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Detection of artificially generated ULF waves by the FAST spacecraft and its application to the ‘tagging’ of narrow flux tubes

first_img[1] Recently, Robinson et al. [2000] presented a brief report on the artificial generation of ULF waves by high power ionospheric modification and their subsequent detection by the Fast Auroral Snapshot ( FAST) spacecraft. The radio frequency “heating” facility at Tromso was employed to impose a 3-Hz modulation on the current system that constitutes the auroral electrojet, resulting in the injection of field-guided ULF waves into the magnetosphere. The electric and magnetic field signatures of the waves were detected directly by the FAST spacecraft. Furthermore, a signature in the downgoing field-aligned electron flux, also observed by the satellite, was postulated to have resulted from the interaction of the ULF waves with the upper boundary of the ionospheric Alfven resonator. This paper evaluates these results in the context of the prevailing ionospheric conditions during the experiment and discusses the significance of the substorm activity, which occurred during this interval. The technique of artificial ULF wave injection, which can be used to “tag” narrow flux tubes, could play an important part in overcoming mapping issues between ground-based and space-based observations of phenomena that couple the ionosphere and magnetosphere.last_img read more

Klopp reacts after Liverpool’s third defeat in four games

first_imgRead Also: Chelsea face uncertainty over Abraham injury“Nothing, it was always clear it would be difficult – it was always clear it was difficult. We did very well, but tonight not good enough in decisive moments and that’s what we have to accept.”Liverpool remain in pole position to lift the 2019/20 Premier League trophy, but will need to turn their tie against Atletico next week Wednesday around if they are to progress to the quarter-final stage of the Champions League.FacebookTwitterWhatsAppEmail分享 Loading… After the match, Klopp suggested that his team has not been as defensively astute in recent games as they have been for much of the season, and admitted they were just not good enough against Chelsea.“Look, it went our way for so long because we defended outstandingly,” he told LiverpoolFC.com.“Usually you don’t get a lot of chances against us and stuff like this, but now we have to admit that in the last three games – (maybe) four – we have conceded absolutely too many goals, that’s true.“From completely different situations, so it is not one problem, but we see it as well. I am not worried about the momentum – momentum is not something you get as a present, you have to get it to keep it.“We have always a chance to get it back. No, I am not concerned about the momentum, but it is football and we never thought it would be an easy season, it would be an easy period, it would be an easy game tonight. After Chelsea handed Liverpool their third defeat in four matches when they knocked them out of the FA Cup with a 2-0 win at Stamford Bridge on Tuesday night, manager Jurgen Klopp commented on his side’s concerning dip in form.Advertisementcenter_img Promoted ContentThe Very Last Bitcoin Will Be Mined Around 2140. Read MoreThe Highest Paid Football Players In The World10 Hyper-Realistic 3D Street Art By Odeith11 Most Immersive Game To Play On Your Table TopBest & Worst Celebrity Endorsed Games Ever Made12 Countries With Higest Technology In The World7 Facts About Black Holes That Will Blow Your MindBirds Enjoy Living In A Gallery Space Created For Them8 Things You Didn’t Know About CoffeeWho Is The Most Powerful Woman On Earth?7 Non-Obvious Things That Damage Your PhoneWhich Country Is The Most Romantic In The World? Prior to their loss to Atletico Madrid in the first leg of their UEFA Champions League round of 16 tie last month, Klopp’s team had been on an incredible run across all competitions, especially in the Premier League.However, Liverpool have now lost three of their past four matches, scoring just three times and conceding eight goals in what has been a worrying spell for the European champions.On Tuesday, Frank Lampard’s Blues kicked the Reds out of England’s oldest cup competition courtesy of strikes from Willian and Ross Barkley, ending their treble hopes in the process.last_img read more