Results 201 to 210 of about 13,189 (224)

The Evolution Characteristics of Geomagnetic Disturbances During Geomagnetic Storm

Chinese Journal of Geophysics, 2007
AbstractWith the data of the geomagnetic meridian observatories in China, 25 geomagnetic storms in the period of 1997 to 1999 have been analyzed by using three kinds of methods which are the method of Natural Orthogonal Components (NOC), Correlation analysis and Fourier analysis. Three steps have been adopted to decompose the storm‐time variation (Dst)
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Geomagnetic disturbance effects on equatorial spreadF

Proceedings / Indian Academy of Sciences, 1978
Geomagnetic disturbance effects on the occurrence of range and frequency spread at Huancayo are studied for the period 1957–74. The occurrence of frequency spread is decreased on disturbed days forD-months andE-months while duringJ-months an increase is noted in the post-midnight period.
R G Rastogi, G D Vyas, H Chandra
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Atmospheric temperatures and geomagnetic disturbances

Journal of Geophysical Research, 1967
Although the mechanisms relating atmospheric heating and geomagnetic disturbances still need to be clarified, their positive correlation has been confirmed. In a recent paper Jacchia et al. [1967] reported values for the temperature coefficient, ΔT/ΔKp at high latitudes that were 15–25% greater than at low latitudes for Kpmax 5.
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Geomagnetic disturbances and complex sunspots

Astrophysics and Space Science, 1975
Statistical result shows that a large geomagnetic disturbance is most likely to occur at the time when a complex sunspot is in 6.7° E-19.9° E from the central meridian of the solar disk during the period 1968–1972.
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On ionospheric disturbances in relation to geomagnetic disturbances

Geofisica pura e applicata, 1958
Disturbances in the critical frequency of theF2-region of the ionosphere at Watheroo on international magnetically disturbed days are analyzed together with simultaneous geomagnetic data at the same station. The results show that the daily average disturbanceDm (foF2) becomes negative or positive according as the maximum of the disturbance daily ...
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SURFACE-PRESSURE VARIATIONS FOLLOWING GEOMAGNETICALLY DISTURBED AND GEOMAGNETICALLY QUIET DAYS

Journal of Meteorology, 1952
Abstract The average surface-pressure variations after geomagnetically disturbed and geomagnetically quiet days are studied at various locations in a network covering the northern hemisphere between 30 and 70°N. For the same location and the same period of time, a marked negative correlation between the two average variations exists.
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Variation of geomagnetic disturbance with latitude

Journal of Geophysical Research, 1969
Average geomagnetic storm ranges as function of latitude, noting disturbances caused by ring and ionospheric ...
Kenneth Moe, Dean Nebergall
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Geomagnetic disturbances due to nuclear explosion

Journal of Geophysical Research, 1959
Magnetograms from Honolulu Observatory indicate that nuclear explosions had effects on geomagnetic variation on August 1 anmd 12, 1958. (C.J.G.)
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GEOMAGNETIC FLUCTUATIONS AND DISTURBED BEHAVIOR

The Journal of Nervous and Mental Disease, 1966
A D, Pokorny, R B, Mefferd
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The Most Geomagnetically Disturbed 24 Hours

Studia Geophysica et Geodaetica, 1999
Geomagnetically disturbed periods, characterized by the maximum average 24-hour global disturbances are considered. Gumbel's first asymptotic distribution of extreme values is used to predict the occurrence of major magnetic storm periods. A geomagnetic storm similar to the one recorded on March 13 - 14, 1998, would be expected to occur within the next
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