Sökning: onr:"swepub:oai:DiVA.org:uu-94977" >
Radar detection of ...
-
Khotyaintsev, MykolaUppsala universitet,Institutionen för astronomi och rymdfysik
(författare)
Radar detection of interplanetary shocks : scattering by anisotropic Langmuir turbulence
- Artikel/kapitelEngelska2010
Förlag, utgivningsår, omfång ...
-
Elsevier BV,2010
-
printrdacarrier
Nummerbeteckningar
-
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
Kompletterande språkuppgifter
-
Språk:engelska
-
Sammanfattning på:engelska
Ingår i deldatabas
Klassifikation
-
Ämneskategori:ref swepub-contenttype
-
Ämneskategori:art swepub-publicationtype
Anmärkningar
-
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.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
-
Mel'nik, Valentin
(författare)
-
Thidé, BoUppsala universitet,Institutionen för fysik och astronomi,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)bothide
(författare)
-
Khotyaintsev, Yu V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)ykh28990
(författare)
-
Uppsala universitetInstitutionen för astronomi och rymdfysik
(creator_code:org_t)
Sammanhörande titlar
-
Ingår i:Advances in Space Research: Elsevier BV45:6, s. 804-8110273-11771879-1948
Internetlänk
Hitta via bibliotek
Till lärosätets databas