Other
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.495...33w&link_type=abstract
In: Proceedings of the Meteoroids 2001 Conference, 6 - 10 August 2001, Kiruna, Sweden. Ed.: Barbara Warmbein. ESA SP-495, Noordw
Other
6
Meteoroids, Cometary Nuclei
Scientific paper
The value of the ejection velocity of meteoroids from cometary nuclei is determined by the physical processes that are ongoing there. In broad terms, this is well-understood: as the comet approaches the Sun, the increasing solar radiation falling on the nucleus heats it up until ices sublime causing an outflow of gas. This gas outflow drags out and accelerates meteoroids away from the nucleus. The details of the processes and values of the parameters involved are less well determined. Hence a fairly wide range of ejection velocity values can be obtained depending on the detailed choices made, ranging from a few meters per second to a few hundred meters per second. Reversing the argument, if the value of the ejection velocity is known, then it helps to constrain the value of parameters relevant to the nucleus and details of the physical processes. From the view-point of understanding meteor stream evolution, the initial velocity is also important. Both the initial velocity and gravitational perturbations cause a dispersal of stream meteoroids and a precise determination of one allows the other to be quantified. Here, as well as discussing the general problem, we concentrate on situations where the final outcome is very sensitive to the assumed initial velocity and hence, by reversing the argument, if the final outcome is observed, then the ejection velocity must have been within a narrow permitted range. Most of the arguments lead to values of the ejection velocity of the order of 75 m s-1 - rather close to the values obtained for one millimeter sized grains by Whipple half a century ago.
No associations
LandOfFree
The determination of the ejection velocity of meteoroids from cometary nuclei does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The determination of the ejection velocity of meteoroids from cometary nuclei, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The determination of the ejection velocity of meteoroids from cometary nuclei will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1240234