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Proposal Identification No.:

T2211

Date Received:

2006-Jan-31 16:02:52

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: Regular Terrestrial Aeronomy Radar Ionosphere 32 Hours

High-resolution electron temperature measurements using the plasma line asym-

metry
ABSTRACT:
We propose to use the Arecibo 430 MHz incoherent scatter radar (ISR) to measure both the up-shifted and down-shifted ionospheric plasma lines using the modern coded long pulse (CLP) technique. While measurements of one side of the spectrum have been made, no attempts have been to measure both the up-shifted and down-shifted frequencies simultaneously with the CLP method. The CLP method allows one to obtain very good altitude resolution (up to 75 meters), very good time resolution (near 10 seconds), and very good spectral resolution for making these measurements. The usefulness of measuring both the up- and down-shifted lines comes from the fact that the difference between those frequencies is proportional to a term involving the electron drift velocity and a term involving the electron temperature. Thus, given information about the electron drift velocity, one can extract the electron temperature from this technique. This method will give unprecedented altitudinal and temporal resolution for measurements of the electron temperature. In addition, when combined with zero-lag ion line measurements and the high resolution density measurements obtainable from the plasma line frequency, we will be able to estimate both the electron and ion temperatures with no information about the shape of the ion-line spectrum itself. The ion composition (specifically the molecular ion fraction) can then be obtained from the ion line spectrum in the F1 region with no temperature ambiguity and on a height-by-height basis. While the focus of our efforts is on the molecular ion fraction, the technique, if successful, can be used for other F region studies where knowing the electron and ion temperatures with very high resolution is desired.

Name Michael J Nicolls

Institution Cornell University

E-mail mjn25@cornell.edu

Phone 607-255-9070

Student G

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
1


430 G

430 CH receiver 430 CH radar

Atmospheric Observation Instruments: Ionosonde Sp ecial Equipment or setup: Need 430 MHz Gregorian transmitter (dual-beam) as well. Please see proposal for justification.

RFI Considerations Frequency Ranges Planned
415 - 445

2