發送短信

數:

提供者:

CAPTCHA:

  ______    ______   _    _      ___     _    _   
 /_____//  /_   _// | |  | ||   / _ \\  | |  | || 
 `____ `    -| ||-  | |/\| ||  | / \ || | |/\| || 
 /___//     _| ||_  |  /\  ||  | \_/ || |  /\  || 
 `__ `     /_____// |_// \_||   \___//  |_// \_|| 
 /_//      `-----`  `-`   `-`   `---`   `-`   `-` 
 `-`

Please enter what you see:

發送短信 : Ionospheric peak height at the magnetic equator: Comparison between ionosonde measurements and IRI