... The ring current (e.g., Frank, 1967) consists of geomagnetically trapped 10 - 200 keV ions (mainly H + , He + , and O + ) and electrons that drift azimuthally around the Earth at radial distances of about 2-7 Re (Earth radii), overlapping the radiation belt region. ... This index can be used to monitor the development of geomagnetic storm (see also geomagnetic activity ), as the main signature (actually definition) of the storm main phase is the build-up of an enhanced ring current. ... Res., ...

... Now and then it experiences a magnetic storm , a disturbance of the magnetic field observable all around the globe, lasting a few days and adding appreciably to the Earth's trapped plasma. The storm is accompanied by large bright auroral displays, often extending well beyond the auroral zone, a rare spectacle for those not used to it. ... After analyzing them with a network of four stations, he concluded that they came from large electric currents flowing along the auroral arcs. ...

... Voyager 1 completed its Jupiter encounter in early April, after taking almost 19,000 pictures and many other scientific measurements. ... Its outer edge is 129,000 kilometers (80,000 miles) from the center of the planet, and, though the brightest portion is only about 6,000 kilometers (4,000 miles) wide, ring material may extend another 50,000 kilometers (30,000 miles) downward to the top of Jupiter's atmosphere. ... Jupiter Space History The Voyager Planetary Mission Voyager Saturn Science Summary ...

Cosmic Research, Vol. 42, No. 5, 2004, pp. 435­488. Translated from Kosmicheskie Issledovaniya, Vol. 42, No. 5, 2004, pp. 453­508. Original Russian Text Copyright © 2004 by Veselovsky, Panasyuk, Avdyushin, Bazilevskaya, Belov, Bogachev, Bogod, Bogomolov, Bothmer, Boyarchuk, Vashenyuk, Vlasov, Gnezdilov, Gorgutsa, Grechnev, Denisov, Dmitriev, Dryer, Yermolaev, Eroshenko, Zherebtsov, Zhitnik, Zhukov, Zastenker, Zelenyi, Zeldovich, Ivanov-Kholodnyi, Ignat'ev, Ishkov, Kolomiytsev, Krasheninnikov, Kudela,