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Author : B. S. Dandekar
Publisher : Unknown
Page : 36 pages
File Size : 44,9 Mb
Release : 1993
Category : Geomagnetic indexes
ISBN : UCSD:31822009584558
Author : Anonim
Publisher : Unknown
Page : 42 pages
File Size : 53,7 Mb
Release : 1993
Category : Environmental geology
ISBN : CHI:46761246
Author : Anonim
Publisher : Unknown
Page : 300 pages
File Size : 47,8 Mb
Release : 1995
Category : Aeronautics
ISBN : MINN:30000011064585
Author : B. S. Dandekar
Publisher : Unknown
Page : 110 pages
File Size : 49,9 Mb
Release : 1996
Category : Ionospheric radio wave propagation
ISBN : UCSD:31822009261983
Author : Anonim
Publisher : Unknown
Page : 1686 pages
File Size : 52,6 Mb
Release : 1995
Category : Research
ISBN : UOM:39015057164157
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Author : Anonim
Publisher : Unknown
Page : 1140 pages
File Size : 49,7 Mb
Release : 1994
Category : Science
ISBN : MSU:31293011225350
Author : B. S. Dandekar
Publisher : Unknown
Page : 40 pages
File Size : 50,7 Mb
Release : 1982
Category : Auroras
ISBN : UOM:39015095143619
The K index determined by the Air Force Global Weather Central has been compared with Kp and Q (from Sodankyla) for the period March 1978 - May 1981 to determine empirical relations between Kp vs K, Q vs Kp, and Q vs K. The study shows that the K index is a reasonably good measure of Kp during most of the time. The time-dependent relations between Q and K, and Kp and K are derived, so that one can convert the K (AFGWC) index to the Kp or Q index for specification of the auroral ionosphere in the Experimental Radar System test region.
Author : David A. Hardy
Publisher : Unknown
Page : 42 pages
File Size : 43,5 Mb
Release : 1980
Category : Algorithms
ISBN : UOM:39015095139450
In support of the Global Weather Central of the Air Weather Service, we have developed computer techniques to determine, in near real time, the equatorward boundary of the auroral oval using the data from the SSJ/3 sensors flown on board the DMSP satellites. The boundary is determined on both the morning and evening sides of the oval and in both northern and southern auroral zones. Three tests are used in the boundary determination, one on the evening side and two on the morning side of the auroral oval. On the evening side of the auroral zone, since low energy particles always are observed at the lowest latitude, the boundary is determined by testing the summed counts in the six channels of the SSJ/3 detector covering the energy range from 110 eV to 1000 eV. The boundary is chosen when the summed counts exceed 30 for 3 successive seconds. The data are always tested as a function of increasing magnetic latitude. On the morning side, high energy electrons are always observed first. Since the channels measuring high energy electrons may be contaminated by penetrating particles from the ring belts, two tests are required. The first test picks the boundary at the point where three successive ratios of 4-sec averages of channel 8 to channel 9 are less than 5. The second test chooses the boundary where the ratio of the summed counts in channels 1 through 4 of the SSJ/3 sensor to channels 5 through 8 exceeds 1.5 or is less than 0.5 for 3 successive seconds.
Author : Keith A. Anderson
Publisher : Unknown
Page : 110 pages
File Size : 54,9 Mb
Release : 2004-06-01
Category : Auroras
ISBN : 1423519205
The position and intensity of the auroral oval has many implications for the Air Force from determining the effects of incoming electron flux on DoD systems to modeling the ionosphere to exploit current HF communications capabilities. The auroral morphology is a good indicator of the level at which space weather and its near-Earth consequences are occurring, and thus it is important to develop an auroral prediction model. However, since no purely physics-based models exist to describe the temporal and spatial evolution of the auroral zone, space weather practitioners and researchers are forced to produce statistical representations, "organized" by some relevant geophysical parameter. Currently, the most widely used model is the Hardy et al. (1985) auroral oval model, which is binned according to the Kp index. The Kp index is a mid-Iatitude measure of planetary geomagnetic activity, and was presumed to be well- correlated to the size and shape of the auroral region. However, subsequent research has shown that Kp is probably not the best binning parameter. This study used the Auroral Boundary Index (ABI) to parameterize the statistics of the auroral oval location since it is a measurement of the electron fluxes computed directly from sensors aboard the DMSP satellites. Thus, the current work represents a move toward a more self- consistent-and presumably more accurate-climatological representation of the auroral oval boundaries. This was accomplished by recreating the process performed by Hardy et al., substituting the ABI for the Kp index and deriving an entirely new set of auroral ovals based on almost 11 years ofDMSP data from the F8 and F9 satellites. To quantitatively assess the differences between the two models, electron flux values were compared to actual DMSP data of individual satellite passes. Preliminary findings suggest that the new ABI auroral ov
Author : Anonim
Publisher : Unknown
Page : 1016 pages
File Size : 40,9 Mb
Release : 1982
Category : Government reports announcements & index
ISBN : MINN:319510006566613
Author : Götz Paschmann,Stein Haaland,Rudolf Treumann
Publisher : Springer Science & Business Media
Page : 494 pages
File Size : 55,6 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789400710863
This volume gives a broad synthesis of the current knowledge and understanding of the plasma physics behind the aurora. The aurora is not only one of the most spectacular natural phenomena on Earth, but the underlying physical processes are expected to be ubiquitous in the plasma universe. Recognizing the enormous progress made over the last decade) through in situ and groundbased measurements as well as theoretical modelling, it seemed timely to write the first comprehensive and integrated book on the subject. Recent advances concern the clarification of the nature of the acceleration process of the electrons that are responsible for the visible aurora, the recognition of the fundamental role of the large-scale current systems in organizing the auroral morphology, and of the interplay between particles and electromagnetic fields.
Author : National Research Council,Division on Engineering and Physical Sciences,Space Studies Board,Committee on the Societal and Economic Impacts of Severe Space Weather Events: A Workshop
Publisher : National Academies Press
Page : 144 pages
File Size : 46,5 Mb
Release : 2008-12-17
Category : Science
ISBN : 9780309141536
The adverse effects of extreme space weather on modern technology-power grid outages, high-frequency communication blackouts, spacecraft anomalies-are well known and well documented, and the physical processes underlying space weather are also generally well understood. Less well documented and understood, however, are the potential economic and societal impacts of the disruption of critical technological systems by severe space weather. As a first step toward determining the socioeconomic impacts of extreme space weather events and addressing the questions of space weather risk assessment and management, a public workshop was held in May 2008. The workshop brought together representatives of industry, the government, and academia to consider both direct and collateral effects of severe space weather events, the current state of the space weather services infrastructure in the United States, the needs of users of space weather data and services, and the ramifications of future technological developments for contemporary society's vulnerability to space weather. The workshop concluded with a discussion of un- or underexplored topics that would yield the greatest benefits in space weather risk management.
Author : T. E. Van Zandt
Publisher : Unknown
Page : 166 pages
File Size : 45,7 Mb
Release : 1972
Category : F region
ISBN : MINN:30000010416273
Author : Robert F. Pfaff,Joseph E. Borovsky,David T. Young
Publisher : American Geophysical Union
Page : 350 pages
File Size : 48,5 Mb
Release : 1998-02-04
Category : Science
ISBN : 9780875900858
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 102. Space plasma measurements are conducted in a hostile, remote environment. The art and science of measurements gathered in space depend therefore on unique instrument designs and fabrication methods to an extent perhaps unprecedented in experimental physics. In-situ measurement of space plasmas constitutes an expensive, unforgiving, and highly visible form of scientific endeavor.
Author : Bob Schutz,Byron Tapley,George H. Born
Publisher : Elsevier
Page : 563 pages
File Size : 48,5 Mb
Release : 2004-06-26
Category : Science
ISBN : 9780080541730
Statistical Orbit Determination presents fundmentals of orbit determination--from weighted least squares approaches (Gauss) to today's high-speed computer algorithms that provide accuracy within a few centimeters. Numerous examples and problems are provided to enhance readers' understanding of the material. Covers such topics as coordinate and time systems, square root filters, process noise techniques, and the use of fictitious parameters for absorbing un-modeled and incorrectly modeled forces acting on a satellite. Examples and exercises serve to illustrate the principles throughout each chapter.
