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Proposal Identification No.: T2318 Date Received: 2007­Feb­01 22:40:21
Technical Page
Proposal Type: Regular
General Category: Terrestrial Aeronomy
Sub­Category: Radar
Observation Category: Ionosphere
Total Time Requested: 80 Hours
Minimum Useful Time: 5 hours
Proposal Title: Multi­diagnoses of processes leading to ionospheric plasma line enhancement
ABSTRACT:
Based on Arecibo experiments carried out in late December of 2005 and early January of 2006, we have found
possible processes leading to two types of plasma line enhancement. These processes were caused by 40.75 kHz
whistler modes, originating from Naval transmitter located in Puerto Rico. Direct interactions of 40.75 kHz
whistlers with ionospheric plasmas can excite lower hybrid waves to accelerate electrons and, subsequently, yield
enhanced plasma lines with rather broad frequency spectra. In contrast, whistler waves propagating from the
ionosphere into magnetsophere will interact and precipitate trapped energetic electrons from the inner radiation
belts into the lower ionosphere, generating enhanced plasma lines with realtively narrow frequency spectra. As
outlined in the attached proposal, several students have developed thesis research plans for further experimetal and
theoretical investigation of these intriguing phenomena. For optimum optical diagnoses, it is highly desirable to
conduct experiments during the new moon period.
Name Institution E­mail Phone Student
Min­Chang Lee MIT mclee@mit.edu 617­253­5956 no
Remote Observing Request
X Observer will travel to AO
Remote Observing
In Absentia (instructions to oper­
ator)
Instrument Setup
430 CH radar
Atmospheric Observation Instruments:
Fabry­Perot Ionosonde Lidar
Description of Observer Equipment: MIT All Sky Imaging System and VLF/LF Receiving System.
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Special Equipment or setup: None
RFI Considerations
Frequency Ranges Planned
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