Table of Contents
Dataset Papers in Science
Volume 2014 (2014), Article ID 684305, 13 pages
http://dx.doi.org/10.1155/2014/684305
Dataset Paper

ECLAT Cluster Spacecraft Magnetotail Plasma Region Identifications (2001–2009)

1Space Research Institute, Austrian Academy of Sciences, 8042 Graz, Austria
2Department of Physics and Astronomy, University of Leicester, LE1 7RH Leicester, UK

Received 25 November 2013; Accepted 18 February 2014; Published 12 August 2014

Academic Editors: M. Iizima and K. Kudela

This dataset has been dedicated to the public domain using the CC0 waiver.

Dataset http://dx.doi.org/10.1155/2014/684305/dataset

Dataset

Dataset Item 1 (Table). ASCII file for each spacecraft (C1, C2, C3, and C4) at years 2001–2005. The file contains a continuous time series epoch ordered tabulated list of plasma regions encountered by the spacecraft covering the four tail session months (July–October) of the dataset. Each record in the file represents one plasma region encounter, with the entry and exit of the region and averaged characteristic plasma and magnetic field parameters. The parameters and their representation have been chosen through consultation with the expected user communities and are expected to fully describe the average region characteristics and activity levels needed to fully understand these plasma regimes. The Region Interval column presents the ISO time range, entry and exit time, of each plasma region, for example, 2001-10-28T00:00:00.000Z/2001-10-28T02:08:31.087Z (corresponding to a region entry time of year 2001, month 10, day 28, hour 00, minute 00, second 00, and milliseconds 000, and a region exit time of year 2001, month 10, day 28, hour 02, minute 08, second 31, and milliseconds 087). Merged CAA Cluster moments (spin resolution, 4 seconds) are used in region identification such that time tags of each plasma region are the time tags of the first Cluster magnetic field moment (FGM) meeting the region criteria and the last one meeting the criteria before region change. The first region entry time for each day of the year is of the form, for example, 2001-10-28T00:00:00.000Z, and the last region exit time of each day will be of the form, for example, 2001-10-28T23:59:59.999Z. The Region Name column represents which region has been encountered and incorporates which magnetic hemisphere the region belongs to or in the case of NSR regions the direction of the crossing. The Mean column represents the mean value of the FGM component () of the magnetic field in the region interval. The SD of column represents the standard deviation of FGM (GSM) in the region interval. The Mean column represents the mean FGM (GSM) component in the region interval. The Minimum and Maximum columns represent the minimum and maximum values of the (GSM) component of the magnetic field in the region. The Mean Density column represents the mean value of the plasma density (electron or ion density, depending on the plasma instrument used) in the region interval. The Mean Total Pressure column represents the mean value of the total pressure in the region interval, . The Median Plasma Beta column represents the median value of plasma beta (ion beta-HIA or CODIF or electron beta-PEACE, depending on the instrument used) in the region interval. The High Vpar and Vperp Percent columns represent the percentage of data points in the region interval recording high speed parallel and perpendicular flow speeds, respectively. The Minimum and Maximum Vx columns represent the minimum and maximum values of the x component of the plasma flow in the region interval. The Spacecraft X Location, Spacecraft Y Location, and Spacecraft Z Location columns, respectively, represent the X, Y, and Z locations of the spacecraft at the time of region entry, in GSM coordinates and units of Earth radii. The NS Crossings Number column indicates the number of multiple neutral sheet crossings in the interval, determined from the FGM 5 Hz (200 ms) high resolution dataset. The Number of Data Points column shows the number of data points in the region interval (nearest neighbour merged FGM and plasma moments data). The Minimum and Maximum Time Interval columns, respectively, represent the minimum and maximum time intervals between data points in the region to the nearest second. They provide information on the accuracy of region determination. If the minimum resolution of the data points within the region is large (maximum 32 seconds) then the user may wish to examine this interval more carefully. The Number of Gaps column indicates the number of times the time interval between data points in the region interval is greater than half the allowed time gap between data points before the region is split into two with a data gap (UR) region record (allowed gap = 32 seconds), giving more information on the accuracy of the region determination. If the value of n_gaps/n is large, it is recommended that the user should treat the region with caution. The UR Flag column gives the reason for a UR record (values—0: this is not a UR record; 1: missing FGM moments; 2: missing plasma moments; 3: missing both FGM and plasma moments; 4: spacecraft outside of tail region box , ; 5, 6, and 7: flag 4 + flags 1–3 (i.e., the spacecraft is outside the tail box for some period of the UR region; there are also missing FGM moments (flag 5), missing plasma moments (flag 6), or missing both FGM and plasma moments (flag 7)); 8: FGM instrument caveats found during the period; 9: plasma instrument caveats found during the period; 10: plasma and/or FGM instrument is in the wrong operation mode (e.g., calibration/test mode; see list of instrument modes in CAA instrument documentation); 11: possible magnetosheath entry; 12: region has been removed due to very high density in the flanks of the tail ( plasma density > 10 particles/cm3 or plasma density > 2 particles/cm3); 13: NSR interval removed to UR when spacecraft (e.g., crossing of magnetopause into the solar wind, not a crossing of the NS); 14: C2 interval in which other spacecraft record magnetosheath entry (UR flag 11 or 12 seen by C1, C3, or C4), applied only in 2001–2004 (when the spacecraft are close); 15: solar proton event recorded in interval). The Instrument Quality Flag column describes the plasma and magnetic field instrument CAA standard quality flags for the interval (values—0: not applicable; both FGM and plasma instrument quality flags are set to 0; 1: known problems; either FGM or plasma instrument quality flag is set to 1 (known problems) or 2 (survey data); 3: good for publication, subject to PI approval; if FGM and plasma quality flag are both set to 3 (good for publication, subject to PI approval) or 4 (excellent data); 10: flag for other known issues, always set for C4 regions after 2003, when data quality degrades). The Comment Flag column describes statistically unusual regions, and for NSR regions the plasma regions (IPS, OPS, etc.) encountered on the crossing (values—0: no comment; 1: OPS region with high beta data points (>1 for ions, ratio for electrons); 2: IPS region contains data points with low beta data points (<1 for ions, ratio for electrons); 3: IPS region with minimum beta in the statistical BR beta range; 4: IPS region with minimum beta in the lobe beta range; 5: lobe region containing data points where the plasma density measured is below the instrument threshold (i.e., CAA moments record density of 0) may result in no beta or averaged plasma parameters in region record; 6: lobe region with density typical of plasma sheet, density >0.1 cm−3; 7: region in the flanks () with unusually high density (>1 cm−3); 8–12: records which plasma region was removed to a UR region when extreme density condition is met (UR flag condition 12). 8 = NSR, 9 = IPS, 10 = OPS, 11 = BR, and 12 = LOBE; 13: C2 region in the flanks ; 14: C2 region in the flanks is lobe with high density (>0.1 cm−3); 66–99: the plasma region covered by NSR regions (66: NSR region contains IPS data points only; 67: NSR region contains IPS and OPS data points; 68: NSR region contains IPS and BR data points; 69: NSR region contains IPS and LOBE data points; 77: NSR region contains OPS data points only; 78: NSR region contains OPS and BR data points; 79: NSR region contains OPS and LOBE data points; 88: NSR region contains BR data points only; 89: NSR region contains BR and LOBE data points; 99: NSR region contains LOBE data points only)). The Instrument ID column is the ID of the plasma instrument used (0: not applicable; 1: CIS-CODIF_H1; 2: CIS-HIA; 3: PEACE).

  • Column 1: Year
  • Column 2: Spacecraft Number
  • Column 3: Region Interval
  • Column 4: Region Name
  • Column 5: Mean (nT)
  • Column 6: SD of (nT)
  • Column 7: Mean (nT)
  • Column 8: Minimum (nT)
  • Column 9: Maximum (nT)
  • Column 10: Mean Density (cm)
  • Column 11: Mean Total Pressure (nPa)
  • Column 12: Median Plasma Beta
  • Column 13: High Vpar Percent (%)
  • Column 14: High Vperp Percent (%)
  • Column 15: Minimum Vx (km s-1)
  • Column 16: Maximum Vx (km s-1)
  • Column 17: Spacecraft X Location (RE)
  • Column 18: Spacecraft Y Location (RE)
  • Column 19: Spacecraft Z Location (RE)
  • Column 20: NS Crossings Number
  • Column 21: Number of Data Points
  • Column 22: Minimum Time Interval (s)
  • Column 23: Maximum Time Interval (s)
  • Column 24: Number of Gaps
  • Column 25: UR Flag
  • Column 26: Instrument Quality Flag
  • Column 27: Comment Flag
  • Column 28: Instrument ID

Dataset Item 2 (Table). ASCII file for each spacecraft (C1, C2, C3, and C4) at years 2006–2009. The file contains a continuous time series epoch ordered tabulated list of plasma regions encountered by the spacecraft covering the four tail session months (July–October) of the dataset. Each record in the file represents one plasma region encounter, with the entry and exit of the region and averaged characteristic plasma and magnetic field parameters. The parameters and their representation have been chosen through consultation with the expected user communities and are expected to fully describe the average region characteristics and activity levels needed to fully understand these plasma regimes. The Region Interval column presents the ISO time range, entry and exit time, of each plasma region, for example, 2001-10-28T00:00:00.000Z/2001-10-28T02:08:31.087Z (corresponding to a region entry time of year 2001, month 10, day 28, hour 00, minute 00, second 00, and milliseconds 000, and a region exit time of year 2001, month 10, day 28, hour 02, minute 08, second 31, and milliseconds 087). Merged CAA Cluster moments (spin resolution, 4 seconds) are used in region identification such that time tags of each plasma region are the time tags of the first Cluster magnetic field moment (FGM) meeting the region criteria and the last one meeting the criteria before region change. The first region entry time for each day of the year is of the form, for example, 2001-10-28T00:00:00.000Z, and the last region exit time of each day will be of the form, for example, 2001-10-28T23:59:59.999Z. The Region Name column represents which region has been encountered and incorporates which magnetic hemisphere the region belongs to or in the case of NSR regions the direction of the crossing. The Mean column represents the mean value of the FGM component () of the magnetic field in the region interval. The SD of column represents the standard deviation of FGM (GSM) in the region interval. The Mean column represents the mean FGM (GSM) component in the region interval. The Minimum and Maximum columns represent the minimum and maximum values of the (GSM) component of the magnetic field in the region. The Mean Density column represents the mean value of the plasma density (electron or ion density, depending on the plasma instrument used) in the region interval. The Mean Total Pressure column represents the mean value of the total pressure in the region interval, . The Median Plasma Beta column represents the median value of plasma beta (ion beta-HIA or CODIF or electron beta-PEACE, depending on the instrument used) in the region interval. The High Vpar and Vperp Percent columns represent the percentage of data points in the region interval recording high speed parallel and perpendicular flow speeds, respectively. The Minimum and Maximum Vx columns represent the minimum and maximum values of the x component of the plasma flow in the region interval. The Spacecraft X Location, Spacecraft Y Location, and Spacecraft Z Location columns, respectively, represent the X, Y, and Z locations of the spacecraft at the time of region entry, in GSM coordinates and units of Earth radii. The NS Crossings Number column indicates the number of multiple neutral sheet crossings in the interval, determined from the FGM 5 Hz (200 ms) high resolution dataset. The Number of Data Points column shows the number of data points in the region interval (nearest neighbour merged FGM and plasma moments data). The Minimum and Maximum Time Interval columns, respectively, represent the minimum and maximum time intervals between data points in the region to the nearest second. They provide information on the accuracy of region determination. If the minimum resolution of the data points within the region is large (maximum 32 seconds) then the user may wish to examine this interval more carefully. The Number of Gaps column indicates the number of times the time interval between data points in the region interval is greater than half the allowed time gap between data points before the region is split into two with a data gap (UR) region record (allowed gap = 32 seconds), giving more information on the accuracy of the region determination. If the value of n_gaps/n is large, it is recommended that the user should treat the region with caution. The UR Flag column gives the reason for a UR record (values—0: this is not a UR record; 1: missing FGM moments; 2: missing plasma moments; 3: missing both FGM and plasma moments; 4: spacecraft outside of tail region box , ; 5, 6, and 7: flag 4 + flags 1–3 (i.e., the spacecraft is outside the tail box for some period of the UR region; there are also missing FGM moments (flag 5), missing plasma moments (flag 6), or missing both FGM and plasma moments (flag 7)); 8: FGM instrument caveats found during the period; 9: plasma instrument caveats found during the period; 10: plasma and/or FGM instrument is in the wrong operation mode (e.g., calibration/test mode; see list of instrument modes in CAA instrument documentation); 11: possible magnetosheath entry; 12: region has been removed due to very high density in the flanks of the tail ( plasma density > 10 particles/cm3 or plasma density > 2 particles/cm3); 13: NSR interval removed to UR when spacecraft (e.g., crossing of magnetopause into the solar wind, not a crossing of the NS); 14: C2 interval in which other spacecraft record magnetosheath entry (UR flag 11 or 12 seen by C1, C3, or C4), applied only in 2001–2004 (when the spacecraft are close); 15: solar proton event recorded in interval). The Instrument Quality Flag column describes the plasma and magnetic field instrument CAA standard quality flags for the interval (values—0: not applicable; both FGM and plasma instrument quality flags are set to 0; 1: known problems; either FGM or plasma instrument quality flag is set to 1 (known problems) or 2 (survey data); 3: good for publication, subject to PI approval; if FGM and plasma quality flag are both set to 3 (good for publication, subject to PI approval) or 4 (excellent data); 10: flag for other known issues, always set for C4 regions after 2003, when data quality degrades). The Comment Flag column describes statistically unusual regions, and for NSR regions the plasma regions (IPS, OPS, etc.) encountered on the crossing (values—0: no comment; 1: OPS region with high beta data points (>1 for ions, ratio for electrons); 2: IPS region contains data points with low beta data points (<1 for ions, ratio for electrons); 3: IPS region with minimum beta in the statistical BR beta range; 4: IPS region with minimum beta in the lobe beta range; 5: lobe region containing data points where the plasma density measured is below the instrument threshold (i.e., CAA moments record density of 0) may result in no beta or averaged plasma parameters in region record; 6: lobe region with density typical of plasma sheet, density >0.1 cm−3; 7: region in the flanks () with unusually high density (>1 cm−3); 8–12: records which plasma region was removed to a UR region when extreme density condition is met (UR flag condition 12). 8 = NSR, 9 = IPS, 10 = OPS, 11 = BR, and 12 = LOBE; 13: C2 region in the flanks ; 14: C2 region in the flanks is lobe with high density (>0.1 cm−3); 66–99: the plasma region covered by NSR regions (66: NSR region contains IPS data points only; 67: NSR region contains IPS and OPS data points; 68: NSR region contains IPS and BR data points; 69: NSR region contains IPS and LOBE data points; 77: NSR region contains OPS data points only; 78: NSR region contains OPS and BR data points; 79: NSR region contains OPS and LOBE data points; 88: NSR region contains BR data points only; 89: NSR region contains BR and LOBE data points; 99: NSR region contains LOBE data points only)). The Instrument ID column is the ID of the plasma instrument used (0: not applicable; 1: CIS-CODIF_H1; 2: CIS-HIA; 3: PEACE).

  • Column 1: Year
  • Column 2: Spacecraft Number
  • Column 3: Region Interval
  • Column 4: Region Name
  • Column 5: Mean (nT)
  • Column 6: SD of (nT)
  • Column 7: Mean (nT)
  • Column 8: Minimum (nT)
  • Column 9: Maximum (nT)
  • Column 10: Mean Density (cm)
  • Column 11: Mean Total Pressure (nPa)
  • Column 12: Median Plasma Beta
  • Column 13: High Vpar Percent (%)
  • Column 14: High Vperp Percent (%)
  • Column 15: Minimum Vx (km s-1)
  • Column 16: Maximum Vx (km s-1)
  • Column 17: Spacecraft X Location (RE)
  • Column 18: Spacecraft Y Location (RE)
  • Column 19: Spacecraft Z Location (RE)
  • Column 20: NS Crossings Number
  • Column 21: Number of Data Points
  • Column 22: Minimum Time Interval (s)
  • Column 23: Maximum Time Interval (s)
  • Column 24: Number of Gaps
  • Column 25: UR Flag
  • Column 26: Instrument Quality Flag
  • Column 27: Comment Flag
  • Column 28: Instrument ID