Search Publications
Solar Dynamics Observatory and Hinode Observations of a Blowout Jet in a Coronal Hole
Young, P. R.; Muglach, K.
A blowout jet occurred within the south coronal hole on 9 February 2011 at 09:00 UT and was observed by the Atmospheric Imaging Assembly (AIA) and Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory, and by the EUV Imaging Spectrometer (EIS) and X-Ray Telescope (XRT) onboard the Hinode spacecraft during coronal-hole monit…
Coronal Mass Ejections and Non-recurrent Forbush Decreases
Gopalswamy, N.; Mavromichalaki, H.; Papaioannou, A. +7 more
Coronal mass ejections (CMEs) and their interplanetary counterparts (interplanetary coronal mass ejections, ICMEs) are responsible for large solar energetic particle events and severe geomagnetic storms. They can modulate the intensity of Galactic cosmic rays, resulting in non-recurrent Forbush decreases (FDs). We investigate the connection betwee…
Comparative Study of MHD Modeling of the Background Solar Wind
Temmer, M.; Veronig, A. M.; Riley, P. +4 more
Knowledge about the background solar wind plays a crucial role in the framework of space-weather forecasting. In-situ measurements of the background solar wind are only available for a few points in the heliosphere where spacecraft are located, therefore we have to rely on heliospheric models to derive the distribution of solar-wind parameters in …
Coronal Magnetic Field Evolution from 1996 to 2012: Continuous Non-potential Simulations
Yeates, A. R.
Coupled flux transport and magneto-frictional simulations are extended to simulate the continuous magnetic-field evolution in the global solar corona for over 15 years, from the start of Solar Cycle 23 in 1996. By simplifying the dynamics, our model follows the build-up and transport of electric currents and free magnetic energy in the corona, off…
Abundance Enhancements in Impulsive Solar Energetic-Particle Events with Associated Coronal Mass Ejections
Reames, Donald V.; Kahler, Stephen W.; Cliver, Edward W.
We study the abundances of the elements He through Pb in Fe-rich impulsive solar energetic-particle (SEP) events with measurable abundances of ions with atomic number Z>2 observed on the Wind spacecraft, and their relationship with coronal mass ejections (CMEs) observed by the Large Angle and Spectrometric Coronagraph (LASCO) onboard the Solar …
Time-Dependent Modulation of Cosmic Rays in the Heliosphere
Ferreira, S. E. S.; Potgieter, M. S.; Manuel, R.
The time-dependent modulation of galactic cosmic rays in the heliosphere is studied by computing intensities using a time-dependent modulation model. By introducing recent theoretical advances in the transport coefficients in the model, computed intensities are compared with Voyager 1, International Monitoring Platform (IMP) 8, and Ulysses proton …
Solar Sources of Interplanetary Coronal Mass Ejections During the Solar Cycle 23/24 Minimum
Mierla, M.; Zhukov, A. N.; Rodriguez, L. +3 more
We examine solar sources for 20 interplanetary coronal mass ejections (ICMEs) observed in 2009 in the near-Earth solar wind. We performed a detailed analysis of coronagraph and extreme ultraviolet (EUV) observations from the Solar Terrestrial Relations Observatory (STEREO) and Solar and Heliospheric Observatory (SOHO). Our study shows that the cor…
Statistical Analysis of Large-Scale EUV Waves Observed by STEREO/EUVI
Temmer, M.; Veronig, A. M.; Vršnak, B. +3 more
We statistically analyzed the kinematical evolution and wave pulse characteristics of 60 strong large-scale EUV wave events that occurred during January 2007 to February 2011 with the STEREO twin spacecraft. For the start velocity, the arithmetic mean is 312±115 km s−1 (within a range of 100 - 630 km s−1). For the mean (linea…
Solar Energetic Particles and Associated EIT Disturbances in Solar Cycle 23
Temmer, M.; Veronig, A.; Klein, K. -L. +3 more
We explore the link between solar energetic particles (SEPs) observed at 1 AU and large-scale disturbances propagating in the solar corona, named after the Extreme ultraviolet Imaging Telescope (EIT) as EIT waves, which trace the lateral expansion of a coronal mass ejection (CME). A comprehensive search for SOHO/EIT waves was carried out for 179 S…
Are There Different Populations of Flux Ropes in the Solar Wind?
Démoulin, P.; Dasso, S.; Janvier, M.
Flux ropes are twisted magnetic structures that can be detected by in-situ measurements in the solar wind. However, different properties of detected flux ropes suggest different types of flux-rope populations. As such, are there different populations of flux ropes? The answer is positive and is the result of the analysis of four lists of flux rope…