Results 171 to 180 of about 4,065 (195)
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Diurnal variation and Forbush decrease
Il Nuovo Cimento, 1961In this work we discuss the depressions often preceding the most important Forbush decreases by less than 24 h, and certain features of a Forbush decrease such as the rarity of onsets during morning hours, the greater amplitude when they happen during the evening as well as the small increases that sometimes happen during the main decrease.
D. Cattani, M. Galli, P. Randi
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Interplanetary disturbances during Forbush decreases
Il Nuovo Cimento C, 1984The interplanetary perturbations associated with Forbush decreases (FDs) during the period 1965–1974 are studied. The systematic appearance of the results obtained confirms once again that type-IV solar flares are the origin of these perturbations. The front perturbation is a wide (∼100° in longitude) driven shock followed by a magnetic blob and a high-
N. Iucci +3 more
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Publications of the Astronomical Society of Australia, 1968
Ground level detectors observed several major changes in the primary cosmic-ray flux during November 4960. Large increases, of solar origin, occurred on November 12 and 15, and a smaller one on November 20. The galactic flux in the region of the Earth was severely reduced by a Forbush decrease on November 12, and remained notably depressed until ...
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Ground level detectors observed several major changes in the primary cosmic-ray flux during November 4960. Large increases, of solar origin, occurred on November 12 and 15, and a smaller one on November 20. The galactic flux in the region of the Earth was severely reduced by a Forbush decrease on November 12, and remained notably depressed until ...
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Observing Forbush decreases in cloud atShetland
Journal of Atmospheric and Solar-Terrestrial Physics, 2010Abstract Meteorological measurements from Lerwick Observatory, Shetland (60°09′N, 1°08′W), are compared with short-term changes in Climax neutron counter cosmic ray measurements. For transient neutron count reductions of 10–12%, broken cloud becomes at least 10% more frequent on the neutron minimum day, above expectations from sampling. This suggests
R. Giles Harrison, Maarten H.P. Ambaum
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Forbush decreases and interplanetary disturbances
Il Nuovo Cimento B, 1973The correlation between perturbations of the interplanetary medium and Forbush decrease events is studied by using interplanetary-magnetic-field and cosmic-ray data for the period March to November 1968, with the purpose of investigating the particular mechanism responsible for this type of modulation of the cosmic-ray intensity.
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Forbush decreases and geomagnetic storms
Geomagnetizm i aèronomiâForbush decreases in galactic cosmic rays (according to data from a network of neutron monitors) and accompanying geomagnetic disturbances over a long period from 1957 to 2022 have been identified and studied. Statistical relationships between various parameters of cosmic ray flux and geomagnetic activity indices are analyzed.
A. V. Belov +5 more
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Flares, Forbush decreases, and geomagnetic storms
Journal of Geophysical Research, 1969Geomagnetic storms and Forbush decreases accounted for by interplanetary solar corpuscular streams effects described by interplanetary magnetic field structure, noting independence of ...
J. R. Ballif, D. E. Jones
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Forbush decreases in the cosmic radiation
Space Science Reviews, 1971The experimental observations of Forbush decreases in recent years are reviewed and related to different theoretical models which have been proposed. The observational data from both ground-based and spacecraft experiments were selected to illustrate the important characteristics of Forbush decreases.
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Forbush Decreases and Cloud Cover
2005According to the cosmic ray cloud hypothesis, changes in the cosmic ray intensity over the past two and a half solar cycles caused significant changes in the Earth's cloud cover with important consequences for the climate. To test this hypothesis we investigated on a global scale the atmospheric cloud cover and the variation of the atmospheric ...
Čalogović, Jaša +3 more
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Journal of Geophysical Research, 1963
Intensity increases or decreases, which are sometimes a strong function of longitude, are frequently found superimposed on the normal behavior of the cosmic-ray intensity during Forbush decreases. A study has been made of these effects utilizing the neutron monitor data from many stations distributed in latitude and longitude. The anisotropies recorded
J. A. Lockwood, H. Razdan
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Intensity increases or decreases, which are sometimes a strong function of longitude, are frequently found superimposed on the normal behavior of the cosmic-ray intensity during Forbush decreases. A study has been made of these effects utilizing the neutron monitor data from many stations distributed in latitude and longitude. The anisotropies recorded
J. A. Lockwood, H. Razdan
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