What can Meteoroid Streams Tell us About the Ejection Velocities of Dust from Comets

1996 ◽  
pp. 321-326
Author(s):  
I. P. Williams
Keyword(s):  
Meteoroid Streams

Meteoroid streams at Mars: possibilities and implications

1999 ◽  
Vol 47 (12) ◽  
pp. 1475-1485 ◽  
Author(s):  
Apostolos A. Christou ◽  
Kevin Beurle
Keyword(s):  
Meteoroid Streams

scholarly journals Modern radar techniques and the hazard of meteoroids to space platforms

1998 ◽  
Vol 41 (5-6) ◽  
Author(s):  
G. Cevolani
Keyword(s):  
Parent Body ◽  
Low Earth Orbit ◽  
Space Environment ◽  
Meteoroid Streams ◽  
Storm Activity ◽  
Plasma Generation ◽  
Near Earth Space ◽  
Space Objects ◽  
Very High ◽  
Perihelion Passage

Modern radar techniques, and in particular ground based radars, are a powerful tool to observe space objects (natural meteoroids and artificial space debris) on account of their all-weather and day-and-night performance. Natural meteoroids are an important component of the near-Earth space environment and represent a potential risk for all Earth-orbiting space platforms, which could significantly increase in coincidence of enhanced (outburst or storm) activity of meteoroid streams. A review of the currently active meteoroid streams suggests that a few streams have shown a quasi-periodic outburst activity in the two last centuries and may even undergo a storm activity in the next few years. The Leonids, the most intense of meteor showers, present a potentially serious damage to spacecraft in November of 1998 and 1999, after the perihelion passage of the parent body. Impact probability values of storm meteoroids on space platforms in Low Earth Orbit (LEO) were calculated using the data recorded during systematic observational campaigns carried out by the FS radar facility Bologna-Lecce in Italy. Meteoroid flux predictions and directionality, and investigation on impact parameters at very high velocities (up to 71 km/s) for penetration, charge production and plasma generation, are relevant aspects to develop strategies for safe deployment of the near Earrth-orbiting space platforms.

scholarly journals The Use of Geocentric Variables to Search for Meteoroid Streams and Their Parents

1999 ◽  
Vol 172 ◽  
pp. 55-64
Author(s):  
CL. Froeschlé ◽  
T.J. Jopek ◽  
G.B. Valsecchi
Keyword(s):  
Meteoroid Stream ◽  
Meteoroid Streams ◽  
Photographic Meteor Orbits

AbstractA set of geocentric variables suitable for the identification of meteoroid streams has been recently proposed and successfully applied to photographic meteor orbits. We describe these variables and the secular invariance of some of them, and discuss their use to improve the search for meteoroid stream parents.

scholarly journals JD23 The Leonid Meteor Storms:- Historical Significance and Upcoming Opportunities

1998 ◽  
Vol 11 (2) ◽  
pp. 1003-1004
Author(s):  
I.P. Williams
Keyword(s):  
Meteoroid Streams ◽  
Historical Significance ◽  
History Of

Without doubt, the Leonid stream is the most famous of all the known meteoroid streams. The reason for this is not hard to find, the display of meteors that it produces at times far surpassess anything that any other shower can produce. The showers of 1799, 1833 and 1966 all have numerous engravings or photographs recording the splendidness of the displays. The recorded history of the appearances of spectacular Leonid displays dates back for two millenia. Though the associated parent comet, 55/P Tempel-Tuttle, was only discovered in 1861.

Associations Between Asteroids and Meteoroid Streams

2005 ◽  
Vol 95 (1-4) ◽  
pp. 697-712 ◽  
Author(s):  
V. Porubčan ◽  
I.P. Williams ◽  
L. Kornoš
Keyword(s):  
Meteoroid Streams

scholarly journals The Dynamics of Meteoroid Streams

1992 ◽  
Vol 152 ◽  
pp. 299-313
Author(s):  
I. P. Wiliams
Keyword(s):  
Chaotic Behavior ◽  
Equations Of Motion ◽  
Meteoroid Streams ◽  
Meteor Streams ◽  
High Order Resonance ◽  
Large Numbers ◽  
The Mean ◽  
Heliocentric Orbits ◽  
Basic Level ◽  
Small Dust

Meteor showers are seen at regular and frequent intervals on Earth. They are caused by meteoroids (that is small dust grains) in a coherent stream, all moving on similar heliocentric orbits, burning up on encountering the atmosphere of the Earth. Such streams contain 1012 or more meteoroids, with the mass of the visible meteoroids ranging up to about 1 g. The main evolutionary effect on such streams is gravitational perturbations by the planets. Though grain-grain collision may be catastrophic for the two grains involved, it has no effect on the remainder of the stream, other than the fact that there are now two less grains in it. Solar radiation has some effect, but this can be included in the equations of motion. Because of the large numbers of particles involved, meteoroid streams represent a laboratory where many of our dynamical concepts can be tested.At a basic level, meteoroid streams represent a collective dynamical phenomenon in which all members display roughly the same behavior. One of the fundamental questions which can be investigated is whether the behavior of the mean orbit of the whole stream represents the mean behavior of the stream members. Within the boundaries of some meteor streams lie regions where the orbits are in high order resonance with Jupiter. This also represents a phenomenon of interest. Finally, the possibility exists that some streams are in chaotic regions and it is interesting to investigate whether or not meteoroids in such regions do display chaotic behavior.

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