Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/DjuthtagT2634tp.pdf Дата изменения: Thu Feb 10 23:52:33 2011 Дата индексирования: Mon Feb 4 19:39:37 2013 Кодировка: Поисковые слова: m 2

Proposal Identification No.:

T2634

Date Received:

2011-Feb-04 15:16:17

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT:
Recently it has become evident that a background of AGWs is continuously present in the Arecibo thermosphere [e.g., Djuth et al., 2010; Djuth et al., 2004]. Very high-resolution electron density measurements obtained by applying the coded long-pulse (CLP) radar technique to photoelectron-enhanced Langmuir waves has allowed us to make very detailed measurements of the Arecibo gravity waves. The nominal apparent period of the AGWs is 50-60 min at 240-250 km altitude. Apparent periods of 20-30 min are also evident at lower attitudes (below about 170 km altitude). In addition, small oscillations having periods near the Brunt-Vaisala period are observed below about 220 km altitude. The focus of the proposed observation is on making simultaneous CLP observations along with radar measurements of background neutral winds so that intrinsic periods can be deduced. Other phenomena that benefit from the neutral wind study include the secular increase in the period above 145 km during the morning and the change between 165 and 235 km altitude from morning to afternoon. Finally, as part of the observing program we plan to add to our limited radar database involving the direction-of-arrival of the Arecibo AGWs.

Regular Terrestrial Aeronomy Radar Thermosphere 36 Hours 9 hours

Simultaneous Neutral Wind and High-Resolution Acoustic Gravity Waves Measurements at Arecibo

Name Frank T Djuth

Institution Geospace Research, Inc.

E-mail fdjuth@geospace-research.com

Phone 310-727-9528

Student no

Remote Observing Request

X

Observer will travel to AO Remote Observing In Absentia (instructions to operator)

Instrument Setup
430 CH radar Atmospheric Observation Instruments: 1


Ionosonde Sp ecial Equipment or setup: The proposal calls for simultaneous radar transmissions from both the line feed and Gregorian feed.

RFI Considerations Frequency Ranges Planned

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