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When we look out into space, all of the astrophysical objects that we see are embedded in magnetic fields. This is true not only in the neighborhood of stars and planets, but also in the deep space be...
Large-scale magnetic field generation via the Kelvin-Helmholtz instability
Large-scale magnetic field generation Kelvin-Helmholtz instability
2011/10/18
We present the first self-consistent three-dimensional particle-in-cell simulations of the Kelvin-Helmholtz instability (KHI) in an unmagnetized scenario. We discuss the main features, including densi...
Classification of field dwarfs and giants in RAVE and its use in stellar stream detection
Galaxy Astrophysics (astro-ph.GA)
2011/1/7
An efficient separation between dwarfs and giants in surveys of bright stars is important, especially for studies in which distances are estimated through photometric parallax relations.
Waterfall field in hybrid inflation and curvature perturbation
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/6
We study carefully the contribution of the waterfall field to the curvature perturbation at the end of hybrid inflation. In particular we clarify the parameter dependence analytically under reasonable...
The formation of high-field magnetic white dwarfs from common envelopes
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/27
The origin of highly-magnetized white dwarfs has remained a mystery since their initial discovery. Recent observations indicate that the formation of high-field magnetic white dwarfs is intimately rel...
Dynamo generated field emergence through recurrent plasmoid ejections
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/23
Magnetic buoyancy is believed to drive the transport of magnetic flux tubes from the convection zone to the surface of the Sun. The magnetic fields form twisted loop-like structures in the solar atmos...
Analysis of Plasma and Field Conditions during Some Intensely Geoeffective Transient Solar/Interplanetary Disturbances of Solar Cycle 23
Earth geomagnetic storm Sun'solar and wind magnetosphere coupling
2010/9/17
The problem of solar wind–magnetosphere coupling is investigated for intense geomagnetic storms (Dst ≤ −100 nT) that occurred during solar cycle 23. For this purpose interplanetary plasma and fi...
Magnetic and Velocity Field Variations in the Active Regions NOAA 10486 and NOAA 10488
Sun magnetogram—Sun Dopplergram—Sun flare
2010/9/15
We study the magnetic and velocity field evolution in the two magnetically complex active regions NOAA 10486 and NOAA 10488 observed during October–November 2003.We have used the available data to exa...
Interaction of plasma cloud with external electric field in lower ionosphere
plasma cloud lower ionosphere
2017/3/22
In the auroral lower-E and upper-D region of the
ionosphere, plasma clouds, such as sporadic-E layers and
meteor plasma trails, occur daily. Large-scale electric fields,
created by the magnetospher...
The LABOCA survey of the Extended Chandra Deep Field South: Two modes of star formation in AGN hosts?
galaxies active galaxies starburst infrared galaxies
2010/3/8
We study the co-existence of star formation and AGN activity in X-ray selected AGN by analyzing stacked 870um submm emission from a deep and wide map of the Extended Chandra Deep Field South, obtained...