Show simple item record

dc.contributor.authorLazerson, Samuel A.
dc.date.accessioned2018-08-07T00:59:19Z
dc.date.available2018-08-07T00:59:19Z
dc.date.issued2010
dc.identifier.urihttp://hdl.handle.net/11122/9059
dc.descriptionThesis (Ph.D.) University of Alaska Fairbanks, 2010
dc.description.abstractThe origin of chondrules (sub-millimeter inclusions found in stony meteorites) remains today an open question despite over century of examination. The age of these proto-solar relics shows a well defined cutoff of around 4.5 billion years ago. This places them as the oldest solids in the solar system. Chemical examination indicates that they experienced heating events on the order of 5000 K/hr for periods of around 30 minutes, followed by extending periods of cooling. Additional examination indicates the presence of large magnetic fields during their formation. Most attempts to explain chondrule formation in the proto-solar nebula neglect the existence of a plasma environment, with even less mention of dust being a charge carrier (dusty plasma). Simulations of magnetic reconnection in a dusty plasma are forwarded as a mechanism for chondrule formation in the proto-solar nebula. Here large dust-neutral relative velocities are found in the reconnection region. These flows are associated with the dynamics of reconnection. The high Knudsen number of the dust particles allows for a direct calculation of frictional heating due to collisions with neutrals (allowing for the neglect of boundary layer formation around the particle). Test particle simulations produce heating equivalent to that recorded in the chondrule mineral record. It is shown that magnetic reconnection in a dusty plasma is of fundamental importance to the formation of the most primitive solids in the solar system.
dc.subjectPlasma physics
dc.subjectAstrophysics
dc.subjectTheoretical physics
dc.titleMagnetic Reconnection As A Chondrule Heating Mechanism
dc.typeThesis
dc.type.degreephd
dc.identifier.departmentDepartment of Physics
dc.contributor.chairWiechen, Heinz
refterms.dateFOA2020-03-05T16:41:55Z


Files in this item

Thumbnail
Name:
Lazerson_S_2010.pdf
Size:
1.955Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record