On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation

With its ∼ 12 h-long period of strongly northward magnetic field, the coronal mass ejection which passed Earth on April 11, 1997 affords an excellent opportunity of studying Kelvin-Helmholtz (KH) activity at the dayside magnetopause as a function of the clock angle, , of the interplanetary field (IM...

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Autores principales:	Farrugia, C.J., Gratton, F.T., Torbert, R.B., Bender, L., Gnavi, G., Ogilvie, K.W., Erkaev, N.V., Lepping, R.P., Stauning, P.
Formato:	JOUR
Materias:	Magnetic field effects Magnetometers Power density Space research corona geomagnetic field Kelvin-Helmholtz instability solar activity
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1105_Farrugia
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_02731177_v31_n4_p1105_Farrugia
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spelling	todo:paper_02731177_v31_n4_p1105_Farrugia2023-10-03T15:15:31Z On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation Farrugia, C.J. Gratton, F.T. Torbert, R.B. Bender, L. Gnavi, G. Ogilvie, K.W. Erkaev, N.V. Lepping, R.P. Stauning, P. Magnetic field effects Magnetometers Power density Space research corona geomagnetic field Kelvin-Helmholtz instability solar activity With its ∼ 12 h-long period of strongly northward magnetic field, the coronal mass ejection which passed Earth on April 11, 1997 affords an excellent opportunity of studying Kelvin-Helmholtz (KH) activity at the dayside magnetopause as a function of the clock angle, , of the interplanetary field (IMF). A correlation between the wavelength of the KH waves and θ may be expected on the basis of our recent model, where activity is generated in strips which broaden as θ decreases. We identify two 2-hour long intervals of small, but different, clock angles, and make a preliminary test of model predictions, using records from two ground magnetometer chains, both on the dayside. Taking into account the local time of the magnetometer arrays and the geometry of the KH-active strips, we show that the resonant stations measured considerably more spectral power density in the 3-4 mHz range during the phase with smaller θ. Moreover, as θ increases, the spectral power spectrum shifted to higher frequencies that were almost absent for smaller θ. © 2003 COSPAR. Published by Elsevier Science Ltd. All rights reserved. Fil:Gratton, F.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bender, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gnavi, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1105_Farrugia
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Magnetic field effects Magnetometers Power density Space research corona geomagnetic field Kelvin-Helmholtz instability solar activity
spellingShingle	Magnetic field effects Magnetometers Power density Space research corona geomagnetic field Kelvin-Helmholtz instability solar activity Farrugia, C.J. Gratton, F.T. Torbert, R.B. Bender, L. Gnavi, G. Ogilvie, K.W. Erkaev, N.V. Lepping, R.P. Stauning, P. On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation
topic_facet	Magnetic field effects Magnetometers Power density Space research corona geomagnetic field Kelvin-Helmholtz instability solar activity
description	With its ∼ 12 h-long period of strongly northward magnetic field, the coronal mass ejection which passed Earth on April 11, 1997 affords an excellent opportunity of studying Kelvin-Helmholtz (KH) activity at the dayside magnetopause as a function of the clock angle, , of the interplanetary field (IMF). A correlation between the wavelength of the KH waves and θ may be expected on the basis of our recent model, where activity is generated in strips which broaden as θ decreases. We identify two 2-hour long intervals of small, but different, clock angles, and make a preliminary test of model predictions, using records from two ground magnetometer chains, both on the dayside. Taking into account the local time of the magnetometer arrays and the geometry of the KH-active strips, we show that the resonant stations measured considerably more spectral power density in the 3-4 mHz range during the phase with smaller θ. Moreover, as θ increases, the spectral power spectrum shifted to higher frequencies that were almost absent for smaller θ. © 2003 COSPAR. Published by Elsevier Science Ltd. All rights reserved.
format	JOUR
author	Farrugia, C.J. Gratton, F.T. Torbert, R.B. Bender, L. Gnavi, G. Ogilvie, K.W. Erkaev, N.V. Lepping, R.P. Stauning, P.
author_facet	Farrugia, C.J. Gratton, F.T. Torbert, R.B. Bender, L. Gnavi, G. Ogilvie, K.W. Erkaev, N.V. Lepping, R.P. Stauning, P.
author_sort	Farrugia, C.J.
title	On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation
title_short	On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation
title_full	On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation
title_fullStr	On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation
title_full_unstemmed	On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation
title_sort	on the dependence of dayside kelvin-helmholtz activity on imf orientation
url	http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1105_Farrugia
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On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation

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