div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=causes-of-lonisation-in-the-upper-atmospherehtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Causes of lonisation in the Upper Atmosphere loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentssitereader031viewer2022020405575067cc1a28ab0f07ad32edhtml5thumbnails1jpg width=140 height=200 divp© 1932 Nature Publishing Grouppdiv