Derivation Of A Self Consistent Auroral Oval Model Using The Auroral Boundary Index PDF Download
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Author | : Keith A. Anderson |
Publisher | : |
Total Pages | : 110 |
Release | : 2004-06-01 |
Genre | : Auroras |
ISBN | : 9781423519201 |
Download Derivation of a Self-Consistent Auroral Oval Model Using the Auroral Boundary Index Book in PDF, ePub and Kindle
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 | : D. Madden |
Publisher | : |
Total Pages | : 46 |
Release | : 1990 |
Genre | : Artificial satellites |
ISBN | : |
Download Auroral Boundary Index from 1983 to 1990 Book in PDF, ePub and Kindle
Since all plots of boundaries that made their way to the public before 1988 used the 'orginal' criteria, both 'original' and 'modified' criteria will be explained auroral oval, central plasma sheet, electron precipitation boundaries, Defense Meteorological Satellite Program--Abstract/Keywords.
Author | : B. S. Dandekar |
Publisher | : |
Total Pages | : 48 |
Release | : 1979 |
Genre | : Airglow |
ISBN | : |
Download Study of the Equatorward Edge of the Auroral Oval from Satellite Observations Book in PDF, ePub and Kindle
The auroral ovals in the northern and southern hemispheres observed by the optical instruments aboard the DMSP satellites are studied on a statistical basis in terms of the temporal, spatial, and magnetic activity dependence of the equatorward edge of the diffuse (continuous) aurora. In the nightside (18-08 CGT), the equatorward edges of the auroral ovals are located predominantly in the latitude range 61 deg - 69 deg CGL. They show strong dependence on the levels of magnetic activity. Of the indices Kp, AE, Dst, and Q, the Q index is correlated best with the position of the equatorward edge of the diffuse aurora. Assuming that the auroral oval is approximately circular in a CG coordinate system, the dependence of the radius of the auroral oval on magnetic activity is determined. The radius and the center of the auroral circle changes with variation in magnetic activity. The ovals of the northern and southern hemispheres consistently show an asymmetry. On the nightside, the oval in the southern hemisphere is located about 1 deg closer to the equator than the oval in the northern hemisphere.
Author | : B. S. Dandekar |
Publisher | : |
Total Pages | : 36 |
Release | : 1993 |
Genre | : Geomagnetic indexes |
ISBN | : |
Download Determination of the Auroral Oval Q Index from the Air Weather Service K Index Book in PDF, ePub and Kindle
Author | : D. Madden |
Publisher | : |
Total Pages | : 0 |
Release | : 1990 |
Genre | : Artificial satellites |
ISBN | : |
Download Auroral Boundary Index from 1983 to 1990 Book in PDF, ePub and Kindle
Since all plots of boundaries that made their way to the public before 1988 used the 'original' criteria, both 'original' and 'modified' criteria will be explained auroral oval, central plasma sheet, electron precipitation boundaries, Defense Meteorological Satellite Program--Abstract/Keywords.
Author | : Charles R. Chappell |
Publisher | : John Wiley & Sons |
Total Pages | : 417 |
Release | : 2016-09-23 |
Genre | : Science |
ISBN | : 1119066875 |
Download Magnetosphere-Ionosphere Coupling in the Solar System Book in PDF, ePub and Kindle
Over a half century of exploration of the Earth’s space environment, it has become evident that the interaction between the ionosphere and the magnetosphere plays a dominant role in the evolution and dynamics of magnetospheric plasmas and fields. Interestingly, it was recently discovered that this same interaction is of fundamental importance at other planets and moons throughout the solar system. Based on papers presented at an interdisciplinary AGU Chapman Conference at Yosemite National Park in February 2014, this volume provides an intellectual and visual journey through our exploration and discovery of the paradigm-changing role that the ionosphere plays in determining the filling and dynamics of Earth and planetary environments. The 2014 Chapman conference marks the 40th anniversary of the initial magnetosphere-ionosphere coupling conference at Yosemite in 1974, and thus gives a four decade perspective of the progress of space science research in understanding these fundamental coupling processes. Digital video links to an online archive containing both the 1974 and 2014 meetings are presented throughout this volume for use as an historical resource by the international heliophysics and planetary science communities. Topics covered in this volume include: Ionosphere as a source of magnetospheric plasma Effects of the low energy ionospheric plasma on the stability and creation of the more energetic plasmas The unified global modeling of the ionosphere and magnetosphere at the Earth and other planets New knowledge of these coupled interactions for heliophysicists and planetary scientists, with a cross-disciplinary approach involving advanced measurement and modeling techniques Magnetosphere-Ionosphere Coupling in the Solar System is a valuable resource for researchers in the fields of space and planetary science, atmospheric science, space physics, astronomy, and geophysics. Read an interview with the editors to find out more: https://eos.org/editors-vox/filling-earths-space-environment-from-the-sun-or-the-earth
Author | : |
Publisher | : |
Total Pages | : 1572 |
Release | : 1992 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 1982 |
Genre | : Atmospheric electricity |
ISBN | : |
Download 1978 Diffuse Auroral Boundaries and a Derived Auroral Boundary Index Book in PDF, ePub and Kindle
DMSP/F2 and F4 precipitating electron data are used to determine statistically the systematic variations of the equatorward boundary with Kp as a function of local time. The boundaries were chosen by hand for every DMSP/F2 satellite pass in 1978. These in turn are used to assess an algorithm developed to choose the boundaries automatically. From the statistical variations each boundary is projected to a midnight boundary. The projected midnight boundary served as an index of auroral activity-the Auroral Boundary Index. Listing of the 1978 hand- and computer-chosen boundaries and the Auroral Boundary Index for 1978 are included in appendices.
Author | : Qilong Min |
Publisher | : |
Total Pages | : 240 |
Release | : 1993 |
Genre | : Auroras |
ISBN | : |
Download A Self-consistent Time Varying Auroral Model Book in PDF, ePub and Kindle
Author | : Yohsuke Kamide |
Publisher | : Springer Science & Business Media |
Total Pages | : 539 |
Release | : 2007-08-02 |
Genre | : Science |
ISBN | : 3540463143 |
Download Handbook of the Solar-Terrestrial Environment Book in PDF, ePub and Kindle
As a star in the universe, the Sun is constantly releas- cover a wide range of time and spatial scales, making ?? ing energy into space, as much as ?. ? ?? erg/s. Tis observations in the solar-terrestrial environment c- energy emission basically consists of three modes. Te plicated and the understanding of processes di?cult. ?rst mode of solar energy is the so-called blackbody ra- In the early days, the phenomena in each plasma diation, commonly known as sunlight, and the second region were studied separately, but with the progress mode of solar electromagnetic emission, such as X rays of research, we realized the importance of treating and UV radiation, is mostly absorbed above the Earth’s the whole chain of processes as an entity because of stratosphere. Te third mode of solar energy emission is strong interactions between various regions within in the form of particles having a wide range of energies the solar-terrestrial system. On the basis of extensive from less than ? keV to more than ? GeV. It is convenient satellite observations and computer simulations over to group these particles into lower-energy particles and thepasttwo decades, it hasbecomepossibleto analyze higher-energy particles, which are referred to as the so- speci?cally the close coupling of di?erent regions in the lar wind and solar cosmic rays, respectively. solar-terrestrial environment.