Search Publications
Improved modelling of SEP event onset within the WSA-Enlil-SEPMOD framework
Richardson, Ian G.; Auster, Hans-Ulrich; Palmerio, Erika +14 more
Multi-spacecraft observations of solar energetic particle (SEP) events not only enable a deeper understanding and development of particle acceleration and transport theories but also provide important constraints for model validation efforts. However, because of computational limitations, a given physics-based SEP model is usually best suited to c…
A catalogue of observed geo-effective CME/ICME characteristics
Foldes, Raffaello; Erdélyi, Robertus; Del Moro, Dario +7 more
One of the goals of Space Weather studies is to achieve a better understanding of impulsive phenomena, such as Coronal Mass Ejections (CMEs), to improve our ability to forecast their propagation characteristics and mitigate the risks to our technologically driven society. The essential part of achieving this goal is to assess the performance of fo…
Multi-instrument observations and tracking of a coronal mass ejection front from low to middle corona
Stepanyuk, Oleg; Kozarev, Kamen
The shape and dynamics of coronal mass ejections (CMEs) vary significantly based on the instrument and wavelength used. This has led to significant debate about the proper definitions of CME/shock fronts, pile-up/compression regions, and core observations in projection in optically thin vs. optically thick emission. Here we present an observationa…
The probabilistic solar particle event forecasting (PROSPER) model
Paassilta, Miikka; Raukunen, Osku; Vainio, Rami +6 more
The Probabilistic Solar Particle Event foRecasting (PROSPER) model predicts the probability of occurrence and the expected peak flux of solar energetic particle (SEP) events. Predictions are derived for a set of integral proton energies (i.e., E > 10, > 30, and > 100 MeV) from characteristics of solar flares (longitude, magnitude), corona…
What sustained multi-disciplinary research can achieve: The space weather modeling framework
Liemohn, Michael W.; van der Holst, Bart; Sokolov, Igor V. +15 more
Magnetohydrodynamics (MHD)-based global space weather models have mostly been developed and maintained at academic institutions. While the "free spirit" approach of academia enables the rapid emergence and testing of new ideas and methods, the lack of long-term stability and support makes this arrangement very challenging. This paper describes a s…
SunCET: The Sun Coronal Ejection Tracker Concept
Veronig, Astrid M.; Dissauer, Karin; Chamberlin, Phillip C. +16 more
The Sun Coronal Ejection Tracker (SunCET) is an extreme ultraviolet imager and spectrograph instrument concept for tracking coronal mass ejections through the region where they experience the majority of their acceleration: the difficult-to-observe middle corona. It contains a wide field of view (0-4 R⊙) imager and a 1 Å spectral-resolu…
Analysis of signal to noise ratio in coronagraph observations of coronal mass ejections
West, Matthew J.; Nicula, Bogdan; Bothmer, Volker +7 more
We establish a baseline signal-to-noise ratio (SNR) requirement for the European Space Agency (ESA)-funded Solar Coronagraph for OPErations (SCOPE) instrument in its field of view of 2.5-30 solar radii based on existing observations by the Solar and Heliospheric Observatory (SOHO). Using automatic detection of coronal mass ejections (CMEs), we ana…
Modelling solar irradiance from ground-based photometric observations
Chatzistergos, Theodosios; Ermolli, Ilaria; Giorgi, Fabrizio +2 more
Total solar irradiance (TSI) has been monitored from space since 1978, i.e. for about four solar cycles. The measurements show a prominent variability in phase with the solar cycle, as well as fluctuations on timescales shorter than a few days. However, the measurements were done by multiple and usually relatively short-lived missions. The differe…
Synoptic solar observations of the Solar Flare Telescope focusing on space weather
Sakurai, Takashi; Hanaoka, Yoichiro; Morita, Satoshi +2 more
The solar group at the National Astronomical Observatory of Japan is conducting synoptic solar observation with the Solar Flare Telescope. While it is a part of a long-term solar monitoring, contributing to the study of solar dynamo governing solar activity cycles, it is also an attempt at contributing to space weather research. The observations i…
The Electron Proton Helium INstrument as an example for a Space Weather Radiation Instrument
Heber, Bernd; Malandraki, Olga; Posner, Arik +3 more
The near-Earth energetic particle environment has been monitored since the 1970's. With the increasing importance of quantifying the radiation risk for, e.g. for the human exploration of the Moon and Mars, it is essential to continue and further improve these measurements. The Electron Proton Helium INstrument (EPHIN) on-board SOHO continually pro…