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A stochastic theory for temporal fluctuations in self-organized critical systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2008)
Organization of the magnetosphere during substorms
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
The change in degree of organization of the magnetosphere during substorms is investigated by analyzing various geomagnetic indices, as well as interplanetary magnetic field z-component and solar wind velocity x-component. ...
Stretched exponential relaxation and ac universality in disordered dielectrics
(Working paper; Arbeidsnotat, 2007-05-30)
This paper is concerned with the connection between the properties of dielectric relaxation and ac (alternating-current) conduction in disordered dielectrics. The discussion is divided between the classical linear-response ...
Burst statistics of fluctuations in a simple magnetized torus configuration
(Working paper; Arbeidsnotat, 2009-04-19)
In a toroidal plasma confined by a purely toroidal magnetic field the plasma transport is governed by electrostatic turbulence driven by the flute interchange instability on the low-field side of the torus cross section. ...
Spatial scaling of optical fluctuations during substorm-time aurora
(Journal article; Tidsskriftartikkel; Peer reviewed, 2007)
Are there multiple scaling regimes in Holocene temperature records?
(Journal article; Tidsskriftartikkel, 2015-07-17)
The concept of multiple scaling regimes in temperature time series is examined, with emphasis on the question whether or not a mono-scaling model can be rejected from the data at hand. A model with only one regime is ...
Long-memory effects in linear response models of Earth's temperature and implications for future global warming
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-07-15)
A linearized energy-balance model for global temperature is formulated, featuring a scale-invariant longrange memory (LRM) response and stochastic forcing representing the influence on the ocean heat reservoir from ...
Attribution in the presence of a long-memory climate response
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-18)
Multiple, linear regression is employed to attribute variability in the global surface temperature to various forcing components and prominent internal climatic modes. The purpose of the study is to assess how sensitive ...
Modeling temporal fluctuations in avalanching system
(Working paper; Arbeidsnotat, 2008-07-22)
We demonstrate how to model the toppling activity in avalanching systems by stochastic differential equations (SDEs). The theory is developed as a generalization of the classical mean field approach to sandpile dynamics ...
Stretched-exponential decay functions from a self-consistent model of dielectric relaxation
(Working paper; Arbeidsnotat, 2007-07-22)
There are many materials whose dielectric properties are described by a stretched exponential, the so-called Kohlrausch-Williams-Watts (KWW) relaxation function. Its physical origin and statistical-mechanical foundation ...