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Proposal Identification No.:

T1935

Date Received:

2004-Feb-02 15:17:11

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Regular Terrestrial Aeronomy Radar Ionosphere 96 Hours

Measuring F1 region ion composition with plasma and ion line observations

We prop ose to use the Arecib o 430 MHz dual-b eam radar to unambiguously measure the ion comp osition in the F1 region. This parameter is not only imp ortant for understanding the chemistry of the F1 region, but it is also needed to analyze ISR ACFs to determine electron and ion temp eratures from that region. Currently at Arecib o, we assume a fixed mo del for the height variation of the F1 region ion comp osition, in order to deduce electron and ion temp eratures from the ISR ACFs. Since the mo del is the same for all times, the temp eratures obtained in such fashion could deviate significantly at times from their actual values. With recent additions to the hardware used for aeronomy exp eriments (e.g., new digital receivers, the 1 terabyte datataking system, a 3 terabyte data pro cessing server) and the wide bandwidth gregorian radar, we will b e 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 comp onents of the ISR sp ectrum. While similar ideas have b een used b efore (see next section), the exp eriment we are planning combines all the information in a novel way, as we will fit new MRACF ion line data (a function of Ne ,Te ,Ti , ion comp osition) along with the frequency information from the co ded long-pulse (CLP) plasma line data (a function of Ne , Te and the magnetic field) to determine temp eratures and ion comp osition in a self consistent way. This approach will provide very accurate measurements in a very short time (less than 1 minute), with the p ossibility of incorp orating this new mo de to regular ISR observations.

Name Nestor Aponte

Institution Arecibo Observatory

E-mail naponte@naic.edu

Phone 787-878-2612 Ext. 362

Student no

Service Observing Request

Remot e Observing Request

X

None All of the observing run. Part of the observing run. Queue Observing

X

No Maybe Yes

Instrument Setup
430 CH radar 1


Atmospheric Observation Instruments: Ionosonde Sp ecial Equipment or setup: This proposal is for a dual-beam experiment, so it will require the gregorian 430 MHz radar.

RFI Considerations Frequency Ranges Planned
420-440 This proposal requires coordination with AFTWF within the band 425-435 MHz.

2