VALIDATION OF THE SWARM LEVEL 1B DATA USING THE TIME-FREQUENCY ANALYSIS

TOOL.

C. Papadimitriou1,2,G. Balasis1, I. A. Daglis2,1

R. Haagmans3

1 Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece

2 Department of Physics, University of Athens, Athens, Greece

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Outline

ULF Waves (Pc3) TFA Tool Examples FTP Server & Products Methodology Validation Statistics

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

ULF Waves

Pulsation classes

Continuous pulsationsIrregular

pulsations

Pc 1 Pc 2 Pc 3 Pc 4 Pc 5 Pi 1 Pi 2

T [s] 0.2-5 5-1010-45

45-150

150-600

1-4040-150

f0.2-5

Hz

0.1-0.2 Hz

22-100 mHz

7-22 mHz

2-7 mHz

0.025-1 Hz

2-25 mHz

Compressional Pc 3 dayside upstream relate to wave-particle interaction in the foreshock and shock

Toroidal Pc 3 or multi-harmonics dayside upstream field line resonance harmonics in Pc 3 / Pc 4 range, compressional Pc3 as a driver (coupling with the fundamental toroidal mode)

http://magbase.rssi.ru/REFMAN/SPPHTEXT/ulf.html

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Examples of TFA output(wave event)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Examples of TFA output(plasma instabilities)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Examples of TFA output(instrument differences)

ftp Server @ IAASARS, NOA, GRip: 195.251.203.216

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

ftp Server @ IAASARS, NOA, GRip: 195.251.203.216

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

ftp Server @ IAASARS, NOA, GRip: 195.251.203.216

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

ftp Server @ IAASARS, NOA, GRip: 195.251.203.216

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Methodology Read Data (daily files) in a day-to-day basis

(+/- a few minutes to avoid edge effects)

Interpolate (small) gaps Filter (cutoff at 20 mHz) Wavelet Transform

(50 logarithmically spaced frequencies from 20 to 100 mHz)

Track Segmentation [-90, +90] degrees in Mag. Lat. Event Detection

Two - step thresholding Parameter Extraction Database Creation Post Processing

Balasis et al. 2013; Earth, Planets and Space

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

SH

UFFLED

SER

IES

MEAN + 3 ST.DEV

Ignoring largest 10%

points to minimize

spike influence

Balasis et al. ULFwave activity during the 2003 Halloween superstorm: multipoint

observations fromCHAMP, Cluster and Geotail missions,Ann. Geophys., 30, 1751-1768, doi:10.5194/angeo-30-1751-2012

tpeak = 14:42 fpeak = 79 mHz

Δt ~ 23’

Powerpeak = 28 nT2/Hz

Max(|B|) = 5.45 nTMax(|ΔΒ|) = 2.73 nT/sec

roughness(n) ~ 5 103 cm-3 rMAG = (-7o, 40o, 401 km)

MLT = 13:06, Lshell(ONERA IRBEM LIB)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

tpeak = 14:42 fpeak = 79 mHz

NOT AT THE EDGES

Δt ~ 23’Δt > 2 (1/fpeak)

Powerpeak = 28 nT2/HzEXCLUDE WEAK EVENTS

Max(|B|) = 5.45 nTMax(|ΔΒ|) = 2.73 nT/sec

REMOVE SPIKESMax(|ΔΒ|) vs Max(|B|)

roughness(n) ~ 5 103 cm-3 PLASMA INSTABILITIES

rMAG = (-7o, 40o, 401 km) MLT = 13:06

Balasis et al. ULFwave activity during the 2003 Halloween superstorm: multipoint

observations fromCHAMP, Cluster and Geotail missions,Ann. Geophys., 30, 1751-1768, doi:10.5194/angeo-30-1751-2012

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

tpeak = 14:42 fpeak = 79 mHz

NOT AT THE EDGES

Δt ~ 23’Δt > 2 (1/fpeak)

Powerpeak = 28 nT2/HzEXCLUDE WEAK EVENTS

Max(|B|) = 5.45 nTMax(|ΔΒ|) = 2.73 nT/sec

REMOVE SPIKESMax(|ΔΒ|) vs Max(|B|)

roughness(n) ~ 5 103 cm-3 PLASMA INSTABILITIES

rMAG = (-7o, 40o, 401 km) MLT = 13:06

Balasis et al. ULFwave activity during the 2003 Halloween superstorm: multipoint

observations fromCHAMP, Cluster and Geotail missions,Ann. Geophys., 30, 1751-1768, doi:10.5194/angeo-30-1751-2012

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

1 Hz magnetic field data (ASM scalar & magnitude of VFM vector)

2 Hz electron density data (from LP instrument)

Time span: 15th May 2014 – 15th Nov 2014

> 5,000 Tracks [-90, +90] degrees

~ 1,500 Wave Events per satellite Selected

Additional Data: OmniWeb Servicehttp://omniweb.gsfc.nasa.gov/

Dataset Description

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Overview (SWARM – B, ASM)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Overview (SWARM – B, VFM)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Overview (SWARM – A, ASM)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Overview (SWARM – A, VFM)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Overview (SWARM – C, ASM)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Overview (SWARM – C, VFM)

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Statistical Distributions of Wave ParametersSWARM-B, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Statistical Distributions of Wave ParametersSWARM-B, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Statistical Distributions of Wave ParametersSWARM-A, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Statistical Distributions of Wave ParametersSWARM-A, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Statistical Distributions of Wave ParametersSWARM-C, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Statistical Distributions of Wave ParametersSWARM-C, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Positional Distributions of Wave ParametersSWARM-B, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Positional Distributions of Wave ParametersSWARM-B, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Positional Distributions of Wave ParametersSWARM-A, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Positional Distributions of Wave ParametersSWARM-A, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Positional Distributions of Wave ParametersSWARM-C, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Positional Distributions of Wave ParametersSWARM-C, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Positional Distributions of Wave ParametersCHAMP

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Wave Power MapsSWARM-B, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Wave Power MapsSWARM-B, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Wave Power MapsSWARM-A, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Wave Power MapsSWARM-A, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Wave Power MapsSWARM-C, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Wave Power MapsSWARM-C, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Wave Power MapsCHAMP

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Seasonal VariationsSWARM-B, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Seasonal VariationsSWARM-B, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Seasonal VariationsSWARM-A, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Seasonal VariationsSWARM-A, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Seasonal VariationsSWARM-C, ASM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Seasonal VariationsSWARM-C, VFM

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Seasonal Variations

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam

Summary

Automated Detection Methodology Statistics of Wave Parameters

Variations of Wave Parameters vs Time Comparison between Instruments Comparison between Satellites

Statistical Validity test (more data) Propagation/Polarization parameters

Combination of Satellites

SWARM 4th Data Quality Workshop, 2-5 Dec 2014, GFZ Potsdam