Results 211 to 220 of about 3,908 (245)

Physical consistency in modeling interplanetary magnetohydrodynamic fluctuations

Physical Review Letters, 1990
The validity of the Velli, Grappin and Mangeney (1989) model is evaluated. It is argued that the model is incorrect because it mixes different dynamical models, assumes weak nonlinearities, makes predictions that vary with observations, and violates causality.
, Zhou, , Matthaeus, , Roberts, , Goldstein   +3 more
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Physical Properties of Interplanetary Grains

International Astronomical Union Colloquium, 1976
This paper presents physical properties of interplanetary dust determined by in-situ techniques. It is probable that, like millimeter-sized meteoroids (Jacchia, et al. 1967), most interplanetary dust is cometary matter. Although a cometary origin for interplanetary dust is widely accepted (Whipple 1967) (Millman, 1972) there is currently no unambiguous
D. E. Brownlee, F. Horz, D. A. Tomandl, P. W. Hodge   +3 more
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Physical properties of cometary and interplanetary dust

Planetary and Space Science, 2007
Abstract In the absence of numerous in situ studies, physical properties of cosmic dust may be derived from observations of their light scattering and thermal properties, through numerical simulations making use of realistic assumptions. Estimations about cometary and interplanetary dust composition, structure, size, as well as about their light ...
Levasseur-Regourd, Anny Chantal, Mukai, T., Lasue, Jérémie, Okada, Y.   +3 more
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Physical Processes on Interplanetary Dust

2001
This chapter discusses physical processes affecting interplanetary dust grains, including processes determining dust formation, growth, disruption, and alteration. Computer simulations and laboratory studies of coagulation and aggregation show that mutual collisions between solid grains determine the growth of solid aggregates in the early solar system
Tadashi Mukai, Akiko M. Nakamura, Jürgen Blum, Robert E. Johnson, Ove Havnes   +4 more
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On the size distribution and physical properties of interplanetary dust grains

Icarus, 1980
Abstract This paper synthesizes information on the size distribution and physical properties of interplanetary dust grains obtained from analyses of lunar microcraters performed until 1979. The different aspects of these analyses (counting methods, simulation, calibrations) are summarized and a large amount of data is collected and discussed in order
L.B. Le Sergeant D'Hendecourt, Ph.L. Lamy   +1 more
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Interplanetary Coronal Mass Ejections Observed in the Heliosphere: 3. Physical Implications

Space Science Reviews, 2009
We conclude the heliospheric image series with this third and final instalment, where we consider the physical implications of our reconstruction of interplanetary coronal mass ejections from heliospheric imagers. In Paper 1 a review of the theoretical framework for the appearance of ICMEs in the heliosphere was presented and in Paper 2 a model was ...
Timothy A. Howard, S. James Tappin
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The role of collisions with interplanetary particles in the physical evolution of comets

The Moon and the Planets, 1981
Effects of collisions with interplanetary particles are investigated. To this purpose, collision probabilities for comets with different orbital elements are computed. It is found that collisions may have a non-negligible effect on the physical evolution of comets.
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Physical Properties of the Interplanetary Medium

1985
The solar wind is one of the main factors which, along with electromagnetic radiation from the Sun and planets, determines physical conditions in the circumsolar space. This is a more or less continuous plasma flow which is generated in the upper corona of the Sun and carries magnetic fields of solar origin.
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Predicting the physical parameters of interplanetary shock waves using Artificial Neural Networks trained on NASA’s ACE and WIND spacecrafts

2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020
This study aims to develop artificial neural networks to predict the physical parameters of the shock waves in the interplanetary (IP) environment which are closely correlated to the sunspot number as demonstrated in previous studies [1] and [2]. This is done by training the ANNs with the current available data and then use the model to predict for the
ÇAVUŞ, HÜSEYİN, RAHEEM, ABD-UR, ÇOBAN, Gani Çağlar   +2 more
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Overview of Solar Radio Physics and Interplanetary Disturbances

2004
Solar radio emission has been observed from a few hundred GHz down to a few kHz and has revealed a large variety of phenomena. Thanks to this broad frequency window, solar phenomena can be probed from a fraction of a solar radius out to 1 AU and beyond.
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