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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2003
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v31_n4_p1105_Farrugia http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1105_Farrugia |
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paper:paper_02731177_v31_n4_p1105_Farrugia2023-06-08T15:25:31Z On the dependence of dayside Kelvin-Helmholtz activity on IMF orientation Gratton, Fausto Tulio Livio Bender, Laurence E. Gnavi, Graciela Delia 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. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v31_n4_p1105_Farrugia 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 Gratton, Fausto Tulio Livio Bender, Laurence E. Gnavi, Graciela Delia 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. |
| author |
Gratton, Fausto Tulio Livio Bender, Laurence E. Gnavi, Graciela Delia |
| author_facet |
Gratton, Fausto Tulio Livio Bender, Laurence E. Gnavi, Graciela Delia |
| author_sort |
Gratton, Fausto Tulio Livio |
| 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 |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02731177_v31_n4_p1105_Farrugia http://hdl.handle.net/20.500.12110/paper_02731177_v31_n4_p1105_Farrugia |
| work_keys_str_mv |
AT grattonfaustotuliolivio onthedependenceofdaysidekelvinhelmholtzactivityonimforientation AT benderlaurencee onthedependenceofdaysidekelvinhelmholtzactivityonimforientation AT gnavigracieladelia onthedependenceofdaysidekelvinhelmholtzactivityonimforientation |
| _version_ |
1768544317112057856 |