Physics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010adspr..45..804k&link_type=abstract
Advances in Space Research, Volume 45, Issue 6, p. 804-811.
Physics
Scientific paper
Earth-directed interplanetary shocks associated with coronal mass ejections (CMEs) are known to have a severe impact on the magnetosphere, causing strong geomagnetic storms and substorms. Hence, early detection of such shocks is important. Here we study the feasibility of radar detection of interplanetary shocks. We consider a scattering mechanism, which is based on the induced scattering t+l⇄t of a radar wave by anisotropic Langmuir turbulence, being generated by the shock-accelerated electrons. The problem is studied for an arbitrary angle between the electron beam and the incident radar wave, vb∧Wkt. If expressed in local plasma frequencies, ω, the altitudes span is ω/8≲ω⩽ω for vb∧=kt=π/2, where ω is a frequency of the transmitted radar wave. Thus the scattering occurs much closer to the radar in the second case than in the first. Detection of the scattered signal, in the general case, requires a remote receiver, since the radar wave backscatters only for vb∧kt=π.
Khotyaintsev Mykola V.
Khotyaintsev Yuri V.
Mel'nik Valentin N.
Thidé Bo
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