Search Publications
Uncovering the process that transports magnetic helicity to coronal mass ejection flux ropes
Pal, Sanchita
Magnetic helicity, an intrinsic property of eruptive helical flux ropes (FRs) forming coronal mass ejections (CMEs), plays an important role in determining CME geoeffectiveness. In the solar atmosphere and heliosphere, helicity remains conserved in a closed volume. Considering this fact as a basis of our study, we perform a quantitative comparison…
Over-expansion of coronal mass ejections modelled using 3D MHD EUHFORIA simulations
Poedts, Stefaan; Scolini, Camilla; Schmieder, Brigitte +5 more
Coronal mass ejections (CMEs) are large scale eruptions observed close to the Sun. They are travelling through the heliosphere and possibly interacting with the Earth environment creating interruptions or even damaging new technology instruments. Most of the time their physical conditions (velocity, density, pressure) are only measured in situ at …
Investigation of the negative ionospheric response of the 8 September 2017 geomagnetic storm over the European sector
Oikonomou, Christina; Haralambous, Haris; Paul, Ashik +4 more
In this study, we investigate the negative ionospheric response over the European sector during two storms that took place on 8 September 2017, primarily, by exploiting observations over ten European locations. The spatial and temporal variations of TEC, foF2 and hmF2 ionospheric characteristics are examined with the aim to explain the physical me…
Solar and interplanetary events that drove two CIR-related geomagnetic storms of 1 June 2013 and 7 October 2015, and their ionospheric responses at the American and African equatorial ionization Anomaly regions
Akala, A. O.; Amaechi, P. O.; Simi, K. G. +3 more
This study investigates the sequence of solar and interplanetary events that drove the 1 June 2013 and October 2015 geomagnetic storms and how the American (68°-78oE) and African (32°-42oE) Equatorial Ionization Anomaly (EIA) regions responded to them. We constructed the EIA structures by using Total Electron Content (TEC) an…
Ionospheric total electron content anomaly possibly associated with the April 4, 2010 Mw7.2 Baja California earthquake
Zhou, Chen; Liu, Jing; Wang, Wenbin +2 more
Identifying ionospheric disturbances potentially related to an earthquake is a challenging work. Based on the ionospheric total electron content (TEC) data from the madrigal database at the Haystack Observatory, Massachusetts Institute of Technology, a new decomposition and nonlinear fitting method has been developed and applied in this work to ex…
Enthalpy-based modeling of tomographically reconstructed quiet-Sun coronal loops
Mandrini, C. H.; Vásquez, A. M.; Mac Cormack, C. +2 more
The structure of the solar corona is made of magnetic flux tubes or loops. Due to the lack of contrast with their environment, observing and studying coronal loops in the quiet Sun is extremely difficult. In this work we use a differential emission measure tomographic (DEMT) technique to reconstruct, from a series of EUV images covering an entire …
Detection of the third innermost radiation belt on LEO CORONAS-Photon satellite around 2009 solar minimum
Phillips, Kenneth J. H.; Sylwester, Janusz; Dudnik, Oleksiy V. +2 more
We analyze variations of high energy charged particle populations filling various magnetospheric regions under, inside and outside of the Van Allen inner and outer electron radiation belts in May 2009. The study is based on the experimental data obtained from the STEP-F and the SphinX instruments placed close to each other aboard the low-Earth cir…
A study of the characteristic properties of SEP events observed by SOHO ERNE during solar cycle 24
Biji, M. S.; Prince, P. R.
Properties and association of Solar Energetic Particle (SEP) events with their solar sources during the 24th solar cycle were examined. SEPs observed by SOHO ERNE were used. SEP properties include solar release time, peak proton flux and total fluence in different energy channels. Solar release times of SEP events were found out using Velocity Dis…