40 Papers
336 Citations
Klaus Torkar is an academic researcher from Institut für Weltraumforschung (Space Research Institute). The author has contributed to research in topics: Mesosphere & Substorm. The author has an hindex of 15, co-authored 40 publications.
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Papers
Dust of comet 67P/Churyumov-Gerasimenko collected by Rosetta/MIDAS: classification and extension to the nanometre scale
Thurid Mannel,Mark Bentley,P.D. Boakes,H. Jeszenszky,Pascale Ehrenfreund,Cécile Engrand,Christian Koeberl,Anny Chantal Levasseur-Regourd,J. Romstedt,Roland Schmied,Klaus Torkar,Iris Weber +11 more
TL;DR: In this article, 3D topographic images with resolutions of down to 8nm were analyzed to determine the subunit sizes of particles on the nanometre scale. But the results were limited to the smallest subunits of cometary dust.
Positive ion depletion in a noctilucent cloud
TL;DR: In this article, the authors measured the positive ion composition in the mesosphere between 80 and 98.4 km over Kiruna, Sweden, in summer 1993 using a Mattauch-Herzog type of mass spectrometer.
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•Journal Article
Influences of ice particles on the ion chemistry of the polar summer mesosphere : Layered Phenomenoa in the mesopause region (LPMR)
TL;DR: In this paper, an ion-chemical model that for the first time features close coupling with cluster growth and ice particle charging is presented, and the authors show that electron capture to existing particles can significantly enhance the ionic nucleation of new particles.
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An empirical model of the nonauroral D Region
Martin Friedrich,Klaus Torkar +1 more
TL;DR: In this article, an empirical model of the D region electron densities is presented, which is based on rocket-borne wave propagation data from mid-latitude and equatorial regions obtained during quiet conditions only.
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Coordinated balloon‐satellite observations of energetic particles at the onset of a magnetospheric substorm
G. Kremser,J. Bjordal,Lars P. Block,K. Brønstad,M. Håvåg,I. B. Iversen,Jorma Kangas,A. Korth,M.M. Madsen,J. Niskanen,W. Riedler,Johan Stadsnes,P. Tanskanen,Klaus Torkar,S. Ullaland +14 more
TL;DR: In this paper, the authors investigated variations of the distribution of energetic charged particles at the onset of a magnetospheric substorm on July 3, 1979, and concluded that the electron precipitation was directly related to the injection of electrons and that the injection took place well earthward of the near-earth reconnection region postulated in some substorm models.
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