WorldCat Identities

Scarf, F. L.

Overview
Works: 43 works in 61 publications in 1 language and 119 library holdings
Publication Timeline
Key
Publications about  F. L Scarf Publications about F. L Scarf
Publications by  F. L Scarf Publications by F. L Scarf
Most widely held works by F. L Scarf
Ongoing data reduction, theoretical studies, and supporting research in magnetospheric physics by F. L Scarf ( Book )
1 edition published in 1984 in English and held by 57 WorldCat member libraries worldwide
High Resolution Spectrograms of Ion-Acoustic Waves in the Solar Wind by W. S Kurth ( Book )
3 editions published in 1978 in English and held by 3 WorldCat member libraries worldwide
Ion-acoustic waves, similar to those detected by the helios spacecraft from 0.3 to 1.0 AU, have now been detected by the Voyager spacecraft in the solar wind out to heliocentric radial distances of 1.7 AU. High bit rate waveform measurements provide the first high resolution, frequency-time spectrograms of these waves. The Voyager spectrograms show that the ion-acoustic waves consist of narrow-band bursts which last for a few seconds or less. The center frequency of the bursts can fluctuate rapidly in frequency, usually in the range between the electron and ion plasma frequency f sub p( - ) and f sub p(+). (These waves have been previously referred to as f sub p(+) <f <f sub p( - ) noise.)
Plasma waves near Saturn : initial results from Voyager 1 by Donald A Gurnett ( Book )
3 editions published in 1981 in English and held by 3 WorldCat member libraries worldwide
The Voyager 1 plasma wave instrument detected many familiar types of plasma waves during the encounter with Saturn, including ion-acoustic waves and electron plasma oscillations upstream of the bow shock, an intense burst of electrostatic noise at the shock, and chorus, hiss, electrostatic (n + 1/2)fg waves and UHR emissions in the inner magnetosphere. A clock-like Saturn rotational control of low-frequency radio emissions was observed, and evidence was obtained of possible control by the moon Dione. Strong plasma wave emissions were detected at the Titan encounter indicating the presence of a turbulent sheath extending around Titan, and UHR measurements of the electron density show the existence of a dense plume of plasma being carried downstream of Titan by the interaction with the rapidly rotating magnetosphere of Saturn. (Author)
Narrowband electromagnetic emissions from Jupiter's magnetosphere by Donald A Gurnett ( Book )
3 editions published in 1982 in English and held by 3 WorldCat member libraries worldwide
Recent studies of wideband plasma wave data from the Voyager 1 and 2 flybys of Jupiter have revealed the existence of narrowband radio emissions in the frequency range 1 -12 kHz. These narrowband emissions are very similar to narrowband emissions previously discovered in the magnetospheres of Earth and Saturn, and are believed to be produced by mode conversion from electron cyclotron waves near the upper hybrid resonance frequency. This mode conversion process is apparently one of the basic mechanisms for generating planetary radio emissions. In this paper we describe the characteristics of the Jovian narrowband emissions and discuss possible mechanisms for generating these emissions. In this paper we describe the characteristics of the Jovian narrowband emissions and discuss possible mechanisms for generating these emissions
The structure of Titan's wake from plasma wave observations by Donald A Gurnett ( Book )
2 editions published in 1981 in English and held by 2 WorldCat member libraries worldwide
During the Voyager 1 flyby of Saturn's moon Titan, the plasma wave instrument detected several types of plasma wave emissions. On the inbound leg a broad region of intense low frequency noise was detected on the side of Titan facing away from Saturn. This noise has characteristics similar to the electric field turbulence observed in the magnetosheath at Earth and the ionosheath at Venus and is believed to be generated by newly created ions which are being accelerated in the vicinity of Titan by the corotational electric field. During the pass through the induced magnetic tail of Titan, a series of upper hybrid resonance emissions were observed. Large depressions in the magnetic field strength are observed coincident with each of the density peaks. These effects indicate that a dense plume of plasma is being carried downstream of Titan by the interaction with the rapidly rotating magnetosphere of Saturn. During the pass through the tail, a second type of low frequency electric field noise was observed with characteristics very similar to a type of noise called broadband electrostatic noise which is found in the Earth's magnetic tail. As in the case of the Earth, this noise is most intense near the outer boundary of the plasma sheet and is almost completely absent in the high density region near the neutral sheet. (Author)
Sporadic narrowband radio emissions from Uranus by W. S Kurth ( Book )
2 editions published in 1986 in English and held by 2 WorldCat member libraries worldwide
Among several different types of radio emissions discovered at Uranus during the Voyager 2 encounter in January 1986 is a very sporadic, bursty signal which consists of very narrow bands lying in the frequency range from about 3 to 10 kHz. The bursty emission was virtually undetectable from the dayside portion of the Voyager 2 trajectory but was observed out to beyond 300 RU during the outbound trajectory through the pre-dawn sector. While the narrowband tones making up this emission are reminiscent of escaping continuum radiation observed near Earth, Jupiter and Saturn, the Uranian signals show large amplitude variations on time scales of a second suggesting a very different type of generation mechanism. (Author)
Spatial and temporal studies of Jovian kilometric radiation by W. S Kurth ( Book )
1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide
The Control of Saturn's Kilometric Radio Emission by Dione by W. S Kurth ( Book )
2 editions published in 1981 in English and held by 2 WorldCat member libraries worldwide
Observations of Saturn's kilometric radio emissions obtained by the voyager 1 plasma wave receiver during the encounter of the Saturnian system in late 1980 reveal a strong but apparently transitory control by the orbital phase angle of Dione. At 56 kHz the effect of the Dione control is particularly evident during a two-week period centered roughly on closet approach. The intensity of the Saturnian emission is suppressed sharply when Dione is in the local dust sector. We propose that the transitory nature of the Dione control is actually a geometric effect and that a time-variable plasma torus associated with Dione can explain most of the observed details of the Dione modulation by creating a shadow zone near the equatorial plane. (Author)
Dust particles detected near Giacobini-Zinner by the ice plasma wave instrument by Donald A Gurnett ( Book )
2 editions published in 1986 in English and held by 2 WorldCat member libraries worldwide
During the ICE (International Cometary Explorer) flyby of Giacobini-Zinner the plasma wave instrument detected numerous impulsive signals caused by dust impacts on the spacecraft. Most of the impacts occurred within 30,000 km of the comet. The impact rate averaged over the inbound and outbound legs varies approximately as 1/r-square, as would be expected for an isotropic constant velocity radial outflow. Small differences between the inbound and outbound legs exist which may be indicative of azimuthal variations in the dust production rate. A simple model of the impact ionization and charge collection by the antenna indicates that the particles have a mass on the order of 10 to the -12th power to 10 to the -10th power gm, corresponding to particles with radii of a few microns. Keywords: Interplanetary space; Dust particles
Plasma wave experiment for the ISEE-3 Mission semi-annual report, February 20, 1981-August 19, 1981 by F. L Scarf ( )
2 editions published in 1981 in English and held by 2 WorldCat member libraries worldwide
"Analyses of data from the scientific instrument designed to study solar wind and plasma wave phenomena on the International Sun Earth Explorer 3 are presented. Plasma turbulence upstream and downstream of interplanetary shocks was detected. The microscopic plasma waves associated with interplanetary shocks were studied in the broad context of a discussion of some potential contributions to collisionless shock and cosmic ray acceleration theories. The central issue here was whether heated ions create magnetohydrodynamic turbulence as part of the quasi-parallel shock structure. The analysis suggests that the plasma physics near the Earth's bow shock may apply to interplanetary shocks on a far larger scale. Additional analyses concerning whistler mode wave propagation and Earth's foreshock structure are briefly described."
Periodic amplitude variations in Jovian continuum radiation by W. S Kurth ( Book )
2 editions published in 1986 in English and held by 2 WorldCat member libraries worldwide
An analysis of periodic variations in the amplitude of continuum raidation trapped in the Jovian magnetosphere shows structure with periods near both five and ten hours. Contrary to a plausible initial idea, the continuum amplitudes are not organized by position of the observer relative to the dense plasma sheet. Instead, there seem to be preferred orientations of system III longitude with respect to the direction to the sun which account for the peaks. This implies a clock-like modulation of the continuum radiation intensity as opposed to a searchlight effect. The importance of the dipole longitude-solar wind alignment to the amplitude of the continuum radiation implies the source region of the radiation is near the magnetopause and may tie the generation of the radio waves to the clock like modulation of energetic electron fluxes from Jupiter
Plasma wave observations at Uranus from Voyager 2 by Donald A Gurnett ( Book )
2 editions published in 1986 in English and held by 2 WorldCat member libraries worldwide
Radio emissions from Uranus were detected by the Voyager 2 plasma wave instrument about 5 days before closets approach at frequencies of 31.1 and 56.2 khz. The bow shock was identified by an abrupt broadband burst of electrostatic turbulence about 10 hours before closest approach at a radial distance of 23.5 ru. Once inside of the magnetosphere strong whistler mode hiss and chorus emissions were observed at radial distances less than about 8 R sub u, in the same region where the energetic particle instruments detected intense fluxes of energetic electrons. A variety of other plasma waves, such as (f sub c) electron cyclotron waves, were also observed int his same region. At the ring plane crossing the plasma wave instrument detected a large number of impulsive events that are interpreted as impacts of micron sized dust particles on the spacecraft. The maximum impact rate was about 20 to 30 impacts/sec, and the north-south thickness of the impact region was about 4,000 km. In this paper presents an overview of the principal results from the plasma wave instrument, starting with the first detection of radio emissions from Uranus, and ending a few days after closest approach
Detection of nonthermal continuum radiation in Saturn's magnetosphere by W. S Kurth ( Book )
2 editions published in 1982 in English and held by 2 WorldCat member libraries worldwide
A detailed analysis of high resolution wideband data from the Voyager 1 and 2 plasma wave receivers has revealed the presence of heretofore undiscovered nonthermal continuum radiation trapped within the Saturnian magnetosphere. The discovery of Saturnian trapped continuum radiation fills a disturbing void in the Saturnian radio spectrum. On the basis of observations at both the Earth and Jupiter it was expected that continuum radiation should be a pervasive signature of planetary magnetospheres in general. Special processing of the Voyager I plasma wave data at Saturn has now confirmed the existence of weak emissions that have a spectrum characteristics of trapped continuum radiation. Similar radiation was also detected by Voyager 2; however, in this case it is not certain that Saturn was the only source. Considerable evidence exists which suggests that Saturn may have been immersed in the Jovian tail during the Voyager 2 encounter, so tha Jupiter may provide an additional source of the continuum radiation detected by Voyager 2. (Author)
A summary of whistlers observed by Voyager 1 at Jupiter by W. S Kurth ( Book )
2 editions published in 1983 in English and held by 2 WorldCat member libraries worldwide
We summarize the Voyager 1 observations of whistlers at Jupiter in order to provide a basis for further analyses of the density profile of the Io plasma torus as well as to support studies of atmospheric lightning at Jupiter. All the whistlers detected by Voyager 1 fell into three general regions in the torus at radial distances ranging between 5 and 6 R sub J. An analysis of the broadband wave amplitudes measured by the Voyager 1 plasma wave instrument and estimates of the peak whistler amplitudes imply the grouping of whistlers was due to variations in the sensitivity of the receiver to whistlers and not to variations in the source or propagation paths of the whistlers. The whistler dispersions are presented in statistical form for each of the three groups of events and analyzed in view of the structure of the Io plasma torus as determined by plasma probe measurements. The results of these analyses give source locations for the whistlers at the foot of the magnetic field lines threading the torus in both hemispheres and over a range of longitudes. (Author)
Recent observations of the very low frequency interplanetary radio emission by W. S Kurth ( Book )
2 editions published in 1986 in English and held by 2 WorldCat member libraries worldwide
Observations of radio emissions in the frequency range of 2 to 3 kHz have been made in the distant heliosphere by the Voyager 1 and 2 plasma wave instruments. Based primarily on wideband observations made periodically throughout the cruise phases of the missions the radio emission, first observed in 1982, appears to have been present almost continuously since 1983. The spectrum is complex, usually showing two peaks, one near 2 and another near 3 kHz. Occasionally, only one of the peaks is observed. A possible source for the radio emissions is the terminal shock in the outer heliosphere
Narrowband electromagnetic emissions from Saturn's magnetosphere by Donald A Gurnett ( Book )
2 editions published in 1981 in English and held by 2 WorldCat member libraries worldwide
During the Voyager 1 flyby of Saturn a series of narrowband electromagnetic emissions were detected by the plasma wave instrument coming from the inner region of the magnetosphere in the frequency range from 3 to 30 kHz. These emissions have many close similarities to continuum radiation detected in the Earth's magnetosphere and narrowband kilometric radiation (nKOM) detected in the Jovian magnetosphere. Based on the close similarity to the terrestrial continuum radiation the Saturn narrowband emissions are interpreted as being generated by mode conversion from intense electrostatic waves at half-integral harmonics of the electron gyrofrequency. The observed frequency spacing suggests that the emissions are being generated near the moons Tethys, Dione and Rhea, probably in regions of large plasma density gradients associated with boundaries of the plasma sheet. (Author)
Electrostatic waves in the Jovian magnetosphere by W. S Kurth ( Book )
1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide
Singular potentials in quantum mechanics by F. L Scarf ( Book )
1 edition published in 1956 in English and held by 2 WorldCat member libraries worldwide
Detection of a radio emission at 3 kHz in the outer heliosphere by W. S Kurth ( Book )
1 edition published in 1984 in English and held by 1 WorldCat member library worldwide
Electrostatic waves in the magnetosphere of Uranus by W. S Kurth ( Book )
1 edition published in 1987 in English and held by 1 WorldCat member library worldwide
 
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