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A statistical study of incoherent scatter plasma line enhancements during the International Polar Year ’07-’08 in Svalbard
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.
2016 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

There was a large radar campaign during 2007 and 2008, the International Polar Year (IPY),and at that time the EISCAT Svalbard Radar was operated and measured the ionosphere continuouslyat most times. This report presents statistical results from an electron enhancementpoint of view. Until now there has been some research into the field and results based on theions in the ionosphere, and the enhancements we refer to as Naturally enhanced ion acousticlines (NEIALs). Plasma line data from May 2007 to February 2008 has been analysed inorder to find and classify enhancements as NEIALs have been classified but with respect tothe electron distribution instead of the ion distribution. A method of detection was developedin order to differentiate the enhancements from the background with a relation between theminimum and maximum power of each measured dump. Results show that there is a largedifference between the downshifted plasma lines and the upshifted plasma lines, both has arange distribution peak at 180 km and the upshifted plasma line has another peak at 230 kmwhich the downshifted plasma line does not. The occurrence rate of the enhancements was1.64 % for the downshifted plasma line and 4.69 % for the upshifted plasma line. Threedifferent types of enhancements are classified using the variance distribution for the peakfrequency of that detected dump, Single, Profile, and Diffuse. The Single enhancements havea bit different spectral, range, and time of day distributions than of the Profile and Diffusedistributions. The Diffuse classifications are mostly wrong classifications and aliasing and itis very similar to Profile enhancements as seen by its distribution.

Ort, förlag, år, upplaga, sidor
2016. , 42 s.
Nyckelord [en]
Atmosphere, Ionosphere, Northen Lights, Aurora, Space Physics, Physics, EISCAT, Incoherent Scatter, Plasma
Nationell ämneskategori
Geofysik
Identifikatorer
URN: urn:nbn:se:ltu:diva-60158OAI: oai:DiVA.org:ltu-60158DiVA: diva2:1044800
Externt samarbete
Kungliga Tekniska Högskolan
Ämne / kurs
Examensarbete, minst 30 hp
Utbildningsprogram
Civilingenjör, Rymdteknik
Handledare
Examinatorer
Tillgänglig från: 2016-11-07 Skapad: 2016-11-07 Senast uppdaterad: 2016-11-07Bibliografiskt granskad

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Hammarsten, Michael
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