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Proposal Identication No.: P1372 Date Received: 1999-Oct-01 15:32:02
Technical Page
Proposal Type: Regular
General Category: Pulsars
Sub-Category: Continuum
Observation Category: Galactic
Total Time Requested: 12.5 Hours
Proposal Title: The Nonlinear Dynamics of Drifting Subpulses
ABSTRACT:
Approximately 30 pulsars are known to exhibit the intriguing phenomenon of drifting subpulses. One of
the out-standing and important unanswered questions regarding subpulse drift is whether the variation in
drift rate seen for some of these pulsars is due to changes in the physical conditions governing the radio
emission. We hypothesize that in general subpulse drift is governed by nonlinear dynamics; that variable
drift is the norm rather than the exception and is a result of those dynamics under stable physical
conditions. As an initial test we propose observations of PSR J2018+2839 at 430 MHz to search for
evidence of low-dimensional chaotic drift. If detected, the implication of a stable physical environment at
the pulsar would provide an important constraint for theories of subpulse drift, the pulsar magnetosphere
and the emission mechanism. To investigate the frequency dependence of the dynamics we also propose a
one-hour observation at 1720 MHz.
Name Institution E-mail Phone Student
Matthew D Young University of West-
ern Australia
matthew@physics.uwa.edu.au 61-8-9380-1330 G
Instrument Setup
L-wide 430 CH receiver
Atmospheric Optical Instruments:
Special Equipment or setup: We plan to use the AOFTM at both frequencies and possibly the
WAPP at 1720 MHz if it is available. With regard to the AOFTM, we do not have a mammoth tape
drive at our institution and will need to transfer the data to another tape format prior to leaving the
observatory.
RFI Considerations
Frequency Ranges Planned
425-435
1715-1725
This proposal requires coordination with AFTWF within the band 425-435 MHz.
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