IONOSPHERE
| Date | Clue |
|---|---|
| 2015-09-18 | Bouncer of radio signals |
| 2013-04-19 | It reflects radio waves |
| 2011-08-01 | Where the Northern Lights occur |
| 2003-01-03 | Radio wave reflector |
| Date | Clue |
|---|---|
| 2015-09-18 | Bouncer of radio signals |
| 2013-04-19 | It reflects radio waves |
| 2011-08-01 | Where the Northern Lights occur |
| 2003-01-03 | Radio wave reflector |