Effects of solar cycle variations on oxygen green line emission rate over Kiso, Japan

被引：9

作者：

Das, Uma ^{[1
]}

Pan, C. J. ^{[1
]}

Sinha, H. S. S. ^{[2
]}

机构：

[1] Natl Cent Univ, Inst Space Sci, Jhongli 32001, Taiwan

[2] Phys Res Lab, Ahmadabad 380009, Gujarat, India

来源：

EARTH PLANETS AND SPACE | 2011年 / 63卷 / 08期

关键词：

Mesosphere; airglow; Hilbert-Huang Transform; solar cycle effects; 558 NM EMISSION; LOWER THERMOSPHERE; AIRGLOW EMISSION; UPPER MESOSPHERE; ATOMIC OXYGEN; SPRINGTIME TRANSITION; MIDLATITUDE AIRGLOW; DIURNAL-VARIATIONS; O(S-1) NIGHTGLOW; TIDAL INFLUENCE;

D O I：

10.5047/eps.2011.04.006

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A sixteen year long dataset of mesospheric OI 557.7 nm green line nightglow emission rate, measured over Kiso (35.79 degrees N, 137.63 degrees E), Japan using ground-based photometers is spectrally investigated using the Hilbert-Huang Transform (HHT). The spectrograms reveal the presence of semi-annual, annual and quasi-biennial oscillations in consonance with the results obtained from wavelet analysis in an earlier study. In addition, due to the use of the HHT, we have been able to investigate the very low frequency solar cycle variation in the emission rate. It is found that there is a significant solar cycle effect on the oxygen green line emission rate. The mean amplitude of variation is approximately 20% and it is also found that it is maximum at midnight. A correlation study between the means of the emission rate and the solar radio flux at 10.7 cm also shows that the effect of solar activity on the oxygen green line emission rate is maximum at midnight.

引用

页码：941 / 948

页数：8

共 29 条

[1] 5577 A AIRGLOW EMISSION MECHANISM [J].