SuperMAG Lower Index (SML) Onsets List

SML Onsets List

https://doi.org/10.48322/v3c2-4a19

2021-11-25 00:00:00.000

This catalog has a list of SuperMAG lower index (SML) substorm Onsets Events observed by the SuperMAG ground magnetometers. This list consists of 118,522 events where it was possible to determine the time of onset of the negative bay and several attributes of these bays.

Robert L. McPherron. Data used in this work were obtained from several sources identified here by name and URL: World Data Center for Geomagnetism, http://wdc.kugi.kyoto-u.ac.jp/; National Space Science Data Center, https://nssdc.gsfc.nasa.gov/; SuperMAG Project, https://SuperMAG.jhuapl.edu. Detailed acknowledgment guidelines are provided at http://supermag.jhuapl.edu/acknowledgment.html. If data downloaded from the VMO Data Repository are used in publication kindly acknowledge the Virtual Magnetospheric Observatory, Earth, Planetary and Space Science Department, University of California, Los Angeles for providing access to the data.

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1966-11-17 23:13:00Z

2020-12-31 21:50:00Z

This list consists of 118,522 events where it was possible to determine the time of onset of the negative bay and several attributes of these bays.

Onset Year

Column 1

Year of the substorm onset

years

1966

2020

Onset month

Column 2

Month of the substorm onset

months

1

12

Onset month day

Column 3

Day of the month of the substorm onset

days

1

31

Onset hour

Column 4

Hour of the substorm onset

hours

0

24

Onset minute

Column 5

Minute of the substorm onset

minutes

0

59

Onset second

Column 6

Second of the substorm onset (always zero)

seconds

0

0

NB

Column 7

Index in SML series of start of segment. The index values correspond to the number of minutes from the start of the file of SML data to a given record. This file starts with record 1 at [1966, 1,1, 0, 0, 0]. For several reasons our first onset occurs late in the year at '17-Nov-1966 23:13:00' and the last onset is at '31-Dec-2020 21:50:00'.

minutes

0

28928037

NE

Column 8

Index in SML series of end of segment. The index values correspond to the number of minutes from the start of the file of SML data to a given record. This file starts with record 1 at [1966, 1,1, 0, 0, 0]. For several reasons our first onset occurs late in the year at '17-Nov-1966 23:13:00' and the last onset is at '31-Dec-2020 21:50:00'.

minutes

0

28928055

IO

Column 9

The index of the onset. The index values correspond to the number of minutes from the start of the file of SML data to a given record. This file starts with record 1 at [1966, 1,1, 0, 0, 0]. For several reasons our first onset occurs late in the year at '17-Nov-1966 23:13:00' and the last onset is at '31-Dec-2020 21:50:00'.

minutes

0

28928031

IN

Column 10

The index at minimum. The index values correspond to the number of minutes from the start of the file of SML data to a given record. This file starts with record 1 at [1966, 1,1, 0, 0, 0]. For several reasons our first onset occurs late in the year at '17-Nov-1966 23:13:00' and the last onset is at '31-Dec-2020 21:50:00'.

minutes

0

57856068

valo

Column 11

The value of SML at onset

nT

valn

Column 12

The value of SML at minimum

nT

dels

Column 13

The magnitude of the SML decrease

nT

durx

column 14

Duration of expansion phase in integer minutes

minutes