Search Publications
Effective Acceleration Model for the Arrival Time of Interplanetary Shocks driven by Coronal Mass Ejections
Paouris, Evangelos; Mavromichalaki, Helen
In a previous work (Paouris and Mavromichalaki in Solar Phys. 292, 30, 2017), we presented a total of 266 interplanetary coronal mass ejections (ICMEs) with as much information as possible. We developed a new empirical model for estimating the acceleration of these events in the interplanetary medium from this analysis. In this work, we present a …
On the Collision Nature of Two Coronal Mass Ejections: A Review
Wang, Yuming; Shen, Fang; Shen, Chenglong +1 more
Observational and numerical studies have shown that the kinematic characteristics of two or more coronal mass ejections (CMEs) may change significantly after a CME collision. The collision of CMEs can have a different nature, i.e. inelastic, elastic, and superelastic processes, depending on their initial kinematic characteristics. In this article,…
Two-Step Filament Eruption During 14 - 15 March 2015
Filippov, B.; Schmieder, B.; Chandra, R. +1 more
We present here an interesting two-step filament eruption during 14 - 15 March 2015. The filament was located in NOAA AR 12297 and associated with a halo Coronal Mass Ejection (CME). We use observations from the Atmospheric Imaging Assembly (AIA) and Heliospheric Magnetic Imager (HMI) instruments onboard the Solar Dynamics Observatory (SDO), and f…
Solar Energetic Particle Events with Protons Above 500 MeV Between 1995 and 2015 Measured with SOHO/EPHIN
Dresing, N.; Heber, B.; Kühl, P. +1 more
The Sun is an effective particle accelerator that produces solar energetic particle (SEP) events, during which particles of up to several GeVs can be observed. These events, when they are observed at Earth with the neutron monitor network, are called ground-level enhancements (GLEs). Although these events with their high-energy component have been…
Origin and Ion Charge State Evolution of Solar Wind Transients during 4 - 7 August 2011
Slemzin, V.; Goryaev, F.; Pagano, P. +5 more
We present a study of the complex event consisting of several solar wind transients detected by the Advanced Composition Explorer (ACE) on 4 - 7 August 2011, which caused a geomagnetic storm with Dst =−110 nT. The supposed coronal sources, three flares and coronal mass ejections (CMEs), occurred on 2 - 4 August 2011 in active region (AR) 11261. To…
A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves
Long, D. M.; Carley, E. P.; Pérez-Suárez, D. +2 more
Solar eruptions are the most spectacular events in our solar system and are associated with many different signatures of energy release including solar flares, coronal mass ejections, global waves, radio emission and accelerated particles. Here, we apply the Coronal Pulse Identification and Tracking Algorithm (CorPITA) to the high-cadence synoptic…
A Relationship Between the Solar Rotation and Activity Analysed by Tracing Sunspot Groups
Ruždjak, Domagoj; Brajša, Roman; Skokić, Ivica +2 more
The sunspot position published in the data bases of the Greenwich Photoheliographic Results (GPR), the US Air Force Solar Optical Observing Network and National Oceanic and Atmospheric Administration (USAF/NOAA), and of the Debrecen Photoheliographic Data (DPD) in the period 1874 to 2016 were used to calculate yearly values of the solar differenti…
Understanding Problem Forecasts of ISEST Campaign Flare-CME Events
Nitta, Nariaki; Webb, David
The goal of the International Study of Earth-affecting Solar Transients (ISEST) project as part of the Variability of the Sun and Its Terrestrial Impact (VarSITI) program is to understand the origin, evolution, and propagation of solar transients through the space between the Sun and Earth, and to improve our prediction capability for space weathe…
A Helioseismic Perspective on the Depth of the Minimum Between Solar Cycles 23 and 24
Broomhall, A. -M.
The minimum in the solar-activity cycle observed between Cycles 23 and 24 is generally regarded as being unusually deep and long. This minimum is being followed by a cycle with one of the smallest amplitudes in recent history. We perform an in-depth analysis of this minimum with helioseismology. We use Global Oscillation Network Group (GONG) data …
Observations and Modelling of the Pre-flare Period of the 29 March 2014 X1 Flare
Long, D. M.; Harra, L. K.; Matthews, S. A. +3 more
On 29 March 2014, NOAA Active Region (AR) 12017 produced an X1 flare that was simultaneously observed by an unprecedented number of observatories. We have investigated the pre-flare period of this flare from 14:00 UT until 19:00 UT using joint observations made by the Interface Region Imaging Spectrometer (IRIS) and the Hinode Extreme Ultraviolet …