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

3. From E. Donovan presentation What about the wave activity
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 near-earth s/c Thd, X~ - 10 RE, 0500-0700 UT  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 in the mid tail Thc, X~ - 16 RE, 0500-0700 UT
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 in the mid tail Thb, X~ - 20 RE, 0500-0700 UT
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. Pseudo-breakup Thd, 0600-0620 UT Thd data, around
Pseudo-breakup ~ 0603 UT
Electrostatic waves start ~ UT
Electromagnetic waves ~ UT
Thinning of the CS
then thickenning with a large Vx>0
( and Vy<0)~ UT

8. Main substorm Thd, 0620-0650 UT 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)~ 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. Multiple Parallel current structures (FR?)
Thd, particle burst : 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. For Thd (near-earth s/c):
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