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Features of Highly Structured Equatorial Plasma Irregularities Deduced from Champ Observations : Volume 30, Issue 8 (24/08/2012)

By Xiong, C.

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Book Id: WPLBN0004002064
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Features of Highly Structured Equatorial Plasma Irregularities Deduced from Champ Observations : Volume 30, Issue 8 (24/08/2012)  
Author: Xiong, C.
Volume: Vol. 30, Issue 8
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473, Potsdam, Germany. In this study five years of CHAMP (Challenging Mini-satellite Payload) fluxgate magnetometer (FGM) data is used to investigate the characteristics of Equatorial Plasma Bubbles (EPBs). We filtered the FGM data by using band-passes with four different cut-off periods to get the EPBs with different maximum spatial scale sizes in the meridional plane ranging from 76–608 km. Associated with the EPB observations at about 400 km, the typical altitude of CHAMP during the year 2000–2005, we also investigate the post-sunset equatorial vertical plasma drift data from ROCSAT-1 (Republic of China Satellite 1). Since the height of the F-layer is highly correlated with the vertical plasma drift and solar flux, we sorted the ROCSAT-1 data into different groups by F10.7. From the integrated vertical drift we have estimated the post-sunset uplift of the ionosphere. By comparing the properties of EPB occurrence for different scale sizes with the global distribution of plasma vertical uplift, we have found that EPBs reaching higher altitudes are more structured than those which are sampled by CHAMP near the top side of the depleted fluxtube. Such a result is in accord with 3-D model simulations (Aveiro and Hysell, 2010). Small-scale EPB structures are observed by CHAMP when the irregularities reach apex heights of 800 km and more. Such events are encountered primarily in the Brazilian sector during the months around November, when the post-sunset vertical plasma drift is high.

Summary
Features of highly structured equatorial plasma irregularities deduced from CHAMP observations

Excerpt
Aveiro, H. C. and Hysell, D. L.: Three dimensional numerical simulation of equatorial F region plasma irregularities with bottomside shear flow, J. Geophys. Res., 115, A11321, doi:10.1029/2010JA015602, 2010.; Farley, D., Balsey, B., Woodman, R., and McClure, J.: Equatorial Spread F: Implications of VHF Radar Observations, J. Geophys. Res., 75, 7199–7216, 1970.; Burke, W. J., Gentile, L. C., Huang, C. Y., Valladares, C. E., and Su, S. Y.: Longitudinal variability of equatorial plasma bubbles observed by DMSP and ROCSAT-1, J. Geophys. Res., 109, A12301, doi:10.1029/2004JA010583, 2004.; Fejer, B. G., Scherliess, L., and de Paula, E. R.: Effects of the vertical plasma drift velocity on the generation and evolution of equatorial spread F, J. Geophys. Res., 104, 19859–19869,, 1999.; Fejer, B. G., Jensen, J. W., and Su, S.-Y.: Quiet time equatorial F region vertical plasma drift model derived from ROCSAT-1 observations, J. Geophys. Res., 113, A05304, doi:10.1029/2007JA012801, 2008.; Huang, C. Y., Burke, W. J., Machuzak, J. S., Gentile, L. C., and Sultan, P.: DMSP observations of equatorial plasma bubbles in the topside ionosphere near solar maximum, J. Geophys. Res., 106, 8131–8142, 2001.; Hysell, D. L.: A review and synthesis of plasma irregularities in equatorial spread F, J. Atmos. Sol.-Terr. Phys., 62, 1037–1056, 2000.; Hysell, D. L. and Seyler, C. E.: A renormalization group approach to estimation of anomalous diffusion in the unstable equatorial F region, J. Geophys. Res., 103, 26731–26737, doi:10.1029/98JA02616, 1998.; Jayachandran, B., Balan, N., Rao, P. B., Sastri, J. H., and Bailey, G. J.: HF Doppler and ionosonde observations on the onset conditions of equatorial spread-F, J. Geophys. Res., 98, 13741–13750, 1993.; Kelley, M. C.: The Earth's Ionosphere, Plasma Physics and Electrodynamics, 2nd Edn., Academic, San Diego Calif, 2009.; Lühr, H., Rother, M., Maus, S., Mai, W., and Cooke, D.: The diamagnetic effect of the equatorial Appleton anomaly: Its characteristics and impact on geomagnetic field modeling, Geophys. Res. Lett., 30, 1906, doi:10.1029/2003GL017407, 2003.; Makela, J. J. and Kelley, M. C.: Using the 630.0-nm nightglow emission as a surrogate for the ionospheric Pedersen conductivity, J. Geophys. Res., 108, 1253, doi:10.1029/2003JA009894, 2003.; Makela, J. J., Kelley, M. C., and Su, S.-Y.: Simultaneous observations of convective ionospheric storms: ROCSAT-1 and ground-based imagers, Space Weather, 3, S12C02, doi:10.1029/2005SW000164, 2005.; Ossakow, S. L.: Spread F theories – A review, J. Atmos. Sol.-Terr. Phys., 43, 437–452, 1981.; Reigber, C., Lühr, H., and Schwintzer, P.: CHAMP mission status, Adv. Space Res., 30, 129–134, 2002.; Singh, S., Johnson, F. S., and Power, R. A.: Gravity wave seeding of equatorial plasma bubbles, J. Geophys. Res., 102, 7399–7410, doi:10.1029/96JA03998, 1997.; Sobral, J. H. A., Abdu, M. A., Takahashi, H., Sawant, H., Zamlutti, C. J., and Borba, G. L.: Solar and geomagnetic activity effects on nocturnal zonal velocities of ionospheric plasma depletions, Adv. Space Res., 24, 1507–1510, 1999.; Stolle, C., Lühr, H., Rother, M., and Balasis, G.: Magnetic signatures of equatorial spread F, as observed by the CHAMP satellite, J. Geophys. Res., 111, A02304, doi:10.1029/2005JA011184, 2006.; Stolle, C., Lühr, H., and Fejer, B. G.: Relation between the occurrence rate of ESF and the equatorial vertical plasma drift velocity at sunset derived fr

 

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