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Proposal Identification No.: A1840 Date Received: 2005­Aug­08 13:44:32
Technical Page
Proposal Type: Urgent
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Solar System
Total Time Requested: 1 Hours
Proposal Title: Dynamic Spectra of Interplanetary Scintillation
ABSTRACT:
Dynamic spectra of pulsar interstellar scintillation appear to be ''random'' but actually have an underlying order
which is apparent only when a 2­D spectral analysis is performed on the dynamic spectra. This ''secondary''
spectrum often shows clear parabolic arcs (Stinebring and colleagues). The curvature of these parabolic arcs
depends only on the distance of the scattering material and its velocity. Although the pulsar observations are in
strong scattering the underlying phenomenon is more evident weak scattering (based on theory and full
electromagnetic simulations). We are interested in the potential of ''parabolic arc'' observations for the study of
the solar wind, particularly for transients such as coronal mass ejections. The curvature of an arc can be
determined from 10 s of observation, raising the possibility of observing dozens of sources in a very short time. This
would provide unprecedented resolution of the space­time structure of CME's in the interplanetary medium. We
have just discovered this possibility and would like to test the idea soon. It will not be possible at Arecibo after the
end of September, until the Sun comes above zero dec again in April.
Name Institution E­mail Phone Student
William A. Coles University of Califor­
nia at San Diego
bcoles@ucsd.edu 858 534 2703 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
L­wide
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
2