Search Publications
Observed IRIS Profiles of the h and k Doublet of Mg II and Comparison with Profiles from Quiescent Prominence NLTE Models
Heinzel, Petr; Kleint, Lucia; Vial, Jean-Claude +2 more
With the launch of the Interface Region Imaging Spectrograph (IRIS) mission, it is now possible to obtain high-resolution solar prominence spectra and to begin to distinguish the contributions of the many (apparent or not) threads that structure prominences. We aim at comparing unique observations obtained in the Mg II h and k lines of a polar cro…
The Effect of Limited Sample Sizes on the Accuracy of the Estimated Scaling Parameter for Power-Law-Distributed Solar Data
Poedts, Stefaan; Berghmans, David; Seaton, Daniel B. +1 more
Many natural processes exhibit a power-law behavior. The power-law exponent is linked to the underlying physical process, and therefore its precise value is of interest. With respect to the energy content of nanoflares, for example, a power-law exponent steeper than 2 is believed to be a necessary condition for solving the enigmatic coronal heatin…
Interplanetary Type IV Bursts
Hillaris, A.; Bouratzis, C.; Nindos, A.
We study the characteristics of moving type IV radio bursts that extend to hectometric wavelengths (interplanetary type IV or type IVIP bursts) and their relationship with energetic phenomena on the Sun. Our dataset comprises 48 interplanetary type IV bursts observed with the Radio and Plasma Wave Investigation (WAVES) instrument onboard Wind in t…
Active Region Emergence and Remote Flares
Welsch, Brian T.; Fu, Yixing
We study the effect of new emerging solar active regions on the large-scale magnetic environment of existing regions. We first present a theoretical approach to quantify the "interaction energy" between new and pre-existing regions as the difference between i) the summed magnetic energies of their individual potential fields and ii) the energy of …
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…
The Storm of Decameter Spikes During the Event of 14 June 2012
Rucker, H. O.; Poedts, S.; Zarka, P. +8 more
An event on 14 June 2012, observed with the radio telescopes UTR-2 (Kharkov, Ukraine), URAN-2 (Poltava, Ukraine), and NDA (Nançay, France) during a joint Summer campaign, is analyzed and discussed. The high solar activity resulted in a storm of spikes, and a storm of Type III bursts, Type IIIb bursts, and a Type IV burst observed in the decameter …
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 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…