1 / 11

March 5th, 2008 substorm event (0500-0700 UT) Waves observations

kameko-mack
Download Presentation

March 5th, 2008 substorm event (0500-0700 UT) Waves observations

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. O. Le Contel(1), A. Roux (1), P. Robert(1), E. Donovan(8), C. Jacquey(2), M. Berthomier(1), T. Chust(1), B. Grison(1), V. Génot(2), J.-A. Sauvaud(2), P. Louarn(2), G. Fruit(2), B. Lavraud(2), V. Angelopoulos(3), D. Sibeck(4),C. Chaston(5), C. Cully(6), R. Ergun(6), J. Bonnell(5), J. Mc Fadden(5), K.-H. Glassmeier(7), U. Auster(7), C. Carlson(5), D. Larson(5), S. Mende(5), H. Frey(5), • C. T. Russell(3), H. Singer(10), I. Mann(9) March 5th, 2008 substorm event (0500-0700 UT) Waves observations (1) CETP, CNRS/UVSQ/UPMC, France (2) CESR, CNRS, France (3) IGPP, UCLA, USA (4) GSFC, NASA, USA (5) SSL, UCB, USA, (6) LASP, CU, USA (7) TUBS, Germany (8) University of Calgary, Canada (9) University of Alberta, Canada (10) NOAA/SEC, Colorado, USA

  2. Locations in GSM 0500-07000 UT

  3. Overview in GSM Pseudo-breakup ~ 0603 UT Substorm ~ 0630 UT From E. Donovan presentation What about the wave activity In the magnetotail? Pseudo-breakup Substorm

  4. Thd, X~ - 10 RE, 0500-0700 UT Thd near-earth s/c •  Filter banks data • Magnetic and Electric activities • 3 Hz, 12 Hz increase • The electrostatic activity starts before the local dipolarisation and the start of the increase of the energetic ion pressure (cf. Jacquey) • Timing equivalent to pseudo-breakup timing (Donovan) • Thinning of the CS: Thd enters into the Lobe region just before dipolarisation • Large Vx >0 (earthward) and Vy<0

  5. Thc, X~ - 16 RE, 0500-0700 UT Thc in the mid tail Thc enters into the Lobe region around the pseudobreakup time and come back into the PS around 0637 UT: Thinning of the CS due to the near-earth current sheet disruption or vertical motion of the PS? • Filter banks data Pseudo-breakup: no wave activity Small electrostatic activity during the Lobe period close to the boundary • Main substorm: • Electromagnetic activity starts on Thc ~5-7 min later than on Thd • As the large Vx>0

  6. Thb, X~ - 20 RE, 0500-0700 UT Thb in the mid tail • Thb as Thc goes into the Lobe around • Pseudobreakup time and enters again into the PS around 0637 UT • Filter banks data • Electrostatic activity enhanced when Thb is close to the boundary (Open/closed Field lines) • Electromagnetic activity during the dipolarisation, same level as Thd or Thc: • Thb detects the dipolarisation and Large Vx>0 ~5-7 min later than Thd almost at the same time as Thc after a period in the lobe region

  7. Thd, 0600-0620 UT Pseudo-breakup Pseudo-breakup Thd data, around Pseudo-breakup ~ 0603 UT Electrostatic waves start ~ 060430 UT Electromagnetic waves ~ 060830 UT Thinning of the CS then thickenning with a large Vx>0 ( and Vy<0)~ 060830 UT

  8. Thd, 0620-0650 UT Main substorm Main substorm Thd data, around Pseudo-breakup ~ 0603 UT Electromagnetic and electrostatic waves detected when Thd exits the PS Large Vx>0 during the boundary crossing Thinning of the CS then thickenning with a Vx < 0 ( and Vy>0)~ 060830 UT

  9. Thd, particle burst : 0612-0642 UT Oscillations Of very thin Current sheet (Lobe entry) Dipolarisation Multiple Parallel current structures (FR?) Flow reversal Vx >0 then <0 But associated With the Boundary Xing Distribution Of ions? Vy,i < 0 Boundary effect? Whistler emissions

  10. Thd, particle burst : 0612-0642 UT Multiple Parallel current structures (FR?) Whistler emissions: Right-hand circularly Polarised Degree of polarisation ~ 1 Angle of propagation ~ 0 Ellipticity ~ + 1 Helicity ~1 Emissions during and after the local dipolarisation

  11. Summary/questions • For Thd (near-earth s/c): Pseudobreakup (~ 0603 UT) and Main substorm (~ 0630 UT) are associated with a strong electromagnetic wave activity and a dipolarisation • For Thc and Thb (mid-tail s/c): Pseudobreakup time correspond to a motion into the Lobe région associated with electrostatic activity close to the boundary. The CS is still thinning. Dipolarisation and large positive Vx occur 5-7 min later than on Thd • Whistler emissions are observed before, during and after the local dipolarisation on Thd. • Multiple parallel current signatures (FR?) are observed on Thd

More Related