Search Publications
Potential role of energetic particle observations in geomagnetic storm forecasting
Valtonen, Eino; Ameri, Dheyaa
We have searched for solar proton events consisting of both solar energetic particles (SEPs) accelerated near the Sun and energetic storm particles (ESPs) accelerated by interplanetary shocks driven by coronal mass ejections (CMEs) and observed near the time when the shock passes the observer. The purpose of this study is to investigate the possib…
Variation of coronal holes latitudinal distribution: Correction of limb brightening of EUV coronal images
Chargeishvili, B. B.; Maghradze, D. A.; Japaridze, D. R. +4 more
We studied the limb brightening of SOHO EIT daily images of the solar corona taken in 195 Å wavelength line from 1996 to 2018. Using special software, we studied the distribution of the background intensity of the entire disk in the direction of rotation (horizontally) and perpendicular to the direction of rotation (vertical). The study shows that…
A statistical study of CME-associated flare during the solar cycle 24
Beheary, M. M.; Shaltout, Abdelrazek M. K.; Amin, Eid A. +1 more
We investigate on the relationship between flares and coronal mass ejections (CMEs) in which a flare started before and after the CME events which differ in their physical properties, indicating potentially different initiation mechanisms. The physical properties of two types flare-correlated CME remain an interesting and important question in spa…
A study on radio-loud interacting/non-interacting CMEs-associated SEPs and solar flares
Feng, Li; Pappa Kalaivani, P.; Prakash, O. +4 more
We have established a data set of 58 major hybrid SEP events associated with meter-to-decahectometer wavelength (m-to-DH) type II bursts, solar flares, and radio-load CMEs during the period of 1997-2014. The main focus of our study is to address the following two questions: Does the interaction of CMEs play a role in the enhancement of SEP intensi…
Investigating the Coronal Mass Ejections associated with DH type-II radio bursts and solar flares during the ascending phase of the solar cycle 24
Nedal, Mohamed; Mahrous, Ayman; Youssef, M. +1 more
We studied a set of 74 CMEs, with shedding the light on the halo-CMEs (HCMEs), that are associated with decametric - hectometric (DH) type-II radio bursts (1-16 MHz) and solar flares during the period 2008-2014. The events were classified into 3 groups (disk, intermediate, and limb events) based on their longitudinal distribution.
We found th…Large-scale altitude distribution profile of auroral parallel electric potentials: A statistical analysis of Cluster data
Sadeghi, Soheil; Emami, M. Reza
It is generally believed that the heart of the Auroral Acceleration Region (AAR) is located between 5000 and 8000 km altitude above the auroral oval. Various altitude distribution profiles are suggested by different theories, including the transition layer model, which predicts that the strongest electric fields can be found at about 1 RE
Propagation of cosmic rays in heliosphere: The HELMOD model
Gervasi, M.; Rancoita, P. G.; Boschini, M. J. +2 more
The heliospheric modulation model HELMOD is a two dimensional treatment dealing with the helio-colatitude and radial distance from Sun and is employed to solve the transport-equation for the GCR propagation through the heliosphere down to Earth. This work presents the current version 3 of the HELMOD model and reviews how main processes involved in…
Geoeffectiveness of interplanetary shocks controlled by impact angles: A review
Samsonov, A. A.; Oliveira, D. M.
The high variability of the Sun's magnetic field is responsible for the generation of perturbations that propagate throughout the heliosphere. Such disturbances often drive interplanetary shocks in front of their leading regions. Strong shocks transfer momentum and energy into the solar wind ahead of them which in turn enhance the solar wind inter…
Small Bodies Near and Far (SBNAF): A benchmark study on physical and thermal properties of small bodies in the Solar System
Marton, G.; Müller, T. G.; Alí-Lagoa, V. +15 more
The combination of visible and thermal data from the ground and astrophysics space missions is key to improving the scientific understanding of near-Earth, main-belt, trojans, centaurs, and trans-Neptunian objects. To get full information on a small sample of selected bodies we combine different methods and techniques: lightcurve inversion, stella…
DePhine - The Deimos and Phobos Interior Explorer
Willner, Konrad; Oberst, Jürgen; Pätzold, Martin +15 more
DePhine - Deimos and Phobos Interior Explorer - is a mission proposed in the context of ESA's Cosmic Vision program, for launch in 2030. The mission will explore the origin and the evolution of the two Martian satellites, by focusing on their interior structures and diversity, by addressing the following open questions: Are Phobos and Deimos true …