Day: September 29, 2021

Gigantic Jet Lightning from Puerto Rico

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Have you ever seen a gigantic jet? They are extremely rare but tremendously powerful. Gigantic jets are a type of lightning discharge documented only this century that occur between some thunderstorms and the Earth’s ionosphere high above them. Pictured above is the middle and top of one such jet caught last week by a lightning and meteor camera from Puerto Rico, USA. The jet traversed perhaps 70 kilometers in just under one second. Gigantic jets are much different from regular cloud-to-cloud and cloud-to-ground lightning. The bottoms of gigantic jets appear similar in appearance to another type cloud-to-above strike called blue jets, while the tops appear similar to upper-atmosphere red sprites. Although the mechanism and trigger that causes gigantic jets is a topic of research, it is clear that the jets reduce charge imbalance between different parts of Earth’s atmosphere. A good way to look for gigantic jets is to watch a powerful but distant thunderstorm from a clear location. via NASA https://ift.tt/2ZuWzd1

Wikipedia article of the day for September 29, 2021

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Wikipedia article of the day is U-1-class submarine (Austria-Hungary). Check it out: Article-Link Summary: The two submarines of the U-1 class, U-1 and U-2, were built for the Austro-Hungarian Navy. Constructed according to an American design, they were launched in 1909. A diving chamber, wheels for traveling along the seabed, and other experimental features were tested extensively in sea trials. Their gasoline engines were replaced around the start of World WarΒ I over safety and efficiency concerns. The boats have been described by naval historians as obsolete by the time they were commissioned in 1911. Both submarines were mobilized briefly during the Balkan Wars, and otherwise served as training boats before 1915. From 1915 to 1918 they conducted reconnaissance cruises out of Trieste and Pola, though neither sank any enemy vessels during the war. Facing defeat in October 1918, the Austro-Hungarian government transferred the bulk of its fleet, including these submarines, to the newly formed State of Slovenes, Croats and Serbs to avoid having to hand its ships over to the Allied Powers.