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Results for “LOWER IONOSPHERE”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 19 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1962

THE VLF ADMITTANCE OF A DIPOLE IN THE LOWER IONOSPHERE

The admittance of a dipole in the lower ionosphere has been calculated for very low frequencies. Both the real and reactive parts of the admittance are found to be related to the ion sheath which forms about the dipole and are functions of electron density and temperature of the ionosphere. An electron density profile is estimated based upon measurements reported in an earlier rocket flight.

DIPOLE↗
NASA NTRS1966

Lower ionosphere at solar minimum.

Lower ionosphere measurements at solar minimum, discussing positive ion density, electron density, solar radiation optical depth, etc

IONOSPHERIC ION DENSITY↗
NASA NTRS1968

The lower ionosphere of Mars.

Mars lower ionosphere ionization from spectroscopic and Mariner 4 occultation data, discussing various ionization sources

Aikin, A. C.↗
NASA NTRS1980

Microwave heating of the lower ionosphere

Changes in the properties of the lower ionosphere due to ohmic heating of the plasma by the solar power satellite (SPS) microwave power beam are considered. The development of a predictive model of the underdense interaction of an electromagnetic beam and the lower ionosphere is described. The extent to which the Platteville and Arecibo experiments simulate SPS conditions is considered.

Meltz, G.↗
NASA NTRS1984

Winter Anomaly of the Lower Ionosphere and Its Possible Causes

It is a well-known fact that in winter the midlatitude lower ionosphere differs considerably from that in summer. Attempts to explain the possible causes of the winter anomaly in the lower ionosphere were made. Integrated ground-based and rocket experiments were performed in the USSR. The rockets M-100B launched in Volgograd (psi = 48.7 deg N; lambda = 44.3 deg E; psi = 43.1 deg) provided weight profiles of electron density, wind and temperature. Radio wave absorption data obtained by a I method in Volgograd and F sub min parameters values obtained at a number of Soviet ionosone stations were used to determine the situation in the lower ionosphere. It was found that a correct interpretation of the midlatitude winter radio wave absorption changes is possible only if the whole spatial-time pattern of the event is taken into account.

Rapoport, Z. T.↗
NASA NTRS1989

The 27-day versus 13.5-day variations in the solar Lyman-alpha radiation and the radio wave absorption in the lower ionosphere over Europe

In order to clarify the question of solar periods in absorption, the pattern was studied of the solar Lyman-alpha radiation (the principal ionizing agent of the lower ionosphere) and of the radio wave absorption at five widely spaced places in Europe. When the solar Lyman-alpha flux variability is very well developed, then it dominates in the lower ionospheric variability. The most pronounced Lyman-alpha variation on time scale day-month is the solar rotation variation (about 27 days). When the Lyman-alpha variability is developed rather poorly, as it is typical for periods dominated by the 13.5 day variability, then the lower ionospheric variability appears to be dominated by variations of meteorological origin. The conclusions hold for all five widely spaced placed in Europe.

Delamorena, B. A.↗