SPASE version 2.0.0

Numerical Data Product: Geotail Editor-A 12 second Low-Energy Particles

Resource ID
spase://Example/NumericalData/Geotail/LEP/EDA.PT12S
Name
Geotail Editor-A 12 second Low-Energy Particles
Description

An example subset of the 12-second Editor-A low-energy particle data from the Geotail spacecraft.

Editor-A data are only acquired with the real-time operation in Usuda Deep Space Center (UDSC),Japan, while the Editor-B data are 24-hours continuouslyrecorded in the onboard tape recorders and are dumpedover the NASA/JPL Deep Space Network (DSN) stations.

The ion energy analyzer (LEP-EAi) has two energy scan mode: RAM-A (60 eV to 40 keV) and RAM-B (5 keV to 40 keV). RAM-B is selected to protect the very sensitive detector from intense low energy fluxes that are usually seen in the solar wind and magnetosheath. The energy scan mode is automatically selected onboard depending on incoming ion fluxes. At present, only the ion moments in the RAM-A mode are listed for the LEP-EAi data.

The ion moment data of the solar wind analyzer (LEP-SW) should be used only qualitatively. The LEP-SW ion moments are listed when the energy scan mode of LEP-EAi is RAM-B.

Additional information
The Geotail Low Energy Particle Experiment (LEP)

Reprint of Mukai, T., S. Machida, Y. Saito, M. Hirahara, T. Terasawa, N. Kaya, T. Obara, M. Ejiri, and A. Nishida, The low energy particle (LEP) experiment onboard the Geotail satellite, J. Geomag. Geoelectr., 46, 669-692, 1994.

Acknowledgement

In any publications, the use of the Geotail data should be acknowledged, for example, as "Geotail magnetic field data were provided by Y. Saito, JAXA in Japan."

Contact
Role Person
1. Principal investigator spase://Example/Person/Yoshifumi.Saito
2. Scientist spase://Example/Person/Donald.H.Fairfield
3. Metadata contact spase://Example/Person/Jan.Merka
Release date
2009-05-20 23:06:12
Repository #1
Name
spase://Example/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
Access rights
Open
URL
CDAWeb FTP download
Encoding
None
Acknowledgement

Data provider Y. Saito at JAXA, Japan and CDAWeb.

Repository #2
Name
spase://Example/Repository/DARTS
Availability
Online
Access rights
Open
URL
DARTS/Geotail

Data ARchives and Transmission System (DARTS) is a versatile space science data archive for astrophysics, solar physics, and solar-terrestrial physics. DARTS primarily consists of the data acquired by Japanese scientific satellites and spacecrafts. DARTS is developed and maintained by the Center of Science-satellite Operation and Data Archive (C-SODA) at ISAS/JAXA.

Encoding
ASCII
Acknowledgement

In any publications, the use of the Geotail data should be acknowledged, for example, as "Geotail magnetic field data were provided by Y. Saito through DARTS at Institute of Space and Astronautical Science, JAXA in Japan."

Instrument
spase://Example/Instrument/Geotail/LEP
Measurement type
Thermal plasma
Temporal description
Start date
2004-01-01 00:00:00
Stop date
2005-01-01 00:00:00
Cadence
12 seconds
Observed regions
Earth.Magnetosheath
Earth.Magnetosphere
Earth.Magnetosphere.Magnetotail
Heliosphere.NearEarth
Caveats

Please use the Editor-A LEP dataset prior to the Editor-B LEP dataset since plasma moments in the Editor-A data are more reliable. (Plasma moments inthe Editor-B are calculated onboard.)

The ion moment data of the solar wind analyzer (LEP-SW) should be used only qualitatively.

Parameters

Parameter #1

Name
Time Line
Parameter key
Epoch
Description

Number of milliseconds since the CDF epoch

Units
ms
Conversion to SI units
1e-3>s
Valid minimum
12-Nov-1994 00:00:00.000
Valid maximum
31-Dec-2020 00:00:00.000
Fill value
-1.0E31
Parameter type
Temporal

Parameter #2

Name
Ion density
Parameter key
Ni
Description

Ion density

Caveats

Qualitative use only if Energy Scan Code = 2, i.e. if the energy scan mode is RAM-B/SW.

Units
cm^-3
Conversion to SI units
1e-6>m-3
Valid minimum
0.0
Fill value
-1.0E31
Particle type
Proton
AlphaParticle
Ion
Quantity
Number density
Energy range
Low energy
60
High energy
38150
Units
eV

Parameter #3

Name
Ion temperature
Parameter key
T
Description

Ion temperature in satellite coordinates

Caveats

Qualitative use only if Energy Scan Code = 2, i.e. if the energy scan mode is RAM-B/SW.

Units
eV
Coordinate system
Cartesian SC
Structure
Size
2
Elements
Index Name Valid min Valid max Fill value
1 Ti,yy -10 10000 -1.0E31
2 Ti,zz -10 10000 -1.0E31
Particle type
Proton
AlphaParticle
Ion
Quantity
Temperature
Energy range
Low energy
60
High energy
38150
Units
eV

Parameter #4

Name
Sensor
Parameter key
Sensor
Description

Name of the instrument sensor measuring data.

Fill value
-1.0E31
Parameter type
Other

Parameter #5

Name
Mode
Parameter key
scan_code
Description

Energy scan code/mode:

  • 1 = sensor EA = energy scan mode RAM-A
  • 2 = sensor SW = energy scan mode RAM-B
Valid minimum
1
Valid maximum
2
Parameter type
Other

Parameter #6

Name
Ion velocity (GSE)
Parameter key
VGSE
Description

Ion velocity in GSE coordinates

Caveats

Qualitative use only if Energy Scan Code = 2, i.e. if the energy scan mode is RAM-B/SW.

Units
km/s
Conversion to SI units
1e3>m/s
Coordinate system
Cartesian GSE
Structure
Size
3
Elements
Index Name Component Valid min Valid max Fill value
1 Vxi (GSE) I -2000 2000 -1.0E31
2 Vyi (GSE) J -2000 2000 -1.0E31
3 Vzi (GSE) K -2000 2000 -1.0E31
Particle type
Proton
AlphaParticle
Ion
Quantity
Flow velocity
Energy range
Low energy
60
High energy
38150
Units
eV

Parameter #7

Name
Geotail position (GSE)
Parameter key
XYZGSE
Description

Geotail position in GSE cartesian coordinates

Caveats

1 Re = 6371.2 km

Units
Re
Conversion to SI units
6.3712e6>m
Coordinate system
Cartesian GSE
Structure
Size
3
Elements
Index Name Component Valid min Valid max Fill value
1 X (GSE) I -500.0 500.0 -1.0E31
2 Y (GSE) J -500.0 500.0 -1.0E31
3 Z (GSE) K -500.0 500.0 -1.0E31
Parameter type
Positional
Qualifier
Vector

Parameter #8

Name
Ion velocity (GSM)
Parameter key
VGSM
Description

Ion velocity in GSM coordinates

Caveats

Qualitative use only if Energy Scan Code = 2, i.e. if the energy scan mode is RAM-B/SW.

Units
km/s
Conversion to SI units
1e3>m/s
Coordinate system
Cartesian GSM
Structure
Size
3
Elements
Index Name Component Valid min Valid max Fill value
1 Vxi (GSM) I -2000 2000 -1.0E31
2 Vyi (GSM) J -2000 2000 -1.0E31
3 Vzi (GSM) K -2000 2000 -1.0E31
Particle type
Proton
AlphaParticle
Ion
Quantity
Flow velocity
Energy range
Low energy
60
High energy
38150
Units
eV

Parameter #9

Name
Geotail position (GSM)
Parameter key
XYZGSM
Description

Geotail position in GSM cartesian coordinates

Caveats

1 Re = 6371.2 km

Units
Re
Conversion to SI units
6.3712e6>m
Coordinate system
Cartesian GSM
Structure
Size
3
Elements
Index Name Component Valid min Valid max Fill value
1 X (GSM) I -500.0 500.0 -1.0E31
2 Y (GSM) J -500.0 500.0 -1.0E31
3 Z (GSM) K -500.0 500.0 -1.0E31
Parameter type
Positional
Qualifier
Vector

Parameter #10

Name
Ion velocity (SM)
Parameter key
VSM
Description

Ion velocity in SM coordinates

Caveats

Qualitative use only if Energy Scan Code = 2, i.e. if the energy scan mode is RAM-B/SW.

Units
km/s
Conversion to SI units
1e3>m/s
Coordinate system
Cartesian SM
Structure
Size
3
Elements
Index Name Component Valid min Valid max Fill value
1 Vxi (SM) I -2000 2000 -1.0E31
2 Vyi (SM) J -2000 2000 -1.0E31
3 Vzi (SM) K -2000 2000 -1.0E31
Particle type
Proton
AlphaParticle
Ion
Quantity
Flow velocity
Energy range
Low energy
60
High energy
38150
Units
eV

Parameter #11

Name
Geotail position (SM)
Parameter key
XYZSM
Description

Geotail position in SM cartesian coordinates

Caveats

1 Re = 6371.2 km

Units
Re
Conversion to SI units
6.3712e6>m
Coordinate system
Cartesian SM
Structure
Size
3
Elements
Index Name Component Valid min Valid max Fill value
1 X (SM) I -500.0 500.0 -1.0E31
2 Y (SM) J -500.0 500.0 -1.0E31
3 Z (SM) K -500.0 500.0 -1.0E31
Parameter type
Positional
Qualifier
Vector