Journal ArticleDOI
A synoptic study of doppler scintillation transients in the solar wind
TLDR
In this paper, the first synoptic study of Doppler scintillation transients caused by interplanetary disturbances was conducted, where a total of 148 separate transients covering a heliocentric distance range of 5-179 solar radii were detected, including 26 transients detected by more than one spacecraft.Abstract:
This paper conducts the first synoptic study of Doppler scintillation transients caused by interplanetary disturbances. The Doppler scintillation data used are part of the 2.3-GHz navigation data collected by the NASA Deep Space Network when tracking planetary spacecraft during 1979-1983, a period that includes solar maximum. A total of 148 separate transients covering a heliocentric distance range of 5-179 solar radii were detected, including 26 transients detected by more than one spacecraft. The frequency of occurrence was highest near the sun and decreased with radial distance, a reflection of the radial evolution of the transients and the sensitivity of the Doppler scintillation measurements to transients. Since transients can be disruptive, as was demonstrated during the encounter of Saturn by Pioneer 11 in 1979, information on Doppler scintillation transients is essential.read more
Citations
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Journal ArticleDOI
MHD study of temporal and spatial evolution of simulated interplanetary shocks in the ecliptic plane within 1 AU
Zdenka Smith,Murray Dryer +1 more
TL;DR: In this paper, the authors used a 21/2-D MHD time-dependent model to perform a parametric study of interplanetary shock propagation to 1 AU, where the input conditions were represented by the following variables: initial shock velocity, duration of the driving pulse, and width of the pulse at the near-Sun position (18 solar radii).
Book ChapterDOI
Remote Sensing Observations of the Solar Corona
Michael K. Bird,Peter Edenhofer +1 more
TL;DR: In situ measurements of the outer solar atmosphere have been conducted only down to a distance of 0.3 AU (62R ⊙) by the Helios spacecraft as mentioned in this paper.
Journal ArticleDOI
ICMEs in the inner heliosphere: origin, evolution and propagation effects
R. J. Forsyth,Volker Bothmer,Consuelo Cid,N. U. Crooker,Timothy S. Horbury,Karoly Kecskemety,Berndt Klecker,Jon A. Linker,Dusan Odstrcil,M. J. Reiner,Ian G. Richardson,Javier Rodriguez-Pacheco,J. M. Schmidt,Robert F. Wimmer-Schweingruber +13 more
TL;DR: In this paper, the authors assess the current status of research relating the origin at the Sun, the evolution through the inner heliosphere and the effects on the interplanetary counterparts of coronal mass ejections.
Journal ArticleDOI
Large-scale propagation properties of interplanetary disturbances revealed from IPS and spacecraft observations
Takashi Watanabe,Rainer Schwenn +1 more
TL;DR: In this paper, an interplanetary disturbance apparently in association with a disappearing solar filament, which took place near the central meridian of the Sun on late 22 April, 1979, is discussed to examine previous deductions from IPS observations.
Journal ArticleDOI
Predictability of Dst index based upon solar wind conditions monitored inside 1 AU
TL;DR: In this article, it was shown that a solar wind monitor that provides a substantial geomagnetic forecast lead time, with usable predictions of the characteristics of the solar wind, can be stationed -0.7 AU if it is near the ecliptic plane and within 10° east to 5° west of the Earth-Sun line.
References
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Journal ArticleDOI
Coronal mass ejections and interplanetary shocks
N. R. Sheeley,Russell A. Howard,M. J. Koomen,D. J. Michels,Rainer Schwenn,K.-H. Mühlhäuser,H. Rosenbauer +6 more
TL;DR: A comparison between Solwind observations of coronal mass ejections (CME's) and Helios 1 observations of interplanetary shocks during 1979-1982 indicates that 72 percent of the shocks were associated with large, low-latitude mass ejection on the nearby limb.
Journal ArticleDOI
Interplanetary Scintillation of Small Diameter Radio Sources
TL;DR: In this article, the authors used the black-body equations to calculate the increased radiation appropriate to the observed brightness increase in the star over a 1,000 A.u. band-width at 5,400 A.U.
Journal ArticleDOI
Spacecraft radio scattering observations of the power spectrum of electron density fluctuations in the solar wind
Richard Woo,John W. Armstrong +1 more
TL;DR: In this article, the solar wind electron density power spectra in the solar equatorial region is inferred from observations of phase scintillations and spectral broadening made with the Viking, Helios, and Pioneer spacecraft.
Journal ArticleDOI
The evolution of interplanetary shocks
TL;DR: In this paper, the authors identify the solar events associated with 48 interplanetary (IP) shocks by observing radio emission generated by the shocks, which makes possible an investigation of the way in which these shocks evolve and the relationship between solar event strength and shock velocity.
Journal ArticleDOI
Numerical simulation of flare‐generated disturbances in the solar wind
A. J. Hundhausen,R. A. Gentry +1 more
TL;DR: In this article, the propagation of flare-generated shock waves through the solar wind is examined using numerical solutions of the time-dependent hydrodynamic equations, and the relationship among the energy, shock strength at 1 AU, and transit time to 1 AU is found in the blast wave limit.
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