نتایج جستجو برای: geomagnetic activity
تعداد نتایج: 1139508 فیلتر نتایج به سال:
An attempt has been made to study the influence of geomagnetic storm on the tropospheric acoustic gravity waves at equatorial station, Tirunelveli (8.7°N, 77.8°E), India. The daily average of the amplitude and phase of acoustic gravity waves has been studied for the period 2000-2004. Severe geomagnetic storms occurred during April and September 2000, April 2001, October and November 2003 and No...
The two full precessions in local time completed by the Van Allen Probes enable global specification of the near-equatorial inner magnetosphere plasma environment. Observations by the Helium-Oxygen-Proton-Electron (HOPE) mass spectrometers provide detailed insight into the global spatial distribution of electrons, H+, He+, and O+. Near-equatorial omnidirectional fluxes and abundance ratios at e...
We use recently acquired archival data to extend the IDV-index of long-term 6 geomagnetic activity. The new IDV series (IDV09) includes the years 1835-2009, vs. 7 1872-2004 for IDV05, with improved early data coverage, substantiating our earlier 8 work. Comparison of the IDV09-based HMF strength with other recent reconstructions of 9 solar wind B yields a strong consensus between series based o...
In this paper, a geomagnetic matching navigation method that utilizes the geomagnetic vector is developed, which can greatly improve the matching probability and positioning precision, even when the geomagnetic entropy information in the matching region is small or the geomagnetic contour line's variety is obscure. The vector iterative closest contour point (VICCP) algorithm that is proposed he...
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