NDLI: RING CURRENT DYNAMICS DURING THE 13–18 JULY 2000 STORM PERIOD

Content Provider	Springer Nature Link
Author	Jordava, V.K. Thorne, R.M. Farrugia, C.J. Dotan, Y. Fennell, J.F. Thomsen, M.F. Reeves, G.D. McComas, D.J.
Copyright Year	2001
Abstract	We study the development of the terrestrial ring current during the time interval of 13–18 July, 2000, which consisted of two small to moderate geomagnetic storms followed by a great storm with indices Dst=−300 nT and Kp=9. This period of intense geomagnetic activity was caused by three interplanetary coronal mass ejecta (ICME) each driving interplanetary shocks, the last shock being very strong and reaching Earth at ∼ 14 UT on 15 July. We note that (a) the sheath region behind the third shock was characterized by B $_{z}$ fluctuations of ∼35 nT peak-to-peak amplitude, and (b) the ICME contained a negative to positive B $_{z}$ variation extending for about 1 day, with a ∼ 6-hour long negative phase and a minimum B $_{z}$ of about −55 nT. Both of these interplanetary sources caused considerable geomagnetic activity (Kp=8 to 9) despite their disparity as interplanetary triggers. We used our global ring current-atmosphere interaction model with initial and boundary conditions inferred from measurements from the hot plasma instruments on the Polar spacecraft and the geosynchronous Los Alamos satellites, and simulated the time evolution of H$^{+}$, O$^{+}$, and He$^{+}$ ring current ion distributions. We found that the O$^{+}$ content of the ring current increased after each shock and reached maximum values of ∼ 60% near minimum Dst of the great storm. We calculated the growth rate of electromagnetic ion cyclotron waves considering for the first time wave excitation at frequencies below O$^{+}$ gyrofrequency. We found that the wave gain of O$^{+}$ band waves is greater and is located at larger L shells than that of the He$^{+}$ band waves during this storm interval. Isotropic pitch angle distributions indicating strong plasma wave scattering were observed by the imaging proton sensor (IPS) on Polar at the locations of maximum predicted wave gain, in good agreement with model simulations.
Starting Page	361
Ending Page	375
Page Count	15
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	204
Issue Number	1-2
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy, Astrophysics and Cosmology Astronomy Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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The storm-time ring current

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RING CURRENT DYNAMICS DURING THE 13–18 JULY 2000 STORM PERIOD

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RING CURRENT DYNAMICS DURING THE 13–18 JULY 2000 STORM PERIOD