![]() ![]() Reliance of human life on space assets issignicantlyshorter,nomorethan40years.Thereisnoobjective,orgenerallyaccepted,waytodetermine the one in 100 years event (Riley et al., 2018). It has been used to characterize the size and intensity of a geomagnetic storm. #Omniweb nasa dst index driversWe approximate the tails of distribution functions of all storms and storms separately induced by four various drivers in the Dst range with large number of storms (−50 to −200 nT) and then extrapolate the approximating function in the range of extreme storms. Here we used the hourly averaged Dst index, AE index, solar wind ion density, flow speed, and B Z component of the IMF data from the year 1997 to the year 2007 as extracted from NASA/GSFCs (Goddard Space Flight Center) OMNI data set through OMNIWeb (King & Papitashvili, 2005). However, the Dst index is produced continuously only since 1957. The disturbance storm time (Dst) index is an important and useful measurement in space weather research. On the basis of the OMNI database, we identify the interplanetary drivers of magnetic storms as interplanetary coronal mass ejections (CMEs) (also interplanetary CMEs (ICMEs) including magnetic cloud (MC) and Ejecta), compression regions Sheath before fast ICMEs, and the co-rotating interaction region (CIR) before high-speed streams of solar wind. The Omni data set represents a thorough description of various characteristics of near-Earth solar wind magnetic field and plasma, which could be used as a basis for that space environment's standard.We study the large-scale phenomena of solar wind (SW), its source on the Sun, and its capability of generating magnetic storms on Earth. On these for- mats, several retrieval and visualisation tools have been built, such as OMNIWeb, CDAWeb, PAPCO, SDDAS. #Omniweb nasa dst index downloadtime, to create scatter plots of any two OMNI parameters, to filter with user-specified parameter range criteria, to list and download OMNI parameters, to generate distributions of OMNI parameter values, and to browse and retrieve a static (but periodically updated) daily-resolution IMF polarity plot covering the entire OMNI time span. OMNIWeb allows users to generate plots vs. We will also present some of the many capabilities of the OMNIweb interface () that provides access to the entire OMNI data set. This presentation will describe the OMNI data set and highlight its wide use in the space science community. Extensive quality control and cross- comparisons of overlapping data sets were made in creating OMNI. The data from ISEE-3, Wind, and ACE were time-shifted because they are about an hour upstream of the Earth's magnetosphere. Spacecraft data used for compiling the OMNI solar wind reference include IMP-8, ACE, Wind, ISEE-3, and Geotail. OMNI provides the IMF (magnitude and vector), flow velocity (magnitude and vector), flow pressure, proton density, alpha particle to proton density ratio, and several additional parameters including sunspot and geomagnetic indices and energetic proton fluxes from IMP and GOES. OMNI is widely used in the heliospheric community as is documented by the large number of acknowledgements in scientific papers. Hourly resolution data of two geomagnetic indices, the Disturbance storm time index (Dst) and one of the Planetary indices (Ap), from the OMNIWeb ( are considered during the passage of HSS detected in 2009-2016. OMNI is an hourly resolution multi-source data set of near-Earth solar wind's magnetic field and plasma parameters spanning the period from November 1963 (IMP 1 launch) to today, and it is being updated regularly with new data. ![]()
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