Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/MathewstagT1461tp.ps Дата изменения: Mon Apr 19 19:59:37 2004 Дата индексирования: Sat Dec 22 22:43:04 2007 Кодировка: Поисковые слова: ngc 4736

T1461 2000-May-30 21:13:17
Technical Page
Proposal Type: Regular
General Category: Terrestrial Aeronomy
Sub-Category: Radar
Observation Category: Ionosphere
Total Time Requested: 84 Hours
Proposal Title: Dual-Beam Scanning Studies of E- and F-Region Small-Scale Structures
ABSTRACT:
Recent high (time/range) resolution, azimuth-scanning (beam-swinging) ISR observations of the evening and
nighttime E- and F-regions at Arecibo have revealed signicant small-scale horizontal structure over the entire
altitude region. Much of this structure appears to be electrodynamic in origin involving low-lying tidal ion layers,
ion-rain, and the spread-F instability process. In particular, numerical simulations demonstrate the formation of
horizontally thin, parallel sheets of ionization in a (non-vertical) plane oriented transverse to the bulk ow of the
F-region that sweeps ~ 1 mV/m amplitude E-elds quasi-periodically through a xed location in the E-region.
Surprisingly, ionization sheets have been observed in the 85-100 km altitude region (see narrative). We propose
continued azimuth-scanning (beam-swinging) observations using the new dual-beam ISR observing mode in order
to better understand horizontal structuring and the formation of ionization sheets in particular. Several
observational modes are described in the narrative.
Name Institution E-mail Phone Student
John D Mathews Penn State Un. JDMathews@psu.edu 814-865-2354 no
I NA want to do remote observing.
Instrument Setup
430 CH radar
Atmospheric Optical Instruments:
Special Equipment or setup: This proposal is to use the new 430 MHz dual-beam radar system. We
require the hardware/software modications to use this system including the 88 baud code system. The
data-taking/recording system needs to be modied such that the whole F-region is included. This would
double the current capability of this system. Qihou Zhou can assist in specications.
RFI Considerations
Frequency Ranges Planned
This proposal requires coordination with AFTWF within the band 425-435 MHz.
1