Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/StinebringtagP1837tp.ps Дата изменения: Mon Apr 19 20:00:20 2004 Дата индексирования: Sat Dec 22 23:48:43 2007 Кодировка: Поисковые слова: south pole

Proposal Identication No.: P1837 Date Received: 2003-Jun-04 12:52:24
Technical Page
Proposal Type: Regular
General Category: Pulsars
Observation Category: Galactic
Total Time Requested: 84 Hours
Proposal Title: Variable Substructure in Pulsar Scintillation Arcs
ABSTRACT:
Scattering of pulsar radio waves has many observable consequences and has proven a powerful tool for exploring
the ionized interstellar medium on a range of size scales. Several years ago we found a new scattering phenomenon,
now called scintillation arcs, which shows up as a parabolic feature in the secondary spectra of pulsars. We have
explored the scintillation arcs further and found numerous occasions when the arcs show time variable
substructure. This substructure, which often times takes the form of inverted subarcs with the same absolute value
of curvature, persists for longer than a day but less than a month. Since they involve scattered rays far from the
core of the image, scintillation arcs probe ISM structures that are up to 20 times larger than previous scintillation
studies. We propose observations of four pulsars over a three week period in order to explore the time variability of
scintillation arc substructure.
Name Institution E-mail Phone Student
Daniel R Stinebring Oberlin College dan.stinebring@oberlin.edu 440-775-8331 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 G 610 L-wide S-low 327
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
1

Frequency Ranges Planned
322 - 332
425 - 435
1125 - 1225
1350 - 1550
2000 - 2300
This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz..
This proposal requires coordination with GPS L3 at 1381 MHz.
This proposal requires coordination with AFTWF within the band 425-435 MHz.
2