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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Scientists will investigate ionosphere mechanisms that cause optical emissions.
Source: https://phys.org/news/2023-11-haarp-artificial-airglow-widely-visible.html
Therefore, the model needs to be revised to account for these fast atmospheric waves in the ionosphere."
Source: https://phys.org/news/2023-05-eruption-tonga-underwater-volcano-disrupt.html
Unlike FM band stations, which are limited to line-of-sight reception by the laws of physics, lower-frequency AM signals bounce off the ionosphere after sunset, giving them a range of hundreds and sometimes thousands of kilometers.
Source: https://alaska-native-news.com/am-radio-fights-to-keep-its-spot-on-us-car-dashboards/69173/