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注册: 2011-11-01
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专业: 凝聚态物性 II ：电子结构

[求助] 关于电离层临界频率，大家可不可以帮我翻译下。

The ionosphere varies greatly due to changes in the  sources of ionization  and because it responds to  changes in the neutral part of the upper atmosphere  in which it is embedded. Since it responds to solar EUV radiation the  ionosphere varies in the 24-hour  period between daytime and nighttime and over the 1 I-year cycle of solar activity.
   In the study of the ionosphere,  foF2 is taken as the main parameter  that  reflects  the  ionospheric variations as the densest  ionization occurs in this layer. One of the most important  quantities in High Frequency  (HF) u"nications  is the maximum usable  frequency or MUF, which is the  maximum frequency that will be reflected by the ionosphere
for a given circuis and is closely  related to foF2.  In rlds.paper we will investigate the behavior of foF2 values ~vhich can  characterize  well  the  F-region morphology over the equatoAl region  and of the relation to  the  solar activity. To study the  foF variation in the ionosphere in the equatorial region. we employed the  ionosonde  data  for Singapore
from  1957 to 1971 from National  Geophysical  Data Center,  NOAA  (Space Physics  Interactive  Dat  Resource,  SPIDR for short). The data analysis is presented and summarized in the following sections. Section 2 presents the discussion of the relationship  between the Sun Spot Number  (SSN) and the foF2. In  section  3,  the  teniporal  variations  of  the  ionosphere  are  investigated.  Conclusions  and  discussions are made in the last section.

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