scholarly journals From the Sun to the outer heliosphere: Modeling and analyses of the interplanetary propagation of the October/November (Halloween) 2003 solar events

2005 ◽  
Vol 110 (A9) ◽  
Author(s):  
Devrie S. Intriligator ◽  
Wei Sun ◽  
Murray Dryer ◽  
Craig D. “Ghee” Fry ◽  
Charles Deehr ◽  
...  
Keyword(s):  
The Sun ◽  
Outer Heliosphere ◽  
Solar Events ◽  
Interplanetary Propagation

scholarly journals Transient Phenomena Originating at the Sun - An Interplanetary View

1980 ◽  
Vol 91 ◽  
pp. 357-374
Author(s):  
Devrie S. Intriligator
Keyword(s):  
High Frequency ◽  
Interplanetary Medium ◽  
Coronal Holes ◽  
The Sun ◽  
Transient Phenomena ◽  
Solar Event ◽  
Physical Problems ◽  
Wide Range ◽  
Transient Events ◽  
Solar Events

An overview is given of various phenomena observed by numerous spacecraft in the interplanetary medium. These phenomena are related to transient solar events such as flares and coronal holes. The effects of such transient solar events are extensive. At times, a solar event can affect the interplanetary medium out to distances as far as 17.2 AU and over a wide range of azimuthal angles. Also some phenomena, such as high frequency fluctuations (precursors of shocks) in the interplanetary medium, appear beyond 1 AU. Thus, transient phenomena are significantly modified by their passage through this medium. The conclusion is reached that transient events originating on the sun and passing through the interplanetary medium represent complex and significant physical problems.

scholarly journals Particle Acceleration on the Sun and in the Heliosphere

2001 ◽  
Vol 203 ◽  
pp. 547-554
Author(s):  
E. C. Roelof
Keyword(s):  
Particle Acceleration ◽  
Energetic Particle ◽  
The Sun ◽  
Energetic Ions ◽  
Outer Heliosphere ◽  
Particle Propagation

Examples of the acceleration of energetic ions and electrons are given for the Sun, the middle heliosphere, and the outer heliosphere. The characteristics of the acceleration are revealed only after the effects of energetic particle propagation are understood.

scholarly journals Dynamical evolution of anisotropies of the solar wind magnetic turbulent outer scale

2011 ◽  
Vol 7 (S286) ◽  
pp. 164-167
Author(s):  
M. E. Ruiz ◽  
S. Dasso ◽  
W. H. Matthaeus ◽  
E. Marsch ◽  
J. M. Weygand
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Dynamical Evolution ◽  
The Sun ◽  
Magnetic Fluctuations ◽  
Integral Scale ◽  
Outer Heliosphere ◽  
Local Mean ◽  
And Diffusion ◽  
Inner Heliosphere

AbstractThe evolution of the turbulent properties in the solar wind, during the travel of the parcels of fluid from the Sun to the outer heliosphere still has several unanswered questions. In this work, we will present results of an study on the dynamical evolution of turbulent magnetic fluctuations in the inner heliosphere. We focused on the anisotropy of the turbulence integral scale, measured parallel and perpendicular to the direction of the local mean magnetic field, and study its evolution according to the aging of the plasma parcels observed at different heliodistances. As diagnostic tool we employed single-spacecraft correlation functions computed with observations collected by Helios 1 & 2 probes over nearly one solar cycle. Our results are consistent with driving modes with wave-vectors parallel to the direction of the local mean magnetic field near the Sun, and a progressive spectral transfer of energy to modes with perpendicular wave-vectors. Advances made in this direction, as those presented here, will contribute to our understanding of the magnetohydrodynamical turbulence and Alfvénic-wave activity for this system, and will provide a quantitative input for models of charged solar and galactic energetic particles propagation and diffusion throughout the inner heliosphere.

scholarly journals Modeling a space weather event from the Sun to the Earth: CME generation and interplanetary propagation

2004 ◽  
Vol 109 (A2) ◽  
Author(s):  
Ward B. Manchester ◽  
Tamas I. Gombosi ◽  
Ilia Roussev ◽  
Aaron Ridley ◽  
Darren L. De Zeeuw ◽  
...  
Keyword(s):  
Space Weather ◽  
The Sun ◽  
Weather Event ◽  
The Earth ◽  
Space Weather Event ◽  
Interplanetary Propagation

Chromospheric activity as a function of age in main-sequence stars

1966 ◽  
Vol 24 ◽  
pp. 40-43
Author(s):  
O. C. Wilson ◽  
A. Skumanich
Keyword(s):  
Main Sequence ◽  
The Sun ◽  
Main Sequence Stars ◽  
Tentative Conclusion ◽  
Chromospheric Activity ◽  
General Field ◽  
Large Clusters

Evidence previously presented by one of the authors (1) suggests strongly that chromospheric activity decreases with age in main sequence stars. This tentative conclusion rests principally upon a comparison of the members of large clusters (Hyades, Praesepe, Pleiades) with non-cluster objects in the general field, including the Sun. It is at least conceivable, however, that cluster and non-cluster stars might differ in some fundamental fashion which could influence the degree of chromospheric activity, and that the observed differences in chromospheric activity would then be attributable to the circumstances of stellar origin rather than to age.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Sign in / Sign up

Export Citation Format

Share Document