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  • Eigen-analysis reveals components supporting super-resolution imaging of blinking fluorophores 

    Agarwal, Krishna; Prasad, Dilip Kumar (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-30)
    This paper presents eigen-analysis of image stack of blinking fluorophores to identify the components that enable super-resolved imaging of blinking fluorophores. Eigen-analysis reveals that the contributions of spatial ...
  • Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery 

    Fors, Ane Schwenke; Divine, Dmitry V; Doulgeris, Anthony Paul; Renner, Angelika; Gerland, Sebastian (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-03-23)
    In this paper we investigate the potential of melt pond fraction retrieval from X-band polarimetric synthetic aperture radar (SAR) on drifting first-year sea ice. Melt pond fractions retrieved from a helicopter-borne camera ...
  • X-, C-, and L-band SAR signatures of newly formed sea ice in Arctic leads during winter and spring 

    Johansson, Malin; Brekke, Camilla; Spreen, Gunnar; King, Jennifer A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-02)
    We examine an extensive synthetic aperture radar (SAR) data set from the Arctic Ocean spanning a time period from January to June 2015, with the aim of identifying multi-polarization parameters that can be used to accurately ...
  • Silicon nitride waveguide platform for fluorescence microscopy of living cells 

    Tinguely, Jean-Claude; Helle, Øystein Ivar; Ahluwalia, Balpreet Singh (Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
    Waveguide chip-based microscopy reduces the complexity of total internal reflection fluorescence (TIRF) microscopy, and adds features like large field of view illumination, decoupling of illumination and collection path ...
  • Solar Wind from Coronal Funnels and Transition Region Lyalpha 

    Esser, Ruth; Lie-Svendsen, Øystein; Janse, Åse Marit; Killie, Mari Anne (Journal article; Tidsskriftartikkel; Peer reviewed, 2005-08-10)
    Using a newly developed gyrotropic solar wind model that extends continuously from the mid-chromosphere to 1 AU and that accounts for radiative losses in the transition region, we have studied the difference between the ...
  • Assessment of RISAT-1 and Radarsat-2 for Sea Ice Observation from Hybrid-Polarity Perspective 

    Espeseth, Martine; Brekke, Camilla; Johansson, Malin (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-25)
    Utilizing several Synthetic Aperture Radar (SAR) missions will provide a data set with higher temporal resolution. It is of great importance to understand the difference between various available sensors and polarization ...
  • Measurements of ionic liquids thermal conductivity and thermal diffusivity 

    Zhao, Yansong; Zhen, Yingpeng; Jelle, Bjørn Petter; Boström, Tobias (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-02)
    Thermal conductivity and thermal diffusivity of ionic liquids (ILs) are investigated in this work. A hot disk method for ILs thermal conductivity and thermal diffusivity measurement is utilized. Firstly, the thermal ...
  • Unified transport scaling laws for plasma blobs and depletions 

    Wiesenberger, Matthias; Held, Markus; Kube, Ralph; Garcia, Odd Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-14)
    We study the dynamics of seeded plasma blobs and depletions in an (effective) gravitational field. For incompressible flows, the radial center of mass velocity of blobs and depletions is proportional to the square root ...
  • First wind shear observation in PMSE with the tristatic EISCAT VHF radar 

    Mann, Ingrid; Häggström, I.; Tjulin, A; Rostami, S; Anyairo, CC; Dalin, P (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-05)
    The Polar Summer Mesosphere has the lowest temperatures that occur in the entire Earth system. Water ice particles below the optically observable size range participate there in the formation of strong radar echoes (Polar ...
  • Spatial and temporal variability in MLT turbulence inferred from in situ and ground-based observations during the WADIS-1 sounding rocket campaign 

    Strelnikov, Boris; Szewczyk, Artur; Strelnikova, Irina; Latteck, Ralph; Baumgarten, Gerd; Lübken, Franz-Josef; Rapp, Markus; Fasoulas, Stefanos; Löhle, Stefan; Eberhart, Martin; Hoppe, Ulf-Peter; Dunker, Tim; Friedrich, Martin; Hedin, Jonas; Khaplanov, Mikhail; Gumbel, Jörg; Barjatya, Aroh (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-10)
    In summer 2013 the WADIS-1 sounding rocket campaign was conducted at the Andøya Space Center (ACS) in northern Norway (69 N, 16 E). Among other things, it addressed the question of the variability in mesosphere/lower ...
  • A Framework for Mellin Kind Series Expansion Methods 

    Brenn, Torgeir; Anfinsen, Stian Normann (Preprint; Manuskript, 2017-07-31)
    Mellin kind statistics (MKS) is the framework which arises if the Fourier transform is replaced with the Mellin transform when computing the characteristic function from the probability density function. We may then proceed ...
  • A revisit of the Gram-Charlier and Edgeworth series expansions 

    Brenn, Torgeir; Anfinsen, Stian Normann (Preprint; Manuskript, 2017-07-31)
    In this paper we make several observations on the Gram- Charlier and Edgeworth series, which are methods for modeling and approximating probability density functions.We present a simplified derivation which highlights ...
  • Fluctuations in electron cyclotron resonance plasma in a divergent magnetic field 

    Bhattacharjee, Sudeep; Fredriksen, Åshild; Chandra, Sayan (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02)
    The dependence of fluctuations on electron-neutral collision frequency (V<sub>en</sub>) and the radial location is investigated in an electron cyclotron resonance plasma in a divergent magnetic field region for a set of ...
  • Auto-correlation function and frequency spectrum due to a super-position of uncorrelated exponential pulses 

    Garcia, Odd Erik; Theodorsen, Audun (Peer reviewed, 2017-03)
    The auto-correlation function and the frequency power spectral density due to a super-position of uncorrelated exponential pulses are considered. These are shown to be independent of the degree of pulse overlap and thereby ...
  • Power law spectra and intermittent fluctuations due to uncorrelated Lorentzian pulses 

    Garcia, Odd Erik; Theodorsen, Audun (Peer reviewed, 2017-02)
    A stochastic model for intermittent fluctuations due to a super-position of uncorrelated Lorentzian pulses is presented. For a constant pulse duration, this is shown to result in an exponential power spectral density for ...
  • Modification of the high-latitude ionospheric F region by high-power HF radio waves at frequencies near the fifth and sixth electron gyroharmonics 

    Borisova, Tatiana D.; Blagoveshchenskaya, Nataly F.; Kalishin, Aleksei S.; Rietveld, Michael T.; Yeoman, Timothy Kenneth; Hägström, I. (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-01)
    We study the modification effects of the high-latitude ionospheric F region induced by a highpower O-mode HF radio wave injected towards the magnetic zenith, at frequencies near the fifth and sixth electron gyroharmonics ...
  • The behavior of electron density and temperature during ionospheric heating near the fifth electron gyrofrequency 

    Wu, Jun; Wu, Jian; Rietveld, Michael T.; Häggström, I.; Zhao, Haisheng; Xu, Zhengwen (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-01-27)
    The experimental phenomena involving the changes in electron temperature and electron density as a function of pump frequency during an ionospheric heating campaign at European Incoherent Scatter near Tromsø, Norway, are ...
  • A solvable blob-model for magnetized plasmas 

    Pecseli, Hans; Sortland, Daniel Selnes; Garcia, Odd Erik (Peer reviewed, 2016-09-06)
    A simple analytically solvable model for blobs in magnetized plasmas is proposed. The model gives results for a scaling of the blob velocity with the amplitude of the density perturbation. Limiting cases are considered: ...
  • Fluctuation statistics in the scrape-off layer of Alcator C-Mod 

    Kube, Ralph; Theodorsen, Audun; Garcia, Odd Erik; LaBombard, Brian; Terry, James L. (Peer reviewed, 2016-03-30)
    We study long time series of the ion saturation current and floating potential, sampled by Langmuir probes dwelled in the outboard mid-plane scrape-off layer and embedded in the lower divertor baffle of Alcator C-Mod. A ...
  • New capabilities of the upgraded EISCAT high-power HF facility 

    Rietveld, Michael T; Senior, Andrew; Markkanen, Jussi; Westman, Assar (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-22)
    The high-power HF (high-frequency) facility (commonly known as Heating) near Tromsø, Norway, which is an essential part of the European Incoherent Scatter Scientific Association, has been upgraded in certain key areas in ...

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