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Article
Quantum phase transitions with parity-symmetry breaking and hysteresis
An ultracold gas trapped in a symmetric double-well potential should populate both wells equally; however, the gas spontaneously localizes in one well when the interaction between atoms reaches a critical valu...
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Article
Measurement of the mobility edge for 3D Anderson localization
Anderson localization is a universal phenomenon affecting non-interacting quantum particles in a disordered environment. In three spatial dimensions, theory predicts a quantum phase transition from localizatio...
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Chapter
Loop Models from SOHO Observations
The Coronal Diagnostic Spectrometer (CDS) on SOHO is a grazing/normal incidence spectrograph, aimed to produce stigmatic spectra of selected regions of the solar surface in six spectral windows of the extreme ...
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Article
Loop Models from SOHO Observations
The Coronal Diagnostic Spectrometer (CDS) on SOHO is a grazing/normal incidence spectrograph, aimed to produce stigmatic spectra of selected regions of the solar surface in six spectral windows of the extreme ...
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Chapter
Observation of Transition Region Fine Structures with SOHO/SUMER
We present a preliminary analysis of two quiet Sun transition region areas observed with the SOHO/SUMER spectrometer, using lines from oxygen, nitrogen and silicon. The average quiet Sun physical parameters ar...
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Article
Observation of Transition Region Fine Structures with Soho/Sumer
We present a preliminary analysis of two quiet Sun transition region areas observed with the SOHO/SUMER spectrometer, using lines from oxygen, nitrogen and silicon. The average quiet Sun physical parameters ar...
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Article
Soho Cds–nis in-flight intensity calibration using a plasma diagnostic method
The internal intensity calibration of the Coronal Diagnostic Spectrometer (CDS) – Normal Incidence Spectrometer (NIS) is studied using the Arcetri diagnostic method. A large number of spectral lines observed b...
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Chapter
SOHO CDS-NIS in-Flight Intensity Calibration Using a Plasma Diagnostic Method
The internal intensity calibration of the Coronal Diagnostic Spectrometer (CDS) — Normal Incidence Spectrometer (NIS) is studied using the Arcetri diagnostic method. A large number of spectral lines observed b...
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Article
The Xray-EUV spectrum of optically thin plasmas
The new observations of the Extreme Ultraviolet Explorer Spectrometers on EUVE and the future high resolution observation by Coronal Diagnostic Spectrometer (CDS) and SUMER on SOHO have suggested the revision ...
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Chapter and Conference Paper
The Xray-Euv Spectrum of Optically Thin Plasmas
The new observations of the Extreme Ultraviolet Explorer Spectrometers on EUVE and the future high resolution observation by Coronal Diagnostic Spectrometer (CDS) and SUMER on SOHO have suggested the revision ...
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Chapter and Conference Paper
Electron densities and temperatures in solar and stellar atmospheres
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Chapter and Conference Paper
On Solar and Stellar Coronal Models
Using a parametrized profile of conductive flux, XUV data from coronal active regions on the sun and from late type stars are analyzed. A best χ2 fit is used to deduce the parameters by comparison with experiment...
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Chapter and Conference Paper
Detection of an x-ray flare from a single G dwarf star
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Chapter and Conference Paper
Coronae of late-type stars observed with exosat
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Article
EXOSAT observations of late-type stars: The application of coronal loop models
We apply solar-type coronal loop models to X-ray and UV observations of late-type stars. We derive from EXOSAT and IUE observations constraints on the temperature, pressure and size of the emitting structures.
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Chapter and Conference Paper
Exosat Observations of Late-Type Stars: The Application of Coronal Loop Models
We apply solar-type coronal loop models to X-ray and UV observations of late-type stars. We derive from EXOSAT and IUE observations constraints on the temperature, pressure and size of the emitting structures.
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Chapter and Conference Paper
Transition region — coronal models: A comparison with XUV observations
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Article
The coronal structure of active regions
A four-parameter model which assumes a Gaussian dependence of both temperature and pressure on distance from center is used to fit the compact part of coronal active regions as observed in X-ray photographs fr...
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Article
Thermal models of flaring region based on observations by the SOLRAD 10 satellite
A number of solar X-ray bursts, observed with the SOLRAD 10 satellite on 1971 September 14, 17, November 28 and 1972 August 1, have been analysed. From the differential emission measure distribution deduced fr...
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Article
Non-thermal ionization and recombination processes during solar flares
Ionization and recombination processes are studied for a plasma of which the electrons follow a power-law energy distribution.