Review of solar energetic particle models

Solar Energetic Particle (SEP) events are interesting from a scientific perspective as they are the product of a broad set of physical processes from the corona out through the extent of the heliosphere, and provide insight into processes of particle acceleration and transport that are widely applicable in astrophysics. From the operations perspective, SEP events pose a radiation hazard for aviation, electronics in space, and human space exploration, in particular for missions outside of the Earth’s protective magnetosphere including to the Moon and Mars. Thus, it is critical to improve the scientific understanding of SEP events and use this understanding to develop and improve SEP forecasting capabilities to support operations. Many SEP models exist or are in development using a wide variety of approaches and with differing goals. These include computationally intensive physics-based models, fast and light empirical models, machine learning-based models, and mixed-model approaches. The aim of this paper is to summarize all of the SEP models currently developed in the scientific community, including a description of model approach, inputs and outputs, free parameters, and any published validations or comparisons with data.</p

Civic and Political E-Participation of Young Immigrants

The internet is considered as an important forum to empower and engage groups outside the traditional political systems. However, the ‘digital divide’ might imply several disparities and even reinforce exclusion of those with low economic and cultural capital. This article intends to question how democratic and inclusive this virtual public sphere is and in which terms the new dynamics in contemporary societies encourage mobility by excluded groups. Through quantitative methodology, we sought to analyse the differences between migrant (Angolans and Brazilians) and non-migrant groups in Portugal, as well as the e-participation forms adopted by them and the factors that could predict such participation. This is essential towards a wider knowledge about this field, strengthening the understanding concerning the ambivalence about the potential of the internet as a space for the inclusion of groups at risk of exclusion from participation and, consequently from real citizenship