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Proposal Identication No.: T2961 Date Received: 2014-May-11 14:16:48
Technical Page
This proposal has not been submitted before.
Proposal Type: Regular
General Category: Terrestrial Aeronomy
Observation Category: Ionosphere
Total Time Requested: 110 Hours
Minimum Useful Time: 11
Proposal Title: Solve the puzzle of what excites night-time plasma lines. (cover sheet was assigned
ID 140508170733.0)
ABSTRACT:
The incoherent scatter radar (ISR) plasma line (PL) during the daytime is excited by photoelectrons (Perkins and
Salpeter, 1965). Measure of its intensity (kTp) has been used for their study since the earliest days of ISR
(Yngvesson and Perkins, 1968; Cicerone, 1974). At night in the absence of any other excitation mechanism the PL
intensity should have a thermal amplitude level kTe, determined by the electron gas temperature Te. To the
contrary Carlson found the nighttime PL over Arecibo was enhanced 3-10 times above thermal level intensities
despite the absence of any known causative mechanism (e.g. Carlson et al, 1982). That remains true now (gure 2
herein). This proposal is to solve the puzzle of why. Benets can include adding a new user Arecibo community
once the new excitation mechanism is discovered, and we hope to enable future auto-self calibration of world day
runs 24 hours/day.
Name Institution E-mail Phone Student
Herbert c Carlson Utah State Univer-
sity
herbert.c.carlson@gmail.com 1 435 760 1831 no
Remote Observing Request
X Observer will travel to AO
Remote Observing
In Absentia (instructions to oper-
ator)
Instrument Setup
430 G
Atmospheric Observation Instruments:
1

Special Equipment or setup: none
RFI Considerations
Frequency Ranges Planned
2