scholarly journals Impact of EMIC‐Wave Driven Electron Precipitation on the Radiation Belts and the Atmosphere

2021 ◽  
Vol 126 (3) ◽  
Author(s):  
A. T. Hendry ◽  
A. Seppälä ◽  
C. J. Rodger ◽  
M. A. Clilverd
Keyword(s):  
Radiation Belts ◽  
Electron Precipitation ◽  
Emic Wave

Modeling particle precipitation and effects on the ionospheric conductivity

2020 ◽  
Author(s):  
Yiqun Yu ◽  
Xingbin Tian ◽  
Minghui Zhu ◽  
Shreedevi Pr
Keyword(s):  
Ring Current ◽  
Transport Model ◽  
Current Model ◽  
Electron Precipitation ◽  
Plasma Convection ◽  
Particle Precipitation ◽  
Ionospheric Conductivity ◽  
Emic Wave ◽  
Intense Storm ◽  
Stream Transport

<p>Particle precipitation originated from the magnetosphere provides important energy source to the upper atmosphere, leading to ionization and enhancement of conductivity, which in turn changes the electric potential in the MI system to influence the plasma convection in the magnetosphere. In this study, we simulate ring current particle precipitation caused by several important loss mechanisms, including electron precipitation due to whistler wave scattering, ion precipitation due to EMIC wave diffusion and field line curvature scattering. These physical mechanisms are implemented in the kinetic ring current model via diffusion equation with associated pitch angle diffusion coefficients. The precipitation is subsequently input to a two-stream transport model at the top of ionosphere in order to examine its impact on the ionsopheric conductivity. It is found that during intense storm time, electron precipitation of tens of keV dominates in the dawn sector and leads to significant enhancement of conductivity at low altitudes. On the other hand, proton precipitation on the nightside mostly occurs for energy below 10 keV, and contributes to ionization above 100 km, resulting in enhancement of conductivity there. Consequently, the height profile of both Pedersen and Hall conductivity exhibits two layers, potentially complicating the current closure in the ionosphere system.</p>

Determining latitudinal extent of energetic electron precipitation using MEPED on-board NOAA POES

2020 ◽  
Author(s):  
Eldho Midhun Babu ◽  
Hilde Nesse Tyssøy ◽  
Christine Smith-Johnsen ◽  
Ville Aleksi Maliniemi ◽  
Josephine Alessandra Salice ◽  
...  
Keyword(s):  
Solar Wind ◽  
Radiation Belt ◽  
Climate Models ◽  
Stratospheric Ozone ◽  
Energetic Electron ◽  
Radiation Belts ◽  
Atmospheric Dynamics ◽  
Electron Precipitation ◽  
Atmospheric Effects ◽  
The Earth

<p>Energetic electron precipitation (EEP) from the plasma sheet and the radiation belts, can collide with gases in the atmosphere and deposit their energy. EEP increase the production of NOx and HOx, which will catalytically destroy stratospheric ozone, an important element of atmospheric dynamics. The particle precipitation also causes variation in the radiation belt population. Therefore, measurement of latitudinal extend of the precipitation boundaries is important in quantifying atmospheric effects of Sun-Earth interaction and threats to spacecrafts and astronauts in the Earth’s radiation belt. <br>This study uses measurements by MEPED detectors of six NOAA/POES and EUMETSAT/METOP satellites during the year 2010 to determine the latitudinal boundaries of EEP and its variability with geomagnetic activity and solar wind drivers. Variation of the boundaries with respect to different particle energies and magnetic local time is studied. The result will be a key element for constructing a model of EEP variability to be applied in atmosphere climate models.</p>

scholarly journals Observations of relativistic electron precipitation from the radiation belts driven by EMIC waves

2008 ◽  
Vol 35 (16) ◽  
Author(s):  
Craig J. Rodger ◽  
Tero Raita ◽  
Mark A. Clilverd ◽  
Annika Seppälä ◽  
Sarah Dietrich ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Radiation Belts ◽  
Electron Precipitation ◽  
Emic Waves

scholarly journals Confirmation of EMIC wave-driven relativistic electron precipitation

2016 ◽  
Vol 121 (6) ◽  
pp. 5366-5383 ◽  
Author(s):  
Aaron T. Hendry ◽  
Craig J. Rodger ◽  
Mark A. Clilverd ◽  
Mark J. Engebretson ◽  
Ian R. Mann ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Electron Precipitation ◽  
Emic Wave

scholarly journals Observations of coincident EMIC wave activity and duskside energetic electron precipitation on 18-19 January 2013

2015 ◽  
Vol 42 (14) ◽  
pp. 5727-5735 ◽  
Author(s):  
L. W. Blum ◽  
A. Halford ◽  
R. Millan ◽  
J. W. Bonnell ◽  
J. Goldstein ◽  
...  
Keyword(s):  
Energetic Electron ◽  
Wave Activity ◽  
Electron Precipitation ◽  
Emic Wave
Sign in / Sign up

Export Citation Format

Share Document