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Reconstruction of Geomagnetic Activity and Near-earth Interplanetary Conditions Over the Past 167 Yr – Part 1: a New Geomagnetic Data Composite : Volume 31, Issue 11 (18/11/2013)

By Lockwood, M.

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Book Id: WPLBN0004002283
Format Type: PDF Article :
File Size: Pages 21
Reproduction Date: 2015

Title: Reconstruction of Geomagnetic Activity and Near-earth Interplanetary Conditions Over the Past 167 Yr – Part 1: a New Geomagnetic Data Composite : Volume 31, Issue 11 (18/11/2013)  
Author: Lockwood, M.
Volume: Vol. 31, Issue 11
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Nevanlinna, H., Owens, M. J., Rouillard, A. P., Lockwood, M., Barnard, L., Davis, C. J., & Harrison, R. G. (2013). Reconstruction of Geomagnetic Activity and Near-earth Interplanetary Conditions Over the Past 167 Yr – Part 1: a New Geomagnetic Data Composite : Volume 31, Issue 11 (18/11/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Meteorology Department, University of Reading, Reading, Berkshire, UK. We present a new composite of geomagnetic activity which is designed to be as homogeneous in its construction as possible. This is done by only combining data that, by virtue of the locations of the source observatories used, have similar responses to solar wind and IMF (interplanetary magnetic field) variations. This will enable us (in Part 2, Lockwood et al., 2013a) to use the new index to reconstruct the interplanetary magnetic field, B, back to 1846 with a full analysis of errors. Allowance is made for the effects of secular change in the geomagnetic field. The composite uses interdiurnal variation data from Helsinki for 1845–1890 (inclusive) and 1893–1896 and from Eskdalemuir from 1911 to the present. The gaps are filled using data from the Potsdam (1891–1892 and 1897–1907) and the nearby Seddin observatories (1908–1910) and intercalibration achieved using the Potsdam–Seddin sequence. The new index is termed IDV(1d) because it employs many of the principles of the IDV index derived by Svalgaard and Cliver (2010), inspired by the u index of Bartels (1932); however, we revert to using one-day (1d) means, as employed by Bartels, because the use of near-midnight values in IDV introduces contamination by the substorm current wedge auroral electrojet, giving noise and a dependence on solar wind speed that varies with latitude. The composite is compared with independent, early data from European-sector stations, Greenwich, St Petersburg, Parc St Maur, and Ekaterinburg, as well as the composite u index, compiled from 2–6 stations by Bartels, and the IDV index of Svalgaard and Cliver. Agreement is found to be extremely good in all cases, except two. Firstly, the Greenwich data are shown to have gradually degraded in quality until new instrumentation was installed in 1915. Secondly, we infer that the Bartels u index is increasingly unreliable before about 1886 and overestimates the solar cycle amplitude between 1872 and 1883 and this is amplified in the proxy data used before 1872. This is therefore also true of the IDV index which makes direct use of the u index values.

Summary
Reconstruction of geomagnetic activity and near-Earth interplanetary conditions over the past 167 yr – Part 1: A new geomagnetic data composite

Excerpt
Barraclough, D. R.: Spherical Harmonic Analyses of the Geomagnetic Field for Eight Epochs between 1600 and 1910, Geophysical J. of the R.A.S., 36, 497–513, doi:10.1111/j.1365-246X.1974.tb00611.x, 1974.; Barraclough, D. R.: Spherical harmonic models of the geomagnetic field, Inst. Geol. Sci., Geomagn. Bull., 8., Stationery Office Books (London), ISBN-10: 0118812696, ISBN-13: 9780118812696, 1978.; Bartels, J.: Terrestrial-magnetic activity and its relations to solar phenomena, Terr. Magn. Atmos. Electr., 37, 1–52, doi:10.1029/TE037i001p00001, 1932.; Bartels, J., Heck, N. H., and Johnston, H. F.: The three-hour-range index measuring geomagnetic activity, J. Geophys. Res., 44, 411–454, doi:10.1029/TE044i004p00411, 1939.; Brum, C. G. M., Tepley, C. A., Fentzke, J. T., Robles, E., dos Santos, P. T., and Gonzalez, S. A.: Long-term changes in the thermospheric neutral winds over Arecibo: Climatology based on over three decades of Fabry-Perot observations , J. Geophys. Res., 117, A00H14, doi:10.1029/2011JA016458, 2012.; Clilverd, M. A., Clark, T. D. G., Clarke, E., and Rishbeth, H.: Increased magnetic storm activity from 1868 to 1995, J. Atmos. Sol.-Terr. Phy., 60, 1047–1056, doi:10.1016/S1364-6826(98)00049-2, 1998.; Clilverd, M. A., Clarke, E., Ulich, T., Linthe, J.-H., and Rishbeth, H.: Reconstructing the long-term $aa$ index, J. Geophys. Res., 110, A07205, doi:10.1029/2004JA010762, 2005.; Cnossen, I. and Richmond, A. D.: Changes in the Earth's magnetic field over the past century: Effects on the ionosphere-thermosphere system and solar quiet (Sq) magnetic variation, J. Geophys. Res., 118, 849–858, doi:10.1029/2012JA018447, 2013.; Feynman, J. and Crooker, N. U.: The solar wind at the turn of the century, Nature, 275, 626–627, doi:10.1038/275626a0, 1978.; Finch, I. and Lockwood, M.: Solar wind-magnetosphere coupling functions on timescales of 1 day to 1 year, Ann. Geophys., 25, 495–506, doi:10.5194/angeo-25-495-2007, 2007.; Finch, I. D., Lockwood, M., and Rouillard, A. P.: Effects of solar wind magnetosphere coupling recorded at different geomagnetic latitudes: Separation of directly-driven and storage/release systems, Geophys. Res. Lett., 35, L21105, doi:10.1029/2008GL035399, 2008.; Finlay, C. C., Maus, S., Beggan, C. D., Bondar, T. N., Chambodut, A., Chernova, T. A., Chulliat, A., Golovkov, V. P., Hamilton, B., Hamoudi, M., Holme, R., Hulot, G., Kuang, W., Langlais, B., Lesur, V., Lowes, F. J., Lühr, H., Macmillan, S., Mandea, M., McLean, S., Manoj, C., Menvielle, M., Michaelis, I., Olsen, N., Rauberg, J., Rother, M., Sabaka, T. J., Tangborn, A., Tøffner-Clausen, L., Thébault, E., Thomson, A. W. P., Wardinski, I., Wei, Z., and Zvereva, T. I.: International Geomagnetic Reference Field: the eleventh generation, Geophys. J. Int., 183, 1216–1230, doi:10.1111/j.1365-246X.2010.04804.x, 2010.; Gustafsson, G., Papitashvili, N. E., and Papitashvili, V. O.: A Revised Corrected Geomagnetic Coordinate System for Epochs 1985 and 1990, J. Atmos. Terr. Phys., 54, 1609–1631, 1992.; Harrison, R. G.: Long term measurements of the global atmospheric electric circuit at Eskdalemuir, Scotland, 1911–1981, Atmos. Res., 70, 1–19, doi:10.1016/j.atmosres.2003.09.007

 

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