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Proposal Identification No.: T1935 Date Received: 2004­Feb­02 15:17:11
Technical Page
Proposal Type: Regular
General Category: Terrestrial Aeronomy
Sub­Category: Radar
Observation Category: Ionosphere
Total Time Requested: 96 Hours
Proposal Title: Measuring F1 region ion composition with plasma and ion line observations
ABSTRACT:
We propose to use the Arecibo 430 MHz dual­beam radar to unambiguously measure the ion composition in the F1
region. This parameter is not only important for understanding the chemistry of the F1 region, but it is also
needed to analyze ISR ACFs to determine electron and ion temperatures from that region. Currently at Arecibo,
we assume a fixed model for the height variation of the F1 region ion composition, in order to deduce electron and
ion temperatures from the ISR ACFs. Since the model is the same for all times, the temperatures obtained in such
fashion could deviate significantly at times from their actual values. With recent additions to the hardware used for
aeronomy experiments (e.g., new digital receivers, the 1 terabyte datataking system, a 3 terabyte data processing
server) and the wide bandwidth gregorian radar, we will be able to measure this parameter routinely during the
day. The technique to do the measurement is based on the combination of simultaneous plasma and ion line
components of the ISR spectrum. While similar ideas have been used before (see next section), the experiment we
are planning combines all the information in a novel way, as we will fit new MRACF ion line data (a function of
N e ,T e ,T i , ion composition) along with the frequency information from the coded long­pulse (CLP) plasma line data
(a function of N e , T e and the magnetic field) to determine temperatures and ion composition in a self consistent
way. This approach will provide very accurate measurements in a very short time (less than 1 minute), with the
possibility of incorporating this new mode to regular ISR observations.
Name Institution E­mail Phone Student
Nestor Aponte Arecibo Observatory naponte@naic.edu 787­878­2612
Ext. 362
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
1

Atmospheric Observation Instruments:
Ionosonde
Special Equipment or setup: This proposal is for a dual­beam experiment, so it will require the
gregorian 430 MHz radar.
RFI Considerations
Frequency Ranges Planned
420­440
This proposal requires coordination with AFTWF within the band 425­435 MHz.
2