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Maran, S. P.

Publications and source records attributed to Maran, S. P..

At least 73 records · Page 4
All sourcesNASA NTRSDOE OSTI
NASA NTRS1974

Preliminary results on Comet Kohoutek - Interactions with the solar wind

A preliminary summary is presented for the types of data obtained on possible interactions between Comet Kohoutek and the solar wind. The data include Pioneer 8 solar wind density measurements along a line of sight through or near the comet's position; Pioneer 6 plasma measurements near the projected position of the ion tail 100 million km from the nucleus; Lyman-alpha observations of the cometary hydrogen cloud from Skylab and Mariner 10; and ground-based radio, spectroscopic, and photographic observations. Preliminary analysis of some data is provided.

Brandt, J. C.↗
NASA NTRS1973

Kohoutek - A great comet coming.

Passing inside the earth's orbit in late November, the comet Kohoutek will travel through the inner solar system during a unique period in the history of the space program, when Skylab and Mariner Venus-Mercury are in operation and the new C-141 Airborne Infrared Observatory is ready for flight. It is planned to investigate comprehensively the nature and evolution of the coma and tails of the comet. The detailed goals of the investigation include the identification of the parent molecules of the gases observed in comets, the determination of the processes that break down the parent molecules, the study of the physical nature of transient events in the comet, and the measurement of the solar-wind velocity in the inner solar system.

Maran, S. P.↗
NASA NTRS1973

Ground-based flare studies at Sacramento Peak

The structure of an isolated solar flare point observed by vacuum telescope and multichannel spectrophotometer is considered. The tiny bright spot in H alpha photos lasted less than 30 seconds and coincided with a Type-III solar burst; a soft X-ray burst peaked at the time of this event. The small scale structure of the flare point exhibited in miniature the characteristics of a true flare event.

Maran, S. P.↗
NASA NTRS1973

The OSO-7 year of discovery.

The OSO 7 scientific findings reveal hitherto unknown processes in solar flares and some remarkable properties of the corona. Gamma-ray emission lines provide evidence of nuclear reactions in solar flares. The measurements were made during the large flares of Aug. 4 and 7, 1972. The data clearly show line emission at energies of about 0.5 MeV (million electron volts) and 2.2 MeV, with weaker enhancements at 4.4 MeV and 6.1 MeV. It appears that the nuclear processes in flares as revealed by OSO 7 are probably thermal reactions. Some flare electron streams also produce bursts of hard X rays. Holes and poles in the corona, and coronal streams and the interplanetary blast were studied.

Maran, S. P.↗
NASA NTRS1973

Astronomical observations with an SEC vidicon system.

Description of the design and operation of an SEC vidicon camera system, and review of some of the astronomical observations performed with it. Following a discussion of the main system and instrumentation features and a delineation of present and future software tasks, the preliminary series of observations obtained in conjunction with the 36-inch telescope at Kitt Peak National Observatory is briefly surveyed. These observations include (1) exposures on the Orion Nebula through various narrow-band interference filters, and (2) exposures on the galaxy Messier 82 in white light and with medium band filters.

Chiu, H.-Y.↗
NASA NTRS1972

Giant loops: A new kind of nebula

Four enormous, loop-shaped features were found in ground-based surveys of the low-frequency galactic radio emission. With diameters of 40 to 116 deg, they include the Cetus Arc and the North Polar Spur and were formerly called the radio spurs.

Maran, S. P.↗
NASA NTRS1972

New theory for giant loops.

Four very large, shell-shaped features are known from the surveys of radio emission from the Galaxy. It is suggested that the giant loops represent a class of nebulae, induced by supernova radiation as opposed to supernova ejecta. The model considered provides a qualitative explanation for the spectral and polarization properties of the radio emission from giant loops. The radio emitting electrons are part of the general cosmic ray gas and need not arise specifically in the supernova that produced the fossil Stroemgren sphere.

Brandt, J. C.↗
NASA NTRS1972

New horizons in astronomy.

Besides the study of astronomy itself, other topics included cover the geological and biological developments on earth and basic physics of matter, heat, and light. Optical and radio telescopes are discussed, as well as photographic and photoelectric means of detection. The immediate solar system is described by topics on the properties and atmospheres of the inner and outer planets, the sun's energy, sunspots, and the solar spectrum. Stars both on and off the main sequence are discussed in terms of distances, intrinsic properties, lifetimes and evolution. The Milky Way is compared to other galaxies in size, star population and structure, and the different galaxy shapes are pictured. Topics of most recent interest are covered by results of the lunar explorations, new concepts of Mars, and problems of space travel. Problems of modern astronomy include pulsars, neutron stars, and quasars.

Brandt, J. C.↗
NASA NTRS1971

The Gum Nebula.

A historical review of observations on the Gum Nebula is given together with a survey of knowledge on its size, emission features, and dynamics of expansion. The ultraviolet spectrum of Zeta Puppis is examined in terms of features caused by various absorption lines, and radio emission from Vela X is analyzed, together with the effects of nebular plasma on the propagation of radio pulses from pulsars in the Nebula. The density distribution and the possibility of being produced by the Vela X supernova are discussed.

Maran, S. P.↗
NASA NTRS1971

The Gum nebula and related problems

Papers were presented in conference sessions on the Gum nebula, the Vela X remnant, the hot stars gamma Velorum and zeta Puppis, the B associations in the Vela-Puppis complex, and pulsars. Ground-based optical and radio astronomy; rocket and satellite observations in the radio, visible, ultraviolet, and X-ray regions; and theoretical problems in the physical state of the interstellar medium, stellar evolution, and runaway star dynamics were considered.

Maran, S. P.↗