Download or read book Equatorial Spread F In Situ Measurements of Electron Density Temperature and Density Fluctuation Power Spectra written by E. P. Szuszczewicz and published by . This book was released on 1980 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NRL pulsed plasma probe experiment was successfully flown on each of the two PLUMEX rockets during July 1979. The experiment provided direct measurements of absolute density N(e), temperature T(e) and density fluctuation power spectra with a maximum Nyquist frequency of 1 KHz (1 meter resolution at a 1 km/sec rocket velocity). In the first operation, a number of major depletions were distributed throughout the F-region, from its bottomside gradient centered near 260 km, through the F-peak, to a topside altitude of 500 km. The F-peak was at 375 km, with N(e)(Max) = 1/1,300,000 cc (+ or - 10%). The electron energy distribution was characterized by T(e) = 1350 (+ or - 250)K with no obvious signature of energy redistribution in and around the depletions. The most intense 'in situ' irregularities occurred on the bottomside ledge where gradient scale lengths were found to vary between 2 and 25 km. The power spectral density in this region of intense irregularities on the bottomside was dominated by a k( -2.5) power law over the intermediate wavelength domain k = 2pi/1 km to k = 2pi/2.5 m. This result supports the role of the collisional Rayleigh-Taylor instability in generating intermediate wavelength irregularities during the occurrence of equatorial spread-F.

Download or read book On the Hierarchy of Processes Contributing to Equatorial Spread F written by David Lee Hysell and published by . This book was released on 1992 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1987 with total page 1284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1979 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aspects of the Linear and Nonlinear Development of Equatorial Spread F with Application to Ionospheric Scintillation written by Emanoel Paiva de Oliveira Costa and published by . This book was released on 1978 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Equatorial Spread F Dependence on Altitude of the F Peak and Bottomside Background Electron Density Gradient Scale Length written by S. L. Ossakow and published by . This book was released on 1978 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four different two dimensional (perpendicular to the ambient magnetic field), plasma fluid-type, numerical simulations following the nonlinear evolution of the collisional Rayleigh-Taylor instability in the nighttime equatorial F region ionosphere have been performed. Realistic altitude dependent ion-neutral collision frequencies, recombination rates, and ambient electron density profiles were used. In three cases (ESF 0, 1, 3) the electron density profile was kept constant, with a minimum bottomside background electron density gradient scale length L about 10 km, but the altitude of the F peak was changed, with F peak altitudes at 340, 350, and 430 km. All cases resulted in bottomside growth of the instability (Spread F) with dramatically different time scales for development. Plasma density depletions were produced on the bottomside with rise velocities, produced by nonlinear polarization E x B forces, of 2.5, 12, and 160 m/sec, and percentage depletions of 16, 40, and 85, respectively. High altitude of the F peak, small bottomside electron density gradient scale lengths, and large percentage depletions yield large vertical bubble rise velocities, with the first two conditions favoring bottomside linear growth of the instability. The numerical simulation results are in good agreement with rocket and satellite in situ measurements and radar backscatter measurements, including some of the recent results from the August 1977 coordinated ground based measurement campaign conducted by DNA at Kwajalein.

Download or read book The Orbiting Geophysical Observatories written by John Edmond Jackson and published by . This book was released on 1978 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Model of Equatorial Scintillations from in Situ Measurements written by Sunanda Basu and published by . This book was released on 1976 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In situ measurements of F-region irregularity amplitude and ambient electron density made by the retarding potential analyzer (RPA) on OGO-6 near perigee altitude of 400 km have been utilized to derive the variation of electron density deviation over the equatorial region. Based on these measured electron density deviations and other assumed model parameters, including a three-dimensional power-law form of irregularity spectrum of index 4, a model of equatorial scintillations is developed in the framework of diffraction theory. The percentage occurrence contours of estimated equatorial scintillations greater than or equal to 4.5 dB at 140 MHz during 1900 to 2300 LMT for the period November to December 1969 and 1970 have been derived. The model is found to depict a pronounced longitude variation with the scintillation belt width and percentage occurrence being maximum over the African sector. The latitude extent of the spatial scintillation belt narrows over the American sector without much decrease in the scintillation occurrence whereas over the Indian and Far Eastern sectors both the extent and the occurrence are found to decrease. The percentage occurrence of scintillations estimated from this model is found to be consistent with VHF scintillation measurements at Ghana, Huancayo, and Calcutta. In addition, the model was found to be in qualitative agreement with GHz observations at various longitudes made by the COMSAT group. The effect of varying model parameters on scintillation estimates at VHF, UHF and GHz are discussed. Implications of the observed longitudinal variation of scintillations on current theories of equatorial irregularity formation are indicated. (Author)

Download or read book Proceedings of the International Beacon Satellite Symposium 1990 written by and published by . This book was released on 1990 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1992 with total page 1066 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1997 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Incoherent Scatter Measurements and Inferred Energy Fluxes in the Equatorial F region Ionosphere written by Joseph Ellsworth Pingree and published by . This book was released on 1990 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Description of the Low Latitude and Equatorial Ionosphere in the International Reference Ionosphere written by Karl Rawer and published by . This book was released on 2003 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Remote Sensing of the Atmosphere and Ionosphere Transition Between Science Models and International Standard Models written by Kohichiro Oyama and published by . This book was released on 2008 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: