# Tohban Notes on 2020-09-13 - 2020-09-22

Geomagnetic activity overview

2020-09-14 - 2020-09-15          Moderate storm, the provisional Dst minimum of -61 nT at ~ 0800 UT on 09/15.

2020-09-13/22:00 - 24:00 UT      AE/AL activation with AE max ~ 500 nT;
2020-09-14/00:00 - 06:00 UT      Periodic AE/AL activations with AE > 500 nT; 
2020-09-14/11:00 - 13:00 UT      Substorm with AE max ~ 700 nT (AL min ~ -600 nT).
2020-09-15/09:40 - 11:00 UT      Substorm with AE max ~ 500 nT (AL min ~ -400 nT)
2020-09-17 - 2020-09-22          No activity

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Science notes on ELFIN data

EL-A
2020-09-15/09:55 - 09:56 UT     North Descending  Flux increase, precipitation at LAT ~ 71, MLT ~ 0.1

EL-B
2020-09-13/23:03 - 23:09 UT     North Descending  Increased flux, nearly isotropic (data is too fragmetal by now)

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Data collection (current status)

EL-A

2020-09-13 5 SZ North Descending
2020-09-14 Test only, no science data
2020-09-15 9 SC North Descending
2020-09-16 6 SC North Descending
2020-09-17 9 SC North Descending
2020-09-18 5 SC South Descending
2020-09-19 6 SC South Descending
2020-09-20 6 SC South Descending

Comments
2020-09-13/00:00 - 10:00 UT North Descending, too low parallel, antiparallel fluxes, no full PAD
2020-09-13/05:32 - 05:25 UT North Descending, data gaps
2020-09-13/14:00 - 15:30 UT North Descending, too low parallel, antiparallel fluxes, no full PAD
2020-09-15/01:00 - 08:30 UT North Descending, too low parallel, antiparallel fluxes, no full PAD
2020-09-15/12:00 - 23:30 UT North Descending, too low parallel, antiparallel fluxes, no full PAD
2020-09-16/00:00 - 24:00 UT North Descending, too low parallel, antiparallel fluxes, no full PAD
2020-09-17/00:00 - 24:00 UT North Descending, too low parallel, antiparallel fluxes, no full PAD
2020-09-19/23:33 - 23:38 UT South Descending, data gaps
2020-09-20/04:18 - 04:21 UT South Descending, data gaps
2020-09-20/05:50 - 05:54 UT South Descending, data gaps
2020-09-20/08:56 - 09:00 UT South Descending, data gaps
2020-09-20/22:56 - 23:00 UT South Descending, data gaps

EL-B

2020-09-13 7 SZ North Descending
2020-09-14 Test only, no science data
2020-09-15 7 SC North Descending
2020-09-17 6 SC North Descending
2020-09-18 5 SC North Descending
2020-09-19 4 SC North Descending
2020-09-20 6 SC South Descending

Comments
2020-09-13/19:56 - 20:02 UT North Descending,  data gaps, too fragmental
2020-09-13/23:03 - 23:09 UT North Descending,  data gaps, too fragmental
2020-09-15/00:00 - 00:06 UT North Descending,  data gaps, too fragmental
2020-09-15/01:35 - 01:41 UT North Descending,  data gaps
2020-09-15/10:57 - 11:02 UT North Descending,  data gaps
2020-09-15/12:30 - 12:35 UT North Descending,  data gaps
2020-09-15/14:02 - 14:08 UT North Descending,  data gaps
2020-09-15/17:08 - 17:14 UT North Descending,  data gaps
2020-09-17/01:54 - 02:00 UT North Descending,  data gaps
2020-09-18/12:10 - 12:12 UT North Descending,  too short collection (L~14 - 10)
2020-09-19/11:34 - 11:39 UT North Descending,  data gaps
2020-09-19/13:09 - 13:12 UT North Descending,  data gaps
2020-09-20/04:18 - 04:21 UT South Descending,  data gaps
2020-09-20/05:50 - 05:55 UT South Descending,  data gaps
2020-09-20/08:56 - 09:01 UT South Descending,  data gaps
2020-09-20/22:35 - 23:00 UT South Descending,  data gaps