Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/MeiseltagT2084tp.ps Дата изменения: Thu May 12 18:52:28 2005 Дата индексирования: Sat Dec 22 22:05:17 2007 Кодировка: Поисковые слова: dust

Proposal Identification No.: T2084 Date Received: 2005­Jan­31 10:52:36
Technical Page
Proposal Type: Long­term
General Category: Terrestrial Aeronomy
Sub­Category: Radar
Observation Category: Solar System
Total Time Requested: 24h over 3 days/yr Hours
Proposal Title: Studies of A Newly Discovered Asteroidal Dust Steam
ABSTRACT:
During UHF radar observations 2001 Feb 23­25, a velocity spike at 20.4 km/s was seen with the LF antenna. The
micrometeors with this narrow velocity range were detected mainly in the 8­12 UTC period each day. Orbital
analysis of 102 events out of some 19,000 total for the run has revealed that these micrometeors in the 0.1 to 150
micron size range were on elliptical paths that would classifiy them as belonging to the Aten asteroid family ( the
micrometeor stream peaks in the orbital element distribution at a=0.64 AU and e=0.54). No obvious progenitor
has been found as yet, but since the particles are in a nearly earth­moon synchronous orbit, the rquired
perturbation program will require special modification to take all the factors into account. More observations of
this stream are needed to unravel all the various visibility factors and none of the other observing times alloted
covered this same period in subsequent years. Radar time for 2006 and 2007 Feb 23­24 is requested covereing at
least 6­14 hours UTC each day.
Name Institution E­mail Phone Student
David D. Meisel SUNY­Geneseo meisel@geneseo.edu 585­245­5282 no
Service Observing Request Remot e Observing Request
X None X No
All of the observing run. Maybe
Part of the observing run. Yes
Queue Observing
Instrument Setup
430 CH receiver 430 CH radar
Atmospheric Observation Instruments:
Special Equipment or setup: If available, we plan to use the 430 MHz interferometer instead of the
Gregorian. If the interferometer is not available then the Greg feed will be used.
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RFI Considerations
Frequency Ranges Planned
2