Soliton-induced spectrally uniform ion line power enhancements at the ionospheric F region peak
2012 (English)In: Earth Planets and Space, ISSN 1343-8832, E-ISSN 1880-5981, Vol. 64, no 7, 605-611 p.Article in journal (Refereed) Published
We present European incoherent scatter (EISCAT) observations of spectrally uniform ion line power enhancements (SUIPE), where the up- and downshifted shoulder and the spectral valley between them are enhanced simultaneously and equally. We have identified 48 cases of this type of ion line enhancements in data from the EISCAT Svalbard radar taken during the International Polar Year (extending from March 2007 to the end of February 2008). The SUIPEs are observed at altitudes between 210 km and 280 km with a standard deviation of 9% of the average occurrence height 230 km. The power enhancements are one order of magnitude above the thermal level. The SUIPEs occur at the ionospheric F region peak with 85% of the cases located within 10 km of the peak. The occurrence shows a clear preference for magnetically disturbed conditions, with the likelihood of occurrence increasing with increasing K index. A majority of the events occur in the magnetic evening to pre-midnight sector.
Place, publisher, year, edition, pages
Tokyo: Terra scientific publishing company , 2012. Vol. 64, no 7, 605-611 p.
auroral ionosphere, radar observations, plasma waves and instabilities, solitons and solitary waves
IdentifiersURN: urn:nbn:se:umu:diva-42827DOI: 10.5047/eps.2012.02.005ISI: 000308133500005OAI: oai:DiVA.org:umu-42827DiVA: diva2:410482