The self absorption of gyro-synchrotron emission in a magnetic dipole field: Microwave impulsive burst and hard X-ray burst

Solar Physics ◽  
1972 ◽  
Vol 26 (1) ◽  
pp. 151-175 ◽  
Author(s):  
Tatsuo Takakura
Keyword(s):  
Magnetic Dipole ◽  
The Self ◽  
Dipole Field ◽  
Synchrotron Emission ◽  
X Ray ◽  
Magnetic Dipole Field

Asymmetric X-ray Pulsar Beam Emission

1986 ◽  
Vol 6 (4) ◽  
pp. 446-452 ◽  
Author(s):  
Whayne E. P. Padden ◽  
Michelle C. Storey
Keyword(s):  
Neutron Star ◽  
Magnetic Dipole ◽  
Accretion Rate ◽  
Rotation Period ◽  
Dipole Field ◽  
X Ray ◽  
Magnetic Dipole Field ◽  
Star Surface ◽  
Matter Transfer

AbstractMany of the X-ray pulsars for which X-ray lightcurves have been presented in the literature exhibit asymmetric emission beams. We postulate the existence of an off-centre magnetic dipole field embedded in the rotating neutron star and show that such a field leads to varying rates of matter transfer between an accretion dise and the neutron star surface, over a rotation period. Assuming that the accretion rate onto the surface is simply related to the luminosity, we show that most of the observed asymmetries can be accounted for by this mechanism.

scholarly journals Calibration of Radiocarbon Dates for the Late Pleistocene Using U/Th Dates on Stalagmites

Radiocarbon ◽  
1997 ◽  
Vol 39 (1) ◽  
pp. 27-32 ◽  
Author(s):  
John C. Vogel ◽  
Joel Kronfeld
Keyword(s):  
South Africa ◽  
Magnetic Dipole ◽  
Satisfactory Agreement ◽  
Late Pleistocene ◽  
Calibration Curve ◽  
Dipole Field ◽  
Radiocarbon Dates ◽  
The Past ◽  
The Earth ◽  
Magnetic Dipole Field

Twenty paired 14C and U/Th dates covering most of the past 50,000 yr have been obtained on a stalagmite from the Cango Caves in South Africa as well as some additional age-pairs on two stalagmites from Tasmania that partially fill a gap between 7 ka and 17 ka ago. After allowance is made for the initial apparent 14C ages, the age-pairs between 7 ka and 20 ka show satisfactory agreement with the coral data of Bard et al. (1990, 1993). The results for the Cango stalagmite between 25 ka and 50 ka show the 14C dates to be substantially younger than the U/Th dates except at 49 ka and 29 ka, where near correspondence occurs. The discrepancies may be explained by variations in 14C production caused by changes in the magnetic dipole field of the Earth. A tentative calibration curve for this period is offered.

Kinematic Model of a Magnetic-Microrobot Swarm in a Rotating Magnetic Dipole Field

2020 ◽  
Vol 5 (2) ◽  
pp. 2419-2426 ◽  
Author(s):  
BhanuKiran Chaluvadi ◽  
Kristen M. Stewart ◽  
Adam J. Sperry ◽  
Henry C. Fu ◽  
Jake J. Abbott
Keyword(s):  
Magnetic Dipole ◽  
Kinematic Model ◽  
Dipole Field ◽  
Magnetic Dipole Field

Photoproduction of gravitons in a static magnetic dipole field due to currents

1978 ◽  
Vol 56 (6) ◽  
pp. 801-805 ◽  
Author(s):  
G. Papini ◽  
S. R. Valluri
Keyword(s):  
Gravitational Field ◽  
Magnetic Dipole ◽  
Cross Section ◽  
Dipole Field ◽  
Radiative Corrections ◽  
Gauge Invariant ◽  
Magnetic Dipole Field ◽  
The Cross

The cross section for the photoproduction of gravitons in magnetic dipole fields which are due to steady currents is calculated. The approach and the results are compared with the previously studied case in which no currents exist and the potential is represented by a scalar. The calculations in both cases are completely covariant and electromagnetically gauge invariant. The radiative corrections to order [Formula: see text] and [Formula: see text] in the nonrelativistic and relativistic limits are also calculated for dipole and Coulomb fields, respectively. Their evaluation is particularly simple in the transverse traceless gauge for the gravitational field.

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