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Proposal Identification No.:

T2027

Date Received:

2004-Oct-01 13:11:04

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT:
We have theoretically demonstrated that the radio signals at 40.75 kHz, emitted from the Naval (NAU) transmitter in Puerto Rico, can effectively interact with the radiation b elts and ionospheric plasmas over Arecib o, after they are guided by naturally o curring ionospheric ducts during "spread F events". These intense NAU radio waves, after entering the ionosphere in the form of whistler waves, can interact with ionospheric plasmas and excite lower hybrid waves and tens of meter-scale field-aligned plasma density irregularities over Arecib o. The subsequent heating of electrons and ions by the lower hybrid waves is exp ected to yield a chain of ionospheric plasma effects, such as airglow, short-scale density depletion, and enhanced plasma lines in a broad range of altitudes. The NAU 40.75 kHz whistler waves continuing propagation into the radiation b elts at L = 1.35 can interact with lo cal charged particles, causing energetic particle precipitation and then pro ducing anomalous ionization layers and airglow in the lower ionosphere over Arecib o. We prop ose to carry out Arecib o exp eriments this winter for 10 days by a team of MIT graduate students and undergraduate students, led by the Principal Investigator: Prof. Min-Chang Lee in collab oration with the co-Principal Investigator: Dr. Michael P. Sulzer of Arecib o Observatory to test the theories. In addition to Arecib o 430 MHz radar and ionosonde, we will deploy MIT's All-Sky Imaging System (ASIS), VLF/LF and HF receiving systems for the exp eriments.

Urgent Terrestrial Aeronomy Radar Ionosphere 80 Hours

Guided Whistler Wave Propagation and Interactions with Ionospheric Plasmas during Spread F Events

Name Min-Chang Lee

Institution Massachusetts Institute of Technology

E-mail MCLEE@MIT.EDU

Phone 617-253-5956

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 Description of Observer Equipment: MIT All Sky Imaging System (ASIS), VLF/HF/VHF receiving systems Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
N/A

2