Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0785b&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0785
Physics
2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities, 2753 Numerical Modeling, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities
Scientific paper
Discrete impulsive whistler waves injected into the magnetosphere by lightning discharges are known to undergo magnetospheric reflections, leading to the observation at a fixed point of multiply reflecting components. Although the basic mechanism of reflection is well understood, the particular frequency-time signatures observed at different times and locations vary from single components to diffuse hiss-like echoes to well defined multiple discrete components. Two-dimensional raytracing calculations are used to determine the characteristic frequency-time (f-t) signature of lightning-generated whistler waves as observed at selected locations in the inner magnetosphere (L<6). Landau damping of the wave energy along the ray paths is computed using a typical suprathermal electron distribution based on recent observations with the HYDRA instrument on the POLAR spacecraft. The Landau damping determines the length of time each wave will be observable in the plasmasphere. Several previously observed oblique whistler-wave propagation features, including the so-called "Nu whistler" and the "walking trace" are discussed, identifying the magnetospheric conditions under which they are manifested. Our results bring out the dependence of the f-t signatures on the observation location and lightning source location for (i) a smooth magnetosphere and ionosphere, (ii) a smooth magnetosphere and irregular ionosphere, and (iii) a smooth ionosphere with an overlying striated magnetosphere.
Bell Timothy F.
Bortnik Jacob
Inan Umran S.
No associations
LandOfFree
Magnetospherically Reflecting Whistler Waves in a Smooth and Striated Magnetosphere 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 Magnetospherically Reflecting Whistler Waves in a Smooth and Striated Magnetosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetospherically Reflecting Whistler Waves in a Smooth and Striated Magnetosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1382431