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Åska

Uppslagsorden ”Dunder”&#;och ”Tordön” leder hit. För musikalbumet, se Dunder (musikalbum). För örlogsfartygen, se HMS Tordön.
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Åska (ålderdomligt även tordön, fornnordiska: þordyn) är elektriska urladdningar i jordens atmosfär som yttrar sig i ett uppflammande av ljus (blixt) och ett skarpt eller mullrande ljud (åskknallar, åskdunder, åskmuller).[1][2] Dessa elektriska urladdningar alstrar mycket stor värme under bråkdelar av en sekund, vilket gör att luften sätts i rörelse vilket är upphovet till åskmullret.

Åska förekommer i samband med cumulonimbusmoln (bymoln), men kan också förekomma i extremt sällsynta fall i cumulusmoln (vanliga stackmoln) och stratusmoln (dimmoln)[3]. Urladdningen i stackmoln blir oftast mycket större än i vanliga bymoln,[4] me

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    "" fryst vatten a lightning detection network for locating electromagnetic discharges in the atmosphere (lightning discharges) with VLF receivers based on the time of ankomst (TOA) and time of group ankomst (TOGA) method. We are a community of hållplats operators who send their data to the computing servers, programmers who develop and/or implement algorithms for locating and visualizing of sferic positions, and people who assist in any way to keep the system running. There fryst vatten no restriction on membership. All people who keep the network in operation are volunteers. There are no fees, terms and conditions, and no contracts. If a station stops pooling its data, the server stops providing the access to the raw data for the user of that station.

    The network consists of more than lightning receivers and some central processing servers. The sources of the signals we locate are in general lightning discharges. The abbreviation VLF (Very Low Frequency) refers to the frequency range of 3 to 30 kHz. The receiving stations approximately record one millisecond of each signal with a sampling rate of more than kHz. With the help of GPS receivers, the arrival times of the signals are registered with