and perpendicular to it (lateral perspective), but no …
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…
North/South Hemispheric Periodicities in the {>} 25 MeV Solar Proton Event Rate During the Rising and Peak Phases of Solar Cycle 24
Cane, H. V.; Richardson, I. G.; von Rosenvinge, T. T.
We present evidence that >25 MeV solar proton events show a clustering in time at intervals of about six months that persisted during the rising and peak phases of Solar Cycle 24. This phenomenon is most clearly demonstrated by considering events originating in the northern or southern solar hemispheres separately. We examine how these variatio…
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 …
Decay of Activity Complexes, Formation of Unipolar Magnetic Regions, and Coronal Holes in Their Causal Relation
Golubeva, E. M.; Mordvinov, A. V.
The peculiar development of solar activity in the current cycle resulted in an asynchronous reversal of the Sun's polar fields. The asymmetry is also observed in the formation of polar coronal holes. A stable coronal hole was first formed at the South Pole, despite the later polar-field reversal there. The aim of this study is to understand the pr…
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…