World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Outflowing Protons and Heavy Ions as a Source for the Sub-kev Ring Current : Volume 27, Issue 2 (19/02/2009)

By Giang, T. T.

Click here to view

Book Id: WPLBN0003973911
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Outflowing Protons and Heavy Ions as a Source for the Sub-kev Ring Current : Volume 27, Issue 2 (19/02/2009)  
Author: Giang, T. T.
Volume: Vol. 27, Issue 2
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Hamrin, M., Lundin, R., Ebihara, Y., Klecker, B., Mccarthy, M., Yamauchi, M.,...Dandouras, I. (2009). Outflowing Protons and Heavy Ions as a Source for the Sub-kev Ring Current : Volume 27, Issue 2 (19/02/2009). Retrieved from http://members.worldlibrary.net/


Description
Description: Swedish Institute of Space Physics, Kiruna, Sweden. Data from the Cluster CIS instrument have been used for studying proton and heavy ion (O+ and He+) characteristics of the sub-keV ring current. Thirteen events with dispersed heavy ions (O+ and He+) were identified out of two years (2001 and 2002) of Cluster data. All events took place during rather geomagnetically quiet periods. Three of those events have been investigated in detail: 21 August 2001, 26 November 2001 and 20 February 2002. These events were chosen from varying magnetic local times (MLT), and they showed different characteristics.

In this article, we discuss the potential source for sub-keV ring current ions. We show that: (1) outflows of terrestrial sub-keV ions are supplied to the ring current also during quiet geomagnetic conditions; (2) the composition of the outflow implies an origin that covers an altitude interval from the low-altitude ionosphere to the plasmasphere, and (3) terrestrial ions are moving upward along magnetic field lines, at times forming narrow collimated beams, but frequently also as broad beams. Over time, the ion beams are expected to gradually become isotropised as a result of wave-particle interaction, eventually taking the form of isotropic drifting sub-keV ion signatures. We argue that the sub-keV energy-time dispersed signatures originate from field-aligned terrestrial ion energising and outflow, which may occur at all local times and persist also during quiet times.


Summary
Outflowing protons and heavy ions as a source for the sub-keV ring current

Excerpt
Balsiger, H., Eberhardt, P., Geiss, J., and Young, D. T.: Magnetic storm injection of 0.9- to 16-keV/e solar and terrestrial ions into the high-altitude magnetosphere, J. Geophys. Res., 85(A4), 1645–1662, 1980.; Chappell, C. R., Green, J. L., Johnson, J. F. E., and Waite Jr., J. H.: Pitch angle variations in magnetospheric thermal plasma – Initial observations from Dynamics Explorer-1, Geophys. Res. Lett., 9(9), 933–936, 1982.; Collin, H. L., Quinn, J. M., and Cladis, J. B.: An empirical static model of low energy ring current ions, Geophys. Res. Lett., 20(2), 141–144, 1993.; Ebihara, Y., Yamauchi, M., Nilsson, H., Lundin, R., and Ejiri, M.: Wedge-like dispersion of sub-keV ions in the dayside magnetosphere: Particle simulation and Viking observation, J. Geophys. Res., 106(A12), 29571–29584, 2001.; Ebihara, Y., Kistler, L. M., and Eliasson, L.: Imaging cold ions in the plasma sheet from the Equator-S satellite, Geophys. Res. Lett., 35, L15103, doi:10.1029/2008GL034357, 2008.; Fennell, J. F., Croley Jr., D. R., and Kaye, S. M.: Low-energy ion pitch angle distributions in the outer magnetosphere: Ion zipper distributions, J. Geophys. Res., 86(A5), 3375–3382, 1981.; Geiss, J., Balsiger, H., Eberhardt, P., Walker, H. P., Weber, L., and Young, D. T.: Dynamics of magnetospheric ion composition as observed by the GEOS mass spectrometer, Space Sci. Rev., 22, 537–566, 1978.; Horwitz, J. L.: Core plasma in the magnetosphere, Rev. Geophys., 25(3), 579–587, 1987.; Kaye, S. M., Shelley, E. G., Sharp, R. D., and Johnson, R. G.: Ion composition of zipper events, J. Geophys. Res., 86(A5), 3383–3388, 1981.; Lundin, R., Lyons, L. R., and Pissarenko, N.: Observations of the ring current composition at $L<$4, Geophys. Res. Lett., 7(6), 425–428, 1980.; Maynard, N. C. and Chen, A. J.: Isolated cold plasma regions: Observations and their relation to possible production mechanisms, J. Geophys. Res., 80, 1009–1013, 1975.; Moore, T. E.: Modulation of terrestrial ion escape flux composition (by low-altitude acceleration and charge exchange chemistry), J. Geophys. Res., 85(A5), 2011–2116, 1980.; Moore, T. E., Lundin, R., Alcayde, D., Andre, M., Ganguli, S. B., Temerin, M., and Yau, A.: Source processes in the high-latitute ionosphere, Ch #2, in: Magnetospheric Plasma Sources and Losses, Space Sci. Rev., 88, 7–84, 1999.; Newell, P. T. and Meng, C.-I.: Substorm introduction of $\le $1-keV magnetospheric ions into the inner plasmasphere, J. Geophys. Res., 91(A10), 11133–11145, 1986.; Rème, H., Aoustin, C., Bosqued, J. M., et al.: First multispacecraft ion measurements in and near the Earth's magnetosphere with the identical Cluster ion spectrometry (CIS) experiment, Ann. Geophys., 19, 1303–1354, 2001.; Roelof, E. C., Mitchell, D. G., and Williams, D. J.: Energetic neutral atoms (E$\sim $50 keV) from the ring current: IMP 7/8 and SSE 1, J. Geophys. Res., 90(A11), 10991–11008, 1985.; Sauvaud, J. A., Crasnier, J., Mouala, K., Kovrazhkin, R. A., and Jorjio, N. V.: Morning sector ion precipitation following substorm injections, J. Geophys. Res., 86(A5), 3430–3438, 1981.; Shelley, E. G., Johnson, R. G., and Sharp, R. D.: Satellite observations of enegetic heavy ions during a geomagnetic storm, J. Geophys. Res., 77(31), 6104–6110, 1972.; Stern, D. P.: The motion of a proton in the equatorial magnetosphere, J. Geophys. Res., 80, 595–599, 1975.; Tinsley, B. A.: Neutral atom precipitation – a review, J. Atmos. Terr. Phys., 43(5/6), 617–632, 1981.; Vallat, C., Ganushkina, N., Dandouras, I., Escoubet, C. P., Taylor, M. G. G. T., Laakso, H., Masson, A., Sauvaud, J.-A., Rème, H., and Daly, P.: Ion multi-nose structures observed by Cluster in the inner Magnetosphere, Ann. Geophys., 25, 171–190, 2007.; Volland, H.: A semiempirical model of large-scale magnetospheric electric fields, J. Geophys. Res., 78, 171–180, 1973.; Williams, D. J.: The Earth's ring current: causes, generation, and decay, Space Sci. Rev., 34, 223–234, 1983.; Yamauchi, M., Lundin, R., Eliasson, L.


 

Click To View

Additional Books


  • Remote Oxygen Sensing by Ionospheric Exc... (by )
  • Estimates of Magnetic Cloud Expansion at... (by )
  • The Exchange Across the Tropical Tropopa... (by )
  • Central Polar Cap Convection Response to... (by )
  • Intraseasonal Oscillation (Iso) in the M... (by )
  • Simultaneous Observation of Ionospheric ... (by )
  • Estimates of Vertical Eddy Diffusivity i... (by )
  • Magnetic Flux Transfer in the 5 April 20... (by )
  • Scale Sizes of Intense Auroral Electric ... (by )
  • Simulated Solar Wind Plasma Interaction ... (by )
  • What Causes the Variations of the Peak I... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.