1 / 9

Period July 2001 to June 2003.

brock-allison
Download Presentation

Period July 2001 to June 2003.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Etudes statistiques de la puissance des ondes à la magnétopause et à son voisinage (Traversées Cluster). Corrélations avec la pression du vent solaire.David Attié, Nicole Cornilleau-wehrlin, Gérard Belmont, Laurence RezeauC.E.T.P (Vélizy)Traversées 2001-2003 (Attié et al 2006,JGR, en révision)Traversées 2004-2005 (Groupe thématique)

  2. Crossings distribution in YZ plane(GSE frame). • Period July 2001 to June 2003. • Magnetopause crossings by CLUSTER either on the day side at high latitudes, or at low latitude on the flanks.

  3. Cluster 1 whisper (natural) Freq(Hz) Staff-sc (B2z,sr2) Freq(Hz) fgm Bx (nT) By Bz (gse) CLUSTER 1, 2001/02/14, MP crossing • Statistics on MP and adjacent MSH wave power. • Wave power and amplification at the MP. • External source for MP wave activity? • Role of B rotation?

  4. Role of B rotation in wave power and amplification • Wave power Strong correlation between wave power and B rotation at the MP. P*max nT2  (deg) • Amplification into the boundary (deg) Weak amplification (low rotation) Strong amplification (high rotation)  (deg)

  5. B rotation and wave power calculation. Peak power Pmax(nT2) B power (0.35-10 Hz, STAFF), 1s resolution. BL,LMN frame (FGM) B rotation (LM plane) Average power Pmsh(nT2) nT2 nT  (deg) Time(HH:MN:SS)

  6. Solar wind influence (years 2001-2003) Normalized power (0.35-10Hz) The wave power in MSH is correlated with the solar wind dynamic pressure (thanks to ACE data). Such a behaviour might take part of driven reconnection scenarios. P*msh Solar wind dynamic pressure(nPa)

  7. Solar wind influence (years 2004-2005) Normalized power (0.35-10Hz) 7-11 nov 2004 1 janv 2005 P*msh Solar wind dynamic pressure(nPa)

  8. Solar wind influence (years 2004-2005) Normalized power (0.35-10Hz) 7-11 nov 2004 1 janv 2005 P*msh Subsolar point (distance in Re, Sibeck model)

  9. Evidence of an external source The wave power is normalized to the local magnetic field. An amplification and a strong correlation appears between the turbulence level of MP and MSH . Turbulence in MSH can be see as an external source to the high wave activity at the MP. P*max y=21x1.12, r=0.96 P*msh

More Related