Low-frequency whistler waves and shocklets observed at quasi-perpendicular interplanetary shocks

Details Low-frequency whistler waves and shocklets observed at quasi-perpendicular interplanetary shocks Low-frequency whistler waves and shocklets observed at quasi-perpendicular interplanetary shocks

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11410106w&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A10, CiteID A10106

Physics

Plasma Physics

7

Interplanetary Physics: Interplanetary Shocks, Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Plasma Energization, Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

We present observations of low-frequency waves (0.25 Hz < f < 10 Hz) at five quasi-perpendicular interplanetary (IP) shocks observed by the Wind spacecraft. Four of the five IP shocks had oblique precursor whistler waves propagating at angles with respect to the magnetic field of 20°-50° and large propagation angles with respect to the shock normal; thus they do not appear to be phase standing. One event, the strongest in our study and likely supercritical, had low-frequency waves consistent with steepened magnetosonic waves called shocklets. The shocklets are seen in association with diffuse ion distributions. Both the shocklets and precursor whistlers are often seen simultaneously with anisotropic electron distributions unstable to the whistler heat flux instability. The IP shock with upstream shocklets showed much stronger electron heating across the shock ramp than the four events without upstream shocklets. These results may offer new insights into collisionless shock dissipation and wave-particle interactions in the solar wind.

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