NDLI: 20. The ablation of solid meteoroids

Please wait, while we are loading the content...

20. The ablation of solid meteoroids

Content Provider	Scilit
Author	Kaiser, T. R. Jones, J.
Copyright Year	1968
Abstract	Ablation profiles for compact meteoroids have been obtained which take account of the effects of thermal radiation, conduction, meteoroid heat capacity and deceleration, while retaining the simplifying assumption that the onset of massive ablation occurs at a well-defined temperature.The dependence of the air density, ρa, at the onset of ablation on the initial meteoroid radius, $R_{0}$, is in agreement with the results of Ceplecha and Padevět (1961). For a meteoroid of given composition, velocity and zenith angle there are four critical values for the radius, $R_{1}$, $R_{2}$, $R_{3}$ and $R_{4}$. $R_{1}$ is the micrometeorite limit such that if $R $R_{3}$ the meteoroid develops a marked thermal gradient and, if it is brittle, will fragment before ablation commences. The smallest fragments will ablate at the air density $ρ_{a1}$, which is shown to be close to the experimental result of Jacchia et al. (1967) for photographic meteors. If such a particle survives fragmentation, the molten droplet will fragment due to distortion if R > $R_{4}$ (Lebedinec and Portnjagin, 1966); it is shown that $R_{4}$ is not substantially different in magnitude from $R_{3}$. Meteoroids in the size range $R_{2} $R_{1}$ will make negligible contribution to the micrometeorites reaching the Earth's surface, except, perhaps, where a significant proportion of the mass of larger meteoroids fragments into particles with radius less than $R_{1}$. By neglecting deceleration, it is possible to arrive at an analytic expression for the ablation profile; this is found to be in good agreement with the computed profiles except for particles near to the micrometeorite limit.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/EBC9BEFE93CE6D10BDB7CA3762134378/S007418090001977Xa.pdf/div-class-title-20-the-ablation-of-solid-meteoroids-div.pdf
Ending Page	205
Page Count	1
Starting Page	205
ISSN	00741809
DOI	10.1017/s007418090001977x
Journal	Symposium - International Astronomical Union
Volume Number	33
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	1968-01-01
Access Restriction	Open
Subject Keyword	International Astronomical Union Astronomy and Astrophysics Initial Meteoroid Meteoroid Heat Capacity
Content Type	Text
Resource Type	Article

Central Library (ISO-9001:2015 Certified)
Indian Institute of Technology Kharagpur
Kharagpur, West Bengal, India | PIN - 721302

See location in the Map
03222 282435
Mail: support@ndl.gov.in

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in