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Simulation of Field-aligned H+ and He+ Dynamics During Late-stage Plasmasphere Refilling : Volume 26, Issue 6 (11/06/2008)

By Krall, J.

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Book Id: WPLBN0004001752
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Simulation of Field-aligned H+ and He+ Dynamics During Late-stage Plasmasphere Refilling : Volume 26, Issue 6 (11/06/2008)  
Author: Krall, J.
Volume: Vol. 26, Issue 6
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Huba, J. D., Fedder, J. A., & Krall, J. (2008). Simulation of Field-aligned H+ and He+ Dynamics During Late-stage Plasmasphere Refilling : Volume 26, Issue 6 (11/06/2008). Retrieved from

Description: Plasma Physics Div., Naval Research Lab., Code 6790, 4555 Overlook Ave., SW, Washington, D.C., 20375-5346, USA. The refilling of the plasmasphere for 3≤L≤4 following a model storm is simulated over long times (days) using the NRL ionosphere code SAMI2 (Sami2 is Another Model of the Ionosphere). Refilling is dependent on the supply of topside H+ and He+ ions with the result that H+ refilling rates decrease and He+ refilling rates generally increase with increasing F10.7 index. Both early- and late-stage refilling are affected by net ion flows from the warmer to the colder geomagnetic hemisphere. When these flows are strong, the ability of the winter helium bulge to increase He+ refilling rates is suppressed. When neutral winds are not included, refilling rates fall, typically by a factor of two. In most cases, late-stage He+ refilling is proportional to H+ refilling, with typical He+/H+ density ratios of 2% for solar minimum and 10% for solar maximum. For high values of F10.7, He+ refilling exhibits a strong diurnal variation so that the He+/H+ density ratio varies by as much as a factor of two during late-stage refilling. Finally if the plasmasphere is left undisturbed, the H+ density can refill for as long as five weeks at L=3 and ten weeks at L=4, with saturation densities nearly an order of magnitude greater than typical observed densities. This confirms that the plasmasphere at these L values rarely obtains saturation.

Simulation of field-aligned H+ and He+ dynamics during late-stage plasmasphere refilling

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