The Relativity between Season Anomaly of Ionoshpere and Solar Activity in Taiwan

• Main Authors: Shih-Ming Chuang, 莊適銘
• Other Authors: Jann-Yenq Liu
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/78559541283875350105

碩士 === 國立中央大學 === 太空科學研究所 === 92 === Taiwan is right under the equatorial ionization anomaly, EIA, region, and therefore it yields the greatest value in the critical plasma frequency foF2 of the world. This research examines solar activity variations in the foF2 recorded in Taiwan. A statistical investigation of the foF2 during the solar cycle 21 and 22 reveals that the foF2 yields pronounced maximum values in the spring and fall during the post noon period. The appearance of the two maximum is approximately proportional to the diurnal variations of the foF2. Meanwhile, the appearance of the two maximum is found to be in proportional to the solar activity and the yearly mean of the foF2. Variation of the maximum value in the spring and fall, and the minimum value in the winter are similar to those of the solar activity except the summer. Difference between the extreme generally are proportional to the solar cycle variation, expect between spring and winter as well as fall and winter. The appearance dates of the extreme seem not to be a function of the solar activity.