Longitude distribution of proton flares as a function of recurrence period.
Longitude distribution of solar proton flares as function of recurrence period
SOLAR FLARE↗
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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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The use of resonant satellite orbits to determine longitude variations in the earth's gravity field
Resonant satellite orbits used to determine longitude variations in gravity field of earth
Wagner, C. A.↗
Combined solution for low degree longitude harmonics of gravity from 12 to 24 hour satellites
Combined solution for low degree longitude harmonics of gravity from twelve and twenty-four hour satellites
Wagner, C. A.↗
Intercontinental longitude differences of tracking stations as determined from radio- tracking data.
Longitude differences between tracking stations on different continents determined from spacecraft trajectories
Trask, D. W.↗
Latitude and longitude measurements of Jovian features in 1967-68
Photographic measurements of latitude and longitude of Jovian features
Reese, E. J.↗
A three-month oscillation in the longitude of Jupiter's red spot
Periodic oscillations in longitude of Great Red Spot in Jupiter atmosphere
Solberg, H. G., Jr.↗
Conjugate echoes observed by Alouette 2 topside sounder at the longitudes of Singapore
Ionogram conjugate echoes observed at Singapore longitudes by Alouette 2 topside sounder, attributing sequential occurrence to field-aligned irregularities in magnetosphere
Ramasastry, J.↗
The heliocentric longitude intensity profile of 15-Mev protons from the February 5, 1965, solar flare
Heliocentric longitude intensity profiles of protons associated with solar flare of 5 February 1965, discussing data from Mariner 4 and IMP 2
Ogallagher, J. J.↗
Longitude repositioning of high power communication satellites
Analysis of requirements for longitude repositioning of high power communication satellites in synchronous equatorial orbit
Omalley, T. A.↗
An examination of the effects of station longitude errors on Doppler plus range and Doppler only orbit determination solutions with an emphasis on a Viking mission trajectory
Station longitude error effects on Doppler plus range and Doppler only orbit determination solutions, emphasizing Viking mission trajectory
Ondrasik, V. J.↗
Stable longitudes for 12 hour eccentric orbit satellites
Accelerated longitude drift regimes of eccentric 12 hour orbits due to resonant geopotential
Wagner, C. A.↗
Longitude distribution of solar flares
Statistical tests of solar flares based on maximum likelihood method, discussing longitude distribution, rigid rotation, planetary effects, etc
Fung, P. C. W.↗
The anomalous distribution in heliocentric longitude of solar injected cosmic radiation
Anomalous distribution in heliocentric longitude of solar injected cosmic radiation, suggesting interplanetary magnetic field lines of force stochastic wandering
Bukata, R. P.↗
Coronal propagation: Variations with solar longitude and latitude
Observational results on the East-West effect are summarized and discussed in the context of existing models of coronal propagation. The variation of the number of events with solar longitude is shown to be surprisingly similar for particles covering a large interval of rigidities. Also, over large longitudinal distances, time delays to the event onset and maximum intensity are independent of energy and velocity. This has important implications and will require probably a transport process which is determined by fundamental properties of solar magnetic fields, e.g. reconnection processes between open and closed field configurations. The relative role of open and closed field configurations is extensively discussed. Some evidence is presented that the acceleration of protons to higher (approximately 10 MeV) energies is related with a shock wave traveling in the solar atmosphere. The importance of measurements performed from spacecraft out-of-the-ecliptic plane is stressed.
Wibberenz, G.↗
The prime meridian of Mars and the longitudes of the Viking landers
A planetwide control net of Mars has been computed by a single large-block analytical triangulation derived from 17,224 measurements of 3,037 control points on 928 Mariner 9 pictures. The computation incorporated the Viking-determined direction of the spin axis and rotation rate of Mars. The angle measured from the vernal equinox to the prime meridian (areocentric right ascension) of Mars was determined to be 148.368 deg + 350.891986 deg (JD - 2433282.5), where JD refers to the Julian date. The prime meridian of Mars passes through the center of the small crater Airy-O. The longitudes of the Viking landers are 47.82 + or - 0.1 deg for Lander 1 and 225.59 + or - 0.1 deg for Lander 2.
Davies, M. E.↗
M2 ocean tide parameters and the deceleration of the moon's mean longitude from satellite orbit data
An estimation was made of the principal long period spherical harmonic parameters in the representation for the M sub 2 ocean tide from the orbital histories of three satellites - 1967-92A (TRANSIT), Starlette, and GEOS-3. The data used were primarily the evolution of the orbital inclinations of the satellites, with the addition of the longitude of the ascending node from GEOS-3. The results are: (1) C sub 22 superscript + = 3.42 plus or minus 0.24 cm; (2) sub 42 superscript + = 0.97 plus or minus 0.12 cm; (3) epsilon subscript 22 superscript + = 325 D.5 plus or minus 3.D9; (4) epsilon subscript 42 superscript + = 42 = 124D.0 plus or minus 6 D.9. These values agree quite well with recent numerical models and another recent determination from satellite data. The M sub 2 parameters obtained here infer an N of -25 plus or minus 3 arc seconds/century squared, in good agreement with other investigators. The range of current determinations of N is from -24.6 to 27.2 arc second/century squared.
Felsentreger, T. L.↗
A geostationary longitude acquisition planning algorithm
The paper is concerned with the phase of the geosynchronous mission termed station acquisition, which involves the maneuvering of a spacecraft to its geostationary longitude by means of the spacecraft propulsion system. An algorithm which assists in maneuver planning is described, and examples of its use are presented. The algorithm can be applied when sequences of more than three maneuvers are to be expected. While, in general, three maneuvers are sufficient to achieve the desired end conditions when orbital mechanics are the only consideration, operational considerations may add constraints resulting in an increased number of maneuvers required.
Petruzzo, C. J.↗