Origin of energetic electron precipitation >30 keV into the atmosphere

Details Origin of energetic electron precipitation >30 keV into the atmosphere Origin of energetic electron precipitation >30 keV into the atmosphere

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11500f08l&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue 8, CiteID A00F08

Physics

7

Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Substorms, Global Change: Solar Variability (7537)

Scientific paper

Energetic electrons are deposited into the atmosphere from Earth's inner magnetosphere, resulting in the production of odd nitrogen (NOx). During polar night, NOx can be transported to low altitudes, where it can destroy ozone, affecting the atmospheric radiation balance. Since the flux of energetic electrons trapped in the magnetosphere is related to solar activity, the precipitation of these electrons into Earth's atmosphere provides a link between solar variability and changes in atmospheric chemistry which may affect Earth's climate. To determine the global distribution of the precipitating flux, we have built a statistical model binned by auroral electrojet (AE) index, magnetic local time (MLT), and L shell of E > 30 keV precipitating electrons from the Medium Energy Proton and Electron Detector (MEPED) on board the NOAA Polar Orbiting Environmental Satellites (POES) low-altitude satellites NOAA-15, NOAA-16, NOAA-17, and NOAA-18. We show that the precipitating flux increases with geomagnetic activity, suggesting that the flux is related to substorm activity. The precipitating fluxes maximize during active conditions where they are primarily seen outside of the plasmapause on the dawnside. The global distribution of the precipitating flux of E > 30 keV electrons is well-correlated with the global distribution of lower-band chorus waves as observed by the plasma wave experiment onboard the Combined Release and Radiation Effects Satellite (CRRES) satellite. In addition, the electron precipitation occurs where the pitch angle diffusion coefficient due to resonant interaction between electrons and whistler mode chorus waves is high, as calculated using the pitch angle and energy diffusion of ions and electrons (PADIE) code. Our results suggest that lower-band chorus is very important for scattering >30 keV electrons from Earth's inner magnetosphere into the atmosphere.

Affiliated with

Also associated with

No associations

Rating

Origin of energetic electron precipitation >30 keV into the atmosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Origin of energetic electron precipitation >30 keV into the atmosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Origin of energetic electron precipitation >30 keV into the atmosphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1584420