scholarly journals Critical behavior of a quantum chain with four-spin interactions in the presence of longitudinal and transverse magnetic fields

2014 ◽  
Vol 89 (3) ◽  
Author(s):  
B. Boechat ◽  
J. Florencio ◽  
A. Saguia ◽  
O. F. de Alcantara Bonfim
Keyword(s):  
Magnetic Fields ◽  
Critical Behavior ◽  
Transverse Magnetic ◽  
Spin Interactions ◽  
Quantum Chain

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

Control of photon beam dose profiles by localized transverse magnetic fields

2000 ◽  
Vol 45 (12) ◽  
pp. N177-N182 ◽  
Author(s):  
L Reiffel ◽  
A Li ◽  
J Chu ◽  
R W Wheatley ◽  
S Naqvi ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Transverse Magnetic ◽  
Photon Beam ◽  
Beam Dose

AMBIPOLAR DIFFUSION AND TURBULENT MAGNETIC FIELDS IN MOLECULAR CLOUDS

2011 ◽  
Vol 26 (04) ◽  
pp. 235-249 ◽  
Author(s):  
MARTIN HOUDE ◽  
TALAYEH HEZAREH ◽  
HUA-BAI LI ◽  
THOMAS G. PHILLIPS
Keyword(s):  
Magnetic Fields ◽  
Molecular Clouds ◽  
Ambipolar Diffusion ◽  
Star Forming ◽  
Star Forming Regions ◽  
Spin Interactions ◽  
Line Narrowing ◽  
Weakly Ionized ◽  
Novel Method

We review the introduction and development of a novel method for the characterization of magnetic fields in star-forming regions. The technique is based on the comparison of spectral line profiles from coexistent neutral and ion molecular species commonly detected in molecular clouds, sites of star formation. Unlike other methods used to study magnetic fields in the cold interstellar medium, this ion/neutral technique is not based on spin interactions with the field. Instead, it relies on and takes advantage of the strong cyclotron coupling between the ions and magnetic fields, thus exposing what is probably the clearest observational manifestation of magnetic fields in the cold, weakly ionized gas that characterizes the interior of molecular clouds. We will show how recent development and modeling of the ensuing ion line narrowing effect leads to a determination of the ambipolar diffusion scale involving the turbulent component of magnetic fields in star-forming regions, as well as the strength of the ordered component of the magnetic field.

scholarly journals Diamond-nitrogen-vacancy electronic and nuclear spin-state anticrossings under weak transverse magnetic fields

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
Hannah Clevenson ◽  
Edward H. Chen ◽  
Florian Dolde ◽  
Carson Teale ◽  
Dirk Englund ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Spin State ◽  
Nuclear Spin ◽  
Transverse Magnetic ◽  
Nitrogen Vacancy

Radiation-induced resistance oscillation and instability in GaAS/AlGaAS heterostructure under transverse magnetic fields

2008 ◽  
Vol 17 (6) ◽  
pp. 2010-2017
Author(s):  
Yang Gui ◽  
Tu Bi-Hong ◽  
Li Guo-Hui ◽  
Zhao Hong-Wei ◽  
Zhou Shi-Ping
Keyword(s):  
Magnetic Fields ◽  
Induced Resistance ◽  
Transverse Magnetic ◽  
Radiation Induced
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