Calibration

Cluster PEACE Cross-Calibration
Available WHISPER events

[For 2001-2003 Plasmasheet events click here, and 2002 Sheath events click here.]

Below is a table listing the events that are being used for cross-calibration studies of the PEACE data with WHISPER. The additional datasets are used in the calibration routines to imporve the PEACE moments. Ultimately events covering all energy ranges will be identified to provide and overall picture of the Energy Response Curve for the PEACE instrument, and will be used to calibrate all data to a high degree of accuracy.

The events below are constrained by:

The availablility of good quality WHISPER data
Close spacecraft separation, ideally ~a few hundred km
Good Gain level on the PEACE instrument to ensure that all anodes are operating at a similar level of accuracy

In subsequent studies this constraint will be relaxed to allow variation of the 'alpha' factor

Burst Mode intervals to ensure high resolution PEACE data
Events from all regions i.e. magnetosheath, solar wind, plasma sheet etc

The red entries indicate that more recent data has been received from the WHI team, and these are used in the calibration study.

Oribit:Date DOY	Available data interval PEACE and WHI	Sensor data	Mode	MCP Gain	SC sep	Region
283: 28-29/04/02 118-119	28/04 - 3DX data from 0600-0850UT HEEA/LEEA overlapping energy range: 6.9keV-9.5eV Peak energy ~100eV WHI from CNRS Reprocessed high quality WHI data 0600-0850UT	C1234 LEEA C24 HEEA	BM	GOOD	100km	MS
288: 09-10/05/02 129-130	09/05 - 3DX data from 1920-2045UT HEEA/LEEA overlapping energy range: 26.4keV-14.2eV Peak energy ~ 20eV NO WHISPER data - waiting for reprocessed data 10/05 - 3DR data 0000-0850UT WHI from CNRS - 0430-0855UT	C24 LEEA C1234 HEEA C1234 LEEA C1234 HEEA 0000-0325UT	BM NM	GOOD GOOD	100km	PS MS
305: 20-21/06/02 171-172	20/06 - 3DX data from 0600-0830UT HEEA/LEEA overlapping energy range: 6.9keV-9.5eV Peak energy ~50eV WHI from CNRS - NO EFW corr	C1234 LEEA C24 HEEA	BM	GOOD	100km	MS
410: 24-25/02/03 55-56	24/02 - 3DX data from 0800-1145UT. Sheath after 1020UT HEEA range: 26.4keV-34eV; LEEA range: 4.5keV-7.1eV Overlap: 4.5keV-34eV Peak energy ~100eV WHI from CNRS 1000-1145UT Reprocessed high quality WHI data 0700-0930UT (C4 0700-0750UT)	C1234 LEEA C24 HEEA	BM	GOOD	200km	MS

Other events are available where the constraints are not so restrictive. Below is a table of other events that are being studied.

Orbit/Date/DOY	Available data	Mode	MCP Gain	SC Sep	Region
167: 25-26/07/01 206-207	3DR HEEA data 26/07/01 Energy ~ Limited WHI data 4min res 2200-0552UT 25-26/7/01	NM	GOOD	600km	PS
434:
558:
119: 02-03/04/01	02/04 - 3DR derived 3DFXRL/H 1940-0200UT WHI high quality CNRS - ONLY C4 1900-0415UT	BM	BAD	600km	MS
142: 27-28/05/01	27/05 - 3DX data 11-21UT Energy ~100eV - SIMILAR TO 283 WHI high quality CNRS 18-22UT WHI high quality EFW corr 18-22UT	NM	BAD	600km	MS

Key for abbreviations:

Regions:

These are the regions observed by PEACE during the orbit:

SW = solar wind
MS = magnetosheath
MP = magnetopause

AZ = cusp or auroral zone
PS = plasmasheet

Mode:

This will give you a clue as to what data products to expect (more 3D data in BM):

NM = Normal mode

Generally 3DR data which is not returned every spin from every spacecraft.
Can generate a '3DX-like' product called '3DFXR' which is being tested.

BM = Burst mode
Generally 3DX family of products, e.g. 3DX1P, 3DX2P etc

PEACE MCP Gain:

GOOD = "good" gain (>=1e6 electrons)
BAD = "bad" gain (<1e6 electrons)
OK = around 1e6 electrons

SC Sep:

The inter-spacecraft separation. Initially we are investigating close separation events as these allow

N.B. Gain curves vary for each sensor – this column gives an overview – check the curves!

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