scholarly journals Evolution of several space weather events connected with Forbush decreases

2008 ◽  
Vol 4 (S257) ◽  
pp. 57-59
Author(s):  
I. Dorotovič ◽  
K. Kudela ◽  
M. Lorenc ◽  
T. Pintér ◽  
M. Rybanský
Keyword(s):  
Energy Distribution ◽  
Recovery Time ◽  
Temporal Evolution ◽  
Forbush Decrease ◽  
High Energy ◽  
Radiation Belts ◽  
Proton Channel ◽  
The Earth ◽  
Weather Events ◽  
Simultaneous Decrease

AbstractIn our recent paper (Dorotovič et al. 2008a) we focused on a study of the Forbush decrease (FD) of January 17–18 and 21–22, 2005. It was shown that the corresponding recovery time can depend on the density of high-energy protons in the CME matter. In this paper we identified several additional events in the period between 1995 and 2007. We found that the majority of FDs studied is accompanied by an abrupt count increase in the proton channel P1 and by a simultaneous decrease in the channel P7 (GOES). However, the analysis of temporal evolution of all FDs did not confirm the hypothesis on different recovery time after FD as a function of the energy distribution of the particles penetrating into radiation belts of the Earth.

scholarly journals Human Radio Transmissions Create Barrier to "Killer Electrons"

Eos ◽  
2015 ◽  
Vol 96 ◽  
Author(s):  
JoAnna Wendel
Keyword(s):  
High Energy ◽  
Radiation Belts ◽  
Radio Waves ◽  
The Earth ◽  
High Energy Electrons

An interaction between radio waves and the Van Allen radiation belts creates a bubble around the Earth that high-energy electrons can't penetrate.

scholarly journals Temporal Evolution of the High-energy Irradiation and Water Content of TRAPPIST-1 Exoplanets

2017 ◽  
Vol 154 (3) ◽  
pp. 121 ◽  
Author(s):  
V. Bourrier ◽  
J. de Wit ◽  
E. Bolmont ◽  
V. Stamenković ◽  
P. J. Wheatley ◽  
...  
Keyword(s):  
Water Content ◽  
Temporal Evolution ◽  
High Energy ◽  
Energy Irradiation ◽  
High Energy Irradiation

scholarly journals The effects of the big storm events in the first half of 2015 on the radiation belts observed by EPT/PROBA-V

2016 ◽  
Vol 34 (1) ◽  
pp. 75-84 ◽  
Author(s):  
V. Pierrard ◽  
G. Lopez Rosson
Keyword(s):  
Charged Particle ◽  
High Resolution ◽  
Geomagnetic Storm ◽  
Energetic Particle ◽  
High Energy ◽  
Radiation Belts ◽  
Radiation Environment ◽  
Storm Event ◽  
Storm Events ◽  
Particle Radiation

Abstract. With the energetic particle telescope (EPT) performing with direct electron and proton discrimination on board the ESA satellite PROBA-V, we analyze the high-resolution measurements of the charged particle radiation environment at an altitude of 820 km for the year 2015. On 17 March 2015, a big geomagnetic storm event injected unusual fluxes up to low radial distances in the radiation belts. EPT electron measurements show a deep dropout at L > 4 starting during the main phase of the storm, associated to the penetration of high energy fluxes at L < 2 completely filling the slot region. After 10 days, the formation of a new slot around L = 2.8 for electrons of 500–600 keV separates the outer belt from the belt extending at other longitudes than the South Atlantic Anomaly. Two other major events appeared in January and June 2015, again with injections of electrons in the inner belt, contrary to what was observed in 2013 and 2014. These observations open many perspectives to better understand the source and loss mechanisms, and particularly concerning the formation of three belts.

scholarly journals Affrontare il cambiamento climatico è una ‘missione possibile’

2020 ◽  
Vol 32 (1) ◽  
pp. 154-160
Author(s):  
Roberto Buizza
Keyword(s):  
Climate Change ◽  
Greenhouse Gases ◽  
Heat Waves ◽  
Extreme Weather Events ◽  
Health Issues ◽  
Ice Melting ◽  
Greenhouse Gases Emissions ◽  
The Earth ◽  
Weather Events ◽  
Change Impact

Climate change is real, and we, humans, are responsible for it. Its impact is already evident, both on the Earth system (global warming, sea-level rise, sea-ice melting, more intense and frequent extreme weather events such as heat waves and fires) and on people (famines, health issues, migrations, political tensions and conflicts). We need immediate and concrete mitigation actions aiming to reduce greenhouse gases emissions, and adaptation actions to be able to cope with the increasing changing climate. We have to reach zero-net greenhouse gases emissions as soon as possible, by reducing emissions by at least 5% a year, starting from now. Otherwise the climate change impact will become more and more severe: it will induce more injustice, and it will have a major impact on people health. We have the resources and the technologies to deal with it: we must have the courage to change and transform and deal with it. Addressing climate change is not impossible: to the contrary, it is a ‘possible mission’.

Temporal evolution of relativistic electrons induced by fast magnetosonic waves in the radiation belts

2013 ◽  
Vol 55 (6) ◽  
pp. 062001 ◽  
Author(s):  
Chang Yang ◽  
Yihua He ◽  
Lewei Zhang ◽  
Qinghua Zhou ◽  
Fuliang Xiao
Keyword(s):  
Temporal Evolution ◽  
Radiation Belts ◽  
Relativistic Electrons

scholarly journals The particle and magnetic environments surrounding close-in exoplanets

2015 ◽  
Vol 11 (S320) ◽  
pp. 397-402
Author(s):  
A. A. Vidotto ◽  
R. Fares ◽  
M. Jardine ◽  
C. Moutou ◽  
J.-F. Donati
Keyword(s):  
Magnetic Fields ◽  
Radio Emission ◽  
Magnetic Field Intensity ◽  
Three Dimensional ◽  
Stellar Winds ◽  
Local Conditions ◽  
Hot Jupiters ◽  
The Earth ◽  
Weather Events ◽  
Host Stars

AbstractThe proper characterisation of stellar winds is essential for the study of propagation of eruptive events (flares, coronal mass ejections) and the study of space weather events on exoplanets. Here, we quantitatively investigate the nature of the stellar winds surrounding the hot Jupiters HD46375b, HD73256b, HD102195b, HD130322b, HD179949b. We simulate the three-dimensional winds of their host stars, in which we directly incorporate their observed surface magnetic fields. With that, we derive the wind properties at the position of the hot-Jupiters’ orbits (temperature, velocity, magnetic field intensity and pressure). We show that the exoplanets studied here are immersed in a local stellar wind that is much denser than the local conditions encountered around the solar system planets (e.g., 5 orders of magnitude denser than the conditions experienced by the Earth). The environment surrounding these exoplanets also differs in terms of dynamics (slower stellar winds, but higher Keplerian velocities) and ambient magnetic fields (2 to 3 orders of magnitude larger than the interplanetary medium surrounding the Earth). The characterisation of the host star's wind is also crucial for the study of how the wind interacts with exoplanets. For example, we compute the exoplanetary radio emission that is released in the wind-exoplanet interaction. For the hot-Jupiters studied here, we find radio fluxes ranging from 0.02 to 0.13 mJy. These fluxes could become orders of magnitude higher when stellar eruptions impact exoplanets, increasing the potential of detecting exoplanetary radio emission.

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