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Proposal Identification No.: T2134 Date Received: 2005­Jun­02 18:29:01
Technical Page
Proposal Type: Regular
General Category: Terrestrial Aeronomy
Sub­Category: Radar
Observation Category: Ionosphere
Total Time Requested: 96 Hours
Proposal Title: E region seasonal observations of Ion­Neutral Collision frequencies using plasma
and ion line measurements
ABSTRACT:
It is proposed to measure the seasonal variation of the ion­neutral collision frequency in the E region using
simultaneous ion and plasma line measurements. For this purpose, it is intended to use the Arecibo 430 ”
MHz line
feed in a coded long­pulse (CLP) mode and receive the returned signal using the recently developed digital
receivers to sample the ion and plasma line spectra simultaneously. With the ion and plasma line information
derived from the observations, the number of estimated variables in the nominal least square fitting procedure is
reduced. Consequently, better estimates are expected to be obtained from this fitting. The ion­neutral collision
frequency is an important parameter from which conductivities and electric currents can be derived. At Arecibo,
these measurements have been limited because of the low SNR (few electrons) at the E region and the fitting
procedure that involves the electron density, electron and ion temperatures, and ion­neutral collision frequency to
be fitted at the same time. It is expected that the additional information from plasma line allows better estimates
of these ionospheric parameters.
Name Institution E­mail Phone Student
Jose R Fernandez Arecibo Observatory jfernand@naic.edu 787 878­2612 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 radar
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
2