The ONR-602 Experiment and Investigation of Particle Precipitation Near the Equator.

Miah, M. A.

doi:10.5636/jgg.43.445

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…s(α e ) ~ 1.38 -0.32(sinα e + √sinα e ) (11) and dl* = dl/cosα = r o s(α e ) (12) Within 0 ≤ α e ≤ π/2, the bounce period varies less than a factor of 2. The spiral length dl* and the field arc length dl and the local pitch angle α are related by Eqn.…”

Section: Proton Survival From Ionization Lossmentioning

confidence: 99%

Fifth-Power Altitude Dependence of Particle Precipitation at The Minimum Geomagnetic Field Position

2015

American Research Journal of Physics

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The fifth power altitude dependence of magnetospheric particle precipitation near the geomagnetic equator in the altitude range of 160 to 300 km during moderate geomagnetic conditions has been explained. In the atmosphere, the observed altitude dependence of proton flux can be due to a number of factors such as (i) source attenuation, (ii) charge exchange loss of protons, (iii) proton loss due to atmospheric ionization, and (iv) proton loss due to pitch angle diffusion in the loss cone. Each of these causes has been discussed to estimate the importance in the explanation of the observed proton flux variation with altitude

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Section: Proton Survival From Ionization Lossmentioning

confidence: 99%

Fifth-Power Altitude Dependence of Particle Precipitation at The Minimum Geomagnetic Field Position

2015

American Research Journal of Physics

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“…The detector dimensions used in this study pertains ONR-602 experiment (Miah, 1991a). As said above, Eq.…”

Section: Response Functionmentioning

confidence: 99%

Absolute Flux Comparison of Magnetospheric Particles

Adel¹

2012

Physics International

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Problem statement: The calculation of magnetospheric particle flux by dividing the particle count rate by the instrument geometric factor does not take into account the anisotropic pitch angle distribution function. A comparison of particle fluxes measured by different instruments fail to lead to the right comparison. To circumvent the omission of anisotropy of the pitch angle distribution and to make the correct comparison of particle fluxes, the instrument response function to different pitch angles within the sampling range of the instrument has been incorporated into the count rates over a certain readout time. Conclusion/Recommendations: A quantity in absolute comparison of magnetospheric particle flux has been found. The newly defined quantity of different observations does lead to the correct comparison for studying temporal variations. Investigators interested to study temporal features of magnetospheric particles over epochs may find the response functions for different instruments flown at different epochs useful for their study.

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“…The orbital information of the satellite, the detector geometry and the detector dimensions used in this work pertain to ONR-Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB. 602 experiment (Miah, 1991a). In the exploration of planetary magnetosphere, knowledge of detector response function is required to calculate the particle flux characterized by anisotropic pitch angle distribution.…”

Section: Introductionmentioning

confidence: 99%

A detector telescope’s pitch angle sampling of magnetospheric particles

Adel

2008

Earth Planet Sp

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A geometrical method developed for a particle detector can be extended for application to the determination of the pitch angle sampling capability of the particle telescope of any orientation and for the parent satellite of any orbital orientation. A unit vector tangent to a dipole geomagnetic field line has been calculated from the dipole magnetic field equations in the geomagnetic coordinate system. Rotation matrices have been used, step-by-step, to align the geomagnetic coordinate frame with the detector coordinate frame. The detector selected in this work has its axis tilted with the local zenith direction. The component of the unit vector in the detector coordinate system is found at an observation point characterized by longitude, latitude, and the geocentric radial distance. Pitch angles are measured with respect to the guiding field direction. The pitch angle sampling factor is used in the calculation of detector response functions to particles of different pitch angles. The sampling efficiency functions are useful to make an absolute comparison of magnetospheric particle fluxes measured by particle telescopes under different solar conditions pertaining to different epochs.

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The ONR-602 Experiment and Investigation of Particle Precipitation Near the Equator.

Abstract: The ONR-602 experiment on board the S81-1 US Air Force mission was used, as one from other zones, and subsequent analysis show that ML rates were almost entirely due to protons. 1.

Cited by 7 publications

References 5 publications

Fifth-Power Altitude Dependence of Particle Precipitation at The Minimum Geomagnetic Field Position

Fifth-Power Altitude Dependence of Particle Precipitation at The Minimum Geomagnetic Field Position

Absolute Flux Comparison of Magnetospheric Particles

A detector telescope’s pitch angle sampling of magnetospheric particles

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