Search Publications
Simultaneous Near-Sun Observations of a Moving Type IV Radio Burst and the Associated White-Light Coronal Mass Ejection
Ramesh, R.; Kathiravan, C.; Wang, T. J. +1 more
We present rare contemporaneous low-frequency (<100 MHz) imaging, spectral, and polarimetric observations of a moving type IV radio burst that had close spatio-temporal association with a white-light coronal mass ejection (CME) near the Sun. We estimate the electron density near the burst region from white-light coronagraph polarized brightness…
An Intense Flare-CME Event in 2015: Propagation and Interaction Effects Between the Sun and Earth's Orbit
Manoharan, P. K.; Johri, Abhishek
We report the interplanetary effects of a fast coronal mass ejection (CME) associated with the intense X2.7 flare that occurred on 05 May 2015. The near-Sun signatures of the CME at low-coronal heights [<2 R⊙] are obtained from the EUV images at 171 Å and metric radio observations. The intensity and duration of the CME-driven radio b…
Moreton and EUV Waves Associated with an X1.0 Flare and CME Ejection
Long, David M.; Mandrini, Cristina H.; Cremades, Hebe +3 more
A Moreton wave was detected in active region (AR) 12017 on 29 March 2014 with very high cadence with the H-Alpha Solar Telescope for Argentina (HASTA) in association with an X1.0 flare (SOL2014-03-29T17:48). Several other phenomena took place in connection with this event, such as low-coronal waves and a coronal mass ejection (CME). We analyze the…
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…