Search Publications
Propagation of Fast Coronal Mass Ejections and Shock Waves Associated with Type II Radio-Burst Emission: An Analytic Study
Aguilar-Rodriguez, E.; Corona-Romero, P.; Gonzalez-Esparza, J. A.
Coronal mass ejections (CMEs) are large-scale eruptive events in the solar corona. Once they are expelled into the interplanetary (IP) medium, they propagate outwards and "evolve" interacting with the solar wind. Fast CMEs associated with IP shocks are a critical subject for space weather investigations. We present an analytic model to study the h…
FISS Observations of Vertical Motion of Plasma in Tiny Pores
Cho, K. -S.; Kim, Y. -H.; Chae, J. +3 more
Pores can be exploited for the understanding of the interaction between small-scale vertical magnetic field and the surrounding convective motions as well as the transport of mechanical energy into the chromosphere along the magnetic field. For better understanding of the physics of pores, we investigate tiny pores in a new emerging active region …
Coronal Mass Ejections Associated with Slow Long Duration Flares
Kołomański, S.; Mrozek, T.; Bąk-Stęślicka, U.
It is well known that there is a temporal relationship between coronal mass ejections (CMEs) and associated flares. The duration of the acceleration phase is related to the duration of the rise phase of a flare. We investigate CMEs associated with slow long duration events (LDEs), i.e. flares with the long rising phase. We determined the relations…
2D and 3D Polar Plume Analysis from the Three Vantage Positions of STEREO/EUVI A, B, and SOHO/EIT
Feng, Li; Wiegelmann, Thomas; Inhester, Bernd +1 more
Polar plumes appear as elongated objects starting at the solar polar regions. Here we analyze these objects from a sequence of images taken simultaneously by the three spacecraft telescopes STEREO/EUVI A and B, and SOHO/EIT. We establish a method capable of automatically identifying plumes in solar EUV images close to the limb at 1.01 - 1.39 R
SoFAST: Automated Flare Detection with the PROBA2/SWAP EUV Imager
Berghmans, D.; Poedts, S.; De Groof, A. +2 more
The Sun Watcher with Active Pixels and Image Processing (SWAP) EUV imager onboard PROBA2 provides a non-stop stream of coronal extreme-ultraviolet (EUV) images at a cadence of typically 130 seconds. These images show the solar drivers of space-weather, such as flares and erupting filaments. We have developed a software tool that automatically proc…
Stereoscopic Analysis of the 31 August 2007 Prominence Eruption and Coronal Mass Ejection
Panasenco, O.; Hall, J. R.; Liewer, P. C.
The spectacular prominence eruption and CME of 31 August 2007 are analyzed stereoscopically using data from NASA's twin Solar Terrestrial Relations Observatory (STEREO) spacecraft. The technique of tie pointing and triangulation (T&T) is used to reconstruct the prominence (or filament when seen on the disk) before and during the eruption. For …
On-Orbit Sensitivity Evolution of the EUV Imaging Spectrometer on Hinode
Mariska, J. T.
Since its launch on 22 September 2006, the EUV Imaging Spectrometer onboard the Hinode satellite has exhibited a gradual decay in sensitivity. Using spectroheliograms taken in the Fe VIII 185.21 Å and Si VII 275.35 Å emission lines in quiet regions near Sun center we characterize that decay. For the period from December 2006 to March 2012, the dec…
A Statistical Study on CMEs Associated with DH-Type-II Radio Bursts Based on Their Source Location (Limb and Disk Events)
Umapathy, S.; Vasanth, V.
We have statistically studied the 344 Coronal Mass Ejections (CMEs) associated with flares and DH-type-II radio bursts (1 - 14 MHz) during 1997 - 2008. We found that only 3 % of the total CMEs (344) compared to the general population CMEs (13208) drives DH-type-II radio bursts (Gopalswamy in Solar Eruptions and Energetic Particles, AGU Geophys. Mo…
A Search for Helioseismic Signature of Emerging Active Regions
Kholikov, S.
Using SOHO/MDI and GONG observations we present time-distance deep-focusing measurements to examine the deeper layers of the solar convective zone. The constructed travel-time maps show 10 - 15 second perturbations at depths of 40 - 75 Mm around active region locations before their emergence to the solar surface. The majority of the active regions…
Temperature Response of the 171 Å Passband of the SWAP Imager on PROBA2, with a Comparison to TRACE, SOHO, STEREO, and SDO
Gallagher, Peter T.; Berghmans, David; Bloomfield, D. Shaun +3 more
We calculated the temperature response of the 171 Å passbands of the Sun Watcher using APS detectors and image Processing (SWAP) instrument onboard the PRoject for OnBoard Autonomy 2 (PROBA2) satellite. These results were compared to the temperature responses of the Extreme Ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Obs…