Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/WaldroptagT2042tp.pdf Дата изменения: Mon Feb 28 17:53:44 2005 Дата индексирования: Sat Dec 22 23:08:40 2007 Кодировка: Поисковые слова: с р р с с п п р п п с с с р р р р р п п р р р п п р

Proposal Identification No.:

T2042

Date Received:

2005-Jan-12 14:35:48

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Urgent Terrestrial Aeronomy Radar Ionosphere 36 Hours

Helium Ion Layer Formation During Equinox

The advent of improved light ion partitioning in the analysis of Arecib o Observatory Incoherent Scatter Radar (ISR) data has led to a renewed interest in the measurement and study of He+ ions. A recent climatological investigation of He+ ion layers observed in the topside ionosphere by the Arecib o ISR over the past 10 years has revealed a surprising seasonal dep endence of layer formation and strength that suggests solar pro duction of He+ ions may have less influence on layer strength than previously b elieved. Sp ecifically, the few topside He+ layers observed very near equinox exhibit significantly different b ehavior than those observed during other seasons. To investigate the p otential roles of the neutral wind and electric field on this unusual phenomenon, we urgently prop ose measurements of the night-time topside ionsphere during the March 2005 equinox p erio d utilizing the new dual-b eam capability of the 430 MHz transmitter. This system would allow the first simultaneous measurements of three ion comp osition together with multi-dimensional vector velo cities, providing a significant improvement to the quality of the existing data set and directly addressing the op en questions regarding the physical influences on He+ layer formation.

Name Lara S Waldrop

Institution University of Illinois at UrbanaChampaign

E-mail lwaldrop@uiuc.edu

Phone 217-244-5129

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 Atmospheric Observation Instruments: 1


Sp ecial Equipment or setup: This pro ject would benefit greatly from use of the new dual-beam 430 MHz transmission system and likewise provides an excellent oppotunity for its futher required testing. The requested nighttime interval complements dual beam experiments currently scheduled for the daytime in March.

RFI Considerations Frequency Ranges Planned

2