Accretion rate of cosmic spherules measured at the South Pole

Details Accretion rate of cosmic spherules measured at the South Pole Accretion rate of cosmic spherules measured at the South Pole

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998natur.392..899t&link_type=abstract

Nature, Volume 392, Issue 6679, pp. 899-903 (1998).

Mathematics

Probability

55

Scientific paper

Micrometeorites are terrestrially collected, extraterrestrial particles smaller than about 1mm, which account for most of the mass being accreted to the Earth,. Compared with meteorites, micrometeorites more completely represent the Earth-crossing meteoroid complex, and should include fragments of asteroids, comets, Mars and our Moon, as well as pre-solar and interstellar grains,. Previous measurements of the flux of micrometeoroids that survive to the Earth's surface have large uncertainties owing to the destruction of particles by weathering, inefficiencies in magnetic collection or separation techniques, low particle counts,, poor age constraint,, or highly variable concentrating processes,. Here we describe an attempt to circumvent these problems through the collection of thousands of well preserved and dated micrometeorites from the bottom of the South Pole water well, which supplies drinking water for the Scott-Amundsen station. Using this collection, we have determined precise estimates of the flux and mass distribution for 50-700-µm cosmic spherules (melted micrometeorites). Allowing for the expected abundance of unmelted micrometeorites in the samples, our results indicate that about 90% of the incoming mass of submillimetre particles evaporates during atmospheric entry. Our data indicate the loss of glass-rich and small stony spherules from deep-sea deposits,, and they provide constraints for models describing the survival probability of micrometeoroids,.

Affiliated with

Also associated with

No associations

Rating

Accretion rate of cosmic spherules measured at the South Pole 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 Accretion rate of cosmic spherules measured at the South Pole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Accretion rate of cosmic spherules measured at the South Pole will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1606650