Free solar-terrestrial data displayed on your web page or site, updated every 3-hours。该站点由小飞收录，提供优质友链优质资源展示配套服务。Also contains solar and radio propagation information applicable to ham radio including solar conditions, space conditions, online propagation tool, online SN to SFI/SFI to SN conversion tool, online Aurora/Auroral activity to latitude conversion tool, and online K-Index to Signal Noise conversion tool。通过定期投资于指数基金，那些门外汉投资者都可以获得超过多数资深投资大师的业绩