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- Khotyaintsev, MykolaUppsala universitet,Institutionen för astronomi och rymdfysik (author)
Radar detection of interplanetary shocks : scattering by anisotropic Langmuir turbulence
- Article/chapterEnglish2010
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- Elsevier BV,2010
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:uu-94977
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-94977URI
- https://doi.org/10.1016/j.asr.2009.12.005DOI
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- Language:English
- Summary in:English
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- 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∧ kt, and special emphasis is put on the study of a dependence of the scattering process on this angle. We obtain and analyze analytical expressions for the frequency shift, scattering cross-section of the turbulence, coefficient of absorption (due to scattering), and the optical depth. We show that the detection of such shocks is possible if the turbulence energy density exceeds W = 10- 5 nT (nT is the thermal energy density of a plasma), which is quite realistic according to our estimations. The altitudes in the solar corona where reflections may occur depend on the angle vb∧ kt. If expressed in local plasma frequencies, ωp, the altitudes span is ωt / 8 ≲ ωp ≤ ωt for vb∧ kt = π and ωt / 120 ≲ ωp ≤ ωt for vb∧ kt = π / 2, where ωt 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.
Subject headings and genre
- NATURVETENSKAP Fysik hsv//swe
- NATURAL SCIENCES Physical Sciences hsv//eng
- Coronal mass ejection
- Plasma turbulence
- Radar
- Scattering of electromagnetic radiation in plasmas
- Solar radar
- Space weather
- Physics
- Fysik
Added entries (persons, corporate bodies, meetings, titles ...)
- Mel'nik, Valentin (author)
- Thidé, BoUppsala universitet,Institutionen för fysik och astronomi,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)bothide (author)
- Khotyaintsev, Yu V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990 (author)
- Uppsala universitetInstitutionen för astronomi och rymdfysik (creator_code:org_t)
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- In:Advances in Space Research: Elsevier BV45:6, s. 804-8110273-11771879-1948
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