摘要
"极区电急流天线"辐射依赖于低电离层D/E区背景电急流,而高电离层F区极低频调制加热,可产生抗磁性电流,形成极低频波辐射源。利用电离层F区一维时变加热数值模型,采用全波解算法研究高纬Troms(69.59°N,19.23°E)地区电离层F区极低频调制加热。模拟结果表明,极区高电离层激发的极低频波与极区低电离层激发的结果不同。加热泵波的有效辐射功率(effective radiated power,ERP)、调制频率及电离层背景对极低频波强度有着重要影响。
Polar ionospheric heaters operated by HARRP and EISCAT have generated extremely low frequency waves by modulating the auroral electrojet at D and E region altitudes .However , the auroral electrojet often varies over time and is not always present .Alternatively, modulated F-region HF heating can generate ionospheric diamagnetic cur-rent, and the periodic modulation results in a magnetic moment that radiates extremely low frequency waves .Based on a one-dimensional time physical model of polar ionospheric heating and a full-wave model , we analyzed the fea-tures of extremely low frequency waves over TromsФ（69.59°N, 19.23°E）.The results showed that extremely low frequency waves on the ground are different from lower ionospheric modulation , i.e., radiation of polar electrojet antenna.Furthermore, effective radiated power （ERP）, modulated frequency, and ionospheric background, have significant influence on the generated extremely low frequency wave .
出处
《极地研究》
CAS
CSCD
北大核心
2014年第3期316-323,共8页
Chinese Journal of Polar Research
基金
国家自然科学基金(41004066,41004065,41104108)
国家国际科技合作专项(2011DFA22270)资助
关键词
电离层加热
抗磁性电流
极低频波
极区电急流
ionospheric heating
diamagnetic current
extremely low frequency waves
polar electrojet
