Results 181 to 190 of about 4,065 (195)

Types of interplanetary shocks and forbush decreases

Solar Physics, 1991
Two types of interplanetary shocks have been identified and classified into two groups, those associated with a helium-enhancement and those not associated with any helium-enhancement. The cosmic-ray intensity decreases at Calgary neutron monitor are studied with respect to the arrival time of the two groups of shocks.
null Badruddin, D. Venkatesan, A. G. Ananth   +2 more
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What determines the magnitude of forbush decreases?

Advances in Space Research, 2001
Abstract Cosmic ray Forbush effects (FEs) have been studied for more than 60 years, but even today this phenomenon has no universally accepted definition, which leads to misunderstanding among researchers. There are no complete and convincing answers to the following questions: What are the distinctive features of FEs?
A.V. Belov, E.A. Eroshenko, V.A. Oleneva, A.B. Struminsky, V.G. Yanke   +4 more
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Coronal Mass Ejections and Forbush Decreases

Space Science Reviews, 2000
Coronal Mass Ejections (CMEs) are plasma eruptions from the solar atmosphere involving previously closed field regions which are expelled into the interplanetary medium. Such regions, and the shocks which they may generate, have pronounced effects on cosmic ray densities both locally and at some distance away. These energetic particle effects can often
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Latitude-dependence of a forbush type decrease

Il Nuovo Cimento, 1961
Latitude-dependence of a cosmic ray intensity decrease has been found. It has been shown that the relative amplitude does not flatten beyond the latitude knee. It, rather, goes on increasing even much beyond the knee. It is also seen that the relative amplitude is not symmetrical around the geomagnetic equator.
Lekh Vir, P. S. Gill
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Shock Orientations, Magnetic Turbulence and Forbush Decreases

Solar Physics, 2002
We have studied the effects of quasi-parallel and quasi-perpendicular shocks on the transient modulation of cosmic-ray intensity. Interplanetary magnetic field strength, its variance and solar wind velocity during their passage have also been considered for the analysis in this work.
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Forbush decreases associated to Stealth Coronal Mass Ejections

Central European astrophysical bulletin, 2015
Interplanetary coronal mass ejections (ICMEs) are structures in the solar wind that are the counterparts of coronal mass ejections (CMEs) at the Sun. It is commonly believed that enhanced magnetic fields in interplanetary shocks and solar ejecta as well as the increased turbulence in the solar wind sheath region are the cause of Forbush decreases (FDs)
Vršnak, Bojan, Dumbović, Mateja
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Forbush decreases associated to Stealth CME

2014
Interplanetary coronal mass ejections (ICMEs) are structures in the solar wind that are the counterparts of coronal mass ejections (CMEs) at the Sun. It is commonly believed that enhanced magnetic elds in interplanetary shocks and solar ejecta as well as the increased solar wind speed are the cause of Forbush decreases (FDs) that are intensity ...
Dumbović, Mateja, Vršnak, Bojan
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Forbush decrease model for expanding CMEs (ForbMod)

2018
The Project ForbMod aims to unravel how galactic cosmic rays are influenced by solar storms in the inner solar system (Sun to Mars) by developing a new model and utilizing a number of spacecraft and planetary observation, including those by the Radiation Assessment Detector aboard the Mars Rover Curiosity. The project focuses on Forbush decreases (FDs)
Dumbović, Mateja, Vršnak, Bojan, Kirin, Anamarija   +2 more
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The Forbush Decrease of February 1978

Publications of the Astronomical Society of Australia, 1978
A. G. Fenton, K. B. Fenton, J. E. Humble
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Forbush decrease

2006
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