From: "Saved by Windows Internet Explorer 9" Subject: Einstein-De Haas Coupling of Geomagnetic Storms to the Earth's Crust Date: Sat, 19 Feb 2011 20:16:35 -0500 MIME-Version: 1.0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Location: http://adsabs.harvard.edu/abs/2010AGUFMNH13A1141W X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18263 =EF=BB=BF Einstein-De Haas Coupling of Geomagnetic Storms to the Earth's=20 Crust
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Title:
Einstein-De Haas Coupling of = Geomagnetic=20 Storms to the Earth's Crust
Authors:
Walkley, R. L.;=20 Laz= arus, M.;=20 Wang= , J. S.;=20 D= ahlgren, R.;=20 = Freund, F. T.
Affiliation:
AA(Physics, Lancaster University, = Lancaster,=20 United Kingdom; ), AB(Physics, Lancaster University, Lancaster, United = Kingdom;=20 ), AC(SETI Institute, Mountain View, CA, USA; ), AD(SETI Institute, Mountain View, CA, USA; ), AE(SETI Institute, Mountain View, CA, USA; )
Publication:
American Geophysical Union, Fall = Meeting=20 2010, abstract #NH13A-1141
Publication = Date:
12/2010
Origin:
AGU
Keywords:
[5440] PLANETARY SCIENCES: SOLID = SURFACE=20 PLANETS / Magnetic fields and magnetism, [7513] SOLAR PHYSICS,=20 ASTROPHYSICS, AND ASTRONOMY / Coronal mass ejections, [7904] SPACE = WEATHER=20 / Geomagnetically induced currents, [8164] TECTONOPHYSICS / = Stresses:=20 crust and lithosphere
Bibliographic = Code:
2010AGUFMNH13A= 1141W

Abstract

During=20 geomagnetic storms coronal mass ejection (CME) often arrive atthe Earth = within a=20 few minutes. The CME carry with them, among otherthings, rapid magnetic = field=20 changes =CE=B4B/=CE=B4t. In the crust,=CE=B4B/=CE=B4t couples to the = magnetic moments of=20 paramagnetic ions,flipping their electron spins and giving rise to an = Einstein=20 de-Haasforce [1]. In this study the magnitude of the Einstein de-Haas = force is calculated, assuming a spin density in crustal rocks on the order of1035 = km-3=20 and a rigid 300 km x 300 km crustal block that is 10 km thick.Under = these=20 conditions a 400 nT (G4-class) solar event is estimated toinduce an = Einstein-De=20 Haas torque of 1.2 x 1011 N-m. Such large torquesmay trigger earthquakes = along=20 faults where tectonic stresses are closeto the failure threshold. We = therefore=20 anticipate that due toEinstein-de Haas coupling, there may be an = increase in=20 seismic activitywithin a relatively short time window after arrival of = large=20 magneticstorms. The transient augmentation in crustal stress may also = manifest itself in an increase in air ionization at the Earth=E2=80=99s surface = andother=20 phenomena [2]. Time-series analysis has shown that localseismicity and=20 integrated earthquake energy appear to have periodicitieswith respect to = local=20 time, possibly due to ionosphere-to-solid Earthcoupling [3]. A similar = approach=20 will be used to perform a correlationanalysis of seismic events with = respect to=20 historical CME events. [1] A.Einstein and W. de Haas, = =E2=80=9CExperimental proof of the=20 existence ofAmp=C3=A8re's molecular currents,=E2=80=9D Proc. Koninklijke = Akad.Wetenschappen=20 te Amsterdam, 18, 696-711 (1915). [2] F. Freund et al.,=E2=80=9CAir = ionization at rock=20 surface and pre-earthquake signals,=E2=80=9DJ. Atmos. Sol. Terr. Phys., = 71, 1824-1834=20 (2009). [3] G. Duma and Y.Ruzhin, =E2=80=9CDiurnal changes of earthquake = activity and=20 geomagneticSq-variations,=E2=80=9D Natural Hazards and Earth System = Sciences, 3,171-177=20 (2003).
=
Bibtex=20 entry for this abstract   Preferred=20 format for this abstract (see Preferences)
   

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