SEARCH · Search NASA
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Irradiation damage of drift-field solar cells by low energy protons - computer analysis of current-voltage and spectral response data
Irradiation damage of drift-field solar cells by low energy protons - calibration of irradiation apparatus and monitoring equipment
Low energy proton damage to drift field solar cells
Determination of maximum force on static sheet of aluminum subjected to magnetic field of hammer coil
Flow field produced by three hypersonic jets impinging on surface in vacuum environment
Silicon solar cell with drift fields of various widths and magnitudes, considering performance changes before and after radiation
Variations in magnetic field in lunar wake determined by solving Maxwell equations for steady state solutions
Cesium ion beam electric field measuring instruments
Plasma shadow formation on dark side of moon, using solar wind-moon interaction model
Magnetic field perturbations in lunar wake formed by dark side plasma shadow region due to solar wind interaction with moon
Rotating spectral and spatial sound pressure distribution in propeller duct calculated on basis of propulsion quantities, noting effect of tip clearance
Noise spectra in nuclear rocket engine ground test
Convection electric fields observed with double probe dc electric field experiment on Explorer 40 satellite
Calculation of near fields of reflector antennas by geometrical theory of diffraction
The qualitative properties of an open magnetosphere and its electric field are examined and compared to a simple model of a dipole in a constant field and to actual observations. Many of these properties are found to depend on the separatrix, a curve connecting neutral points and separating different field-line regimes. In the simple model, the electric field in the central polar cap tends to point from dawn to dusk for a wide choice of external fields. Near the boundary of the polar cap electric equipotentials curve and become crescent-shaped, which may explain the correlation of polar magnetic variations with the azimuthal component of the interplanetary magnetic field, reported by Svalgaard. Modifications expected to occur in the actual magnetosphere are also investigated: in particular, it appears that bending of equipotentials may be reduced by cross-field flow during the merging of field lines and that open field lines connected to the polar caps emerge from a long and narrow slot extending along the tail.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Using the Caltech videomagnetograph, we obtained a 6.5-hr movie of the magnetic fields in a young active region. The major contribution to the short term magnetic evolution of the region was provided by many discrete magnetic points which move in apparently random directions with typical velocities of 0.4 - 1.0 km/sec. The majority of these features appear to be footpoints of new EFR's, which emerge at an observed rate of one to two per hour. The pattern of the motions suggests that the magnetic evolution of a growing region cannot be principally due to photospheric convective cells.