Abstract
ABSTRACT 1 Institute of Space Science, National Central University, Chung-Li, Taiwan, ROC 2 Department of Physics, National Central University, Chung-Li, Taiwan, ROC * Corresponding author address: Prof. Lin-Ni Hau, Institute of Space Science, National CentralUniversity, Chung-Li, Taiwan, ROC; E-mail: lnhau@jupiter.ss.ncu.edu.tw doi: 10.3319/TAO.2007.18.4.843(AA) Worldwide ground observations of upper atmospheric airglow withparticular emphasis on the OI 557.7 and 630 nm emissions have been con-ducted since 1960s. This study reports the first ground observations ofOI 557.7 nm green line emission over the Taiwan area. For comparison, thebackground continuum at 530 nm was also measured by the same system.The experiments were conducted during the period of Aug - Dec, 2004 atvarious locations in Taiwan using a self-developed photometer instrument.Daily height integrated intensity of the night-time green line emission mayvary in the range of 80 - 210 Rayleighs and twilight enhancement is alsoidentified. The observational results may serve as a useful reference forfollow-up sounding rocket measurements of OI 557.7 nm airglow emissionover the Taiwan area.(Key words: Airglow, OI 5577, Taiwan area, Ground observation)1. INTRODUCTION
Highlights
The observation of OI 557.7 nm airglow has been a primary information source for atomic oxygen variation in the atmosphere
We show a qualitative result of twilight enhancement from our preliminary ground observations of OI5577 emission over the Taiwan area
The statistical results of worldwide airglow observations during the International Geophysical Year and the International Geophysical Cooperation, 1957 - 1959, (Yao 1962) and other later statistical results obtained, for example, by Deutsch and Hernandez (2003) show that the intensities of OI5577 emissions may vary from ~20 to ~600 R
Summary
The observation of OI 557.7 nm airglow (hereafter referred to as OI5577) has been a primary information source for atomic oxygen variation in the atmosphere. A photomultiplier-based photometer is developed to conduct ground observation of OI5577 emission over the Taiwan area. Weinberg and Mann (1967) of the University of Hawaii conducted the first systematic sky-scanning measurements of OI5577 airglow and other wavelength bands at Mt. Haleakala Maui, Hawaii (geographic longitude of 156.6°N and latitude of 20.7°N, and altitude of 3033 m) in the early 1960s to provide a basic reference database for balloon, rocket and satellite observations. We show a qualitative result of twilight enhancement from our preliminary ground observations of OI5577 emission over the Taiwan area
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