Problem #1: Burst mode events

Description

Some events can be triggered at the end of PAS burst mode period

2021/06/11 22:06

==============================================
SWA EVENTS for 2021-06-11 : Low/Med/High without HIS ones
==============================================
APID ( 99, 7) TM (  5,  2) SEQ (05632,3) Size =     6  2021-06-11T22:06:06.454 : SID 43533 : SWA_E_PAS_MISS_HEAD_SCI_PKT
APID ( 99, 7) TM (  5,  2) SEQ (05633,3) Size =     6  2021-06-11T22:06:10.173 : SID 43563 : SWA_E_EXOS_LL_EVENT
APID ( 99, 7) TM (  5,  2) SEQ (05634,3) Size =     4  2021-06-11T22:06:14.451 : SID 43529 : SWA_E_PAS_WR_SCI_HEAD

See http://solarorbiter.irap.omp.eu/tests/aux/20210611/SWA_EVENT.txt

Corresponding plot

documents/BURST/20210611.burst-event.png

Problem #2: Missing FS during burst mode sequences

2021/06/21 Problem identified

The problem was identified!

It seems there is a problem onboard during compression process, and the corresponding data packets are not complete.

When uncompressing some full-sampling data (burst-mode or snapshots) with 80 energies x 7 elevation x 9 CEM, it should produce an uncompressed data buffer of 80 x 7 x 9 (int_16) = 12320 bytes

Obviously, in some cases, we got only 12288 bytes.

These packet were identified as "Uncomplete data: compressed_size < expected_size" and rejected by data processing software, that leads to such "Missing FS"

A complete PAS Burst-mode sequence has a duration of 300 samples of 1s each.

Each 1s sample could be:

  • full-sampling, with maximum energy, elevation and azimuth resolution

  • composed of K=4 sub-sampling per second, with lower resolution

In a complete PAS BM sequence, we must find 15 full-sampling, one each 20s.

Exemple of a complete burst-mode sequence

Each Burst mode sequence is composed of :

  • leading full-sampling

  • 19 partial sub-sampling (x K = 4 sub-sampling per seconds)

  • full-sampling

  • 19 partial sub-samplings (x K = 4 sub-samplings)

  • full-sampling

  • etc…

The scheme is repeated 15 times ⇒ 15 * 20 = 300 seconds

We should find a full-sampling for samples #1, 21, 41, 61, …, 281

Caution there is no full-sampling at then end of the sequence

Example 2021/05/31 04:39

The Full_3D pannel indicates such full-sampling samples.

There can be also detected in NB_ENERGY or NB_ELEVATION pannels

documents/BURST/20210531_0439_0446.burst.png

Burst mode configuration

The parameters N=15 , L=19, and K=4 are specified in PAS configuration

APID ( 99, 9) TM (200,250) SEQ (00292,3) Size =    36  2021-05-31T04:05:27.741 : SWA_TM_PARAM_REPORT
0000 : 00 01 30 09 00 1E 00 00 00 00 00 04 00 00 5A 00
0016 : 00 00 00 00 09 00 00 24 00 00 05 00 00 04 00 00
0032 : 13 00 00 0F
----
Param ID                       = 3009 : DynBstParId
DynamicBurst.Channeltron       =    0
DynamicBurst.FirstEnergy       =    4
DynamicBurst.EnergyNum         =   90
DynamicBurst.FirstElev         =    0
DynamicBurst.ElevNum           =    9
DynamicBurst.EnerWinSize       =   36
DynamicBurst.ElWinSize         =    5
DynamicBurst.K                 =    4
DynamicBurst.N                 =   19
DynamicBurst.L                 =   15

Full-sampling statistics

2021/05/31

Burst mode are select each 1/4H (62 times from 04 to 22:30)

We can find the expected number of FS (62/62)

/DATA/SOLAR/DATA/L1/20210531/solo_L1_swa-pas-3db_20210531_V01.cdf
Sample   1 :  62 / 62.0 = 100.00%
Sample  21 :  62 / 62.0 = 100.00%
Sample  41 :  62 / 62.0 = 100.00%
Sample  61 :  62 / 62.0 = 100.00%
Sample  81 :  62 / 62.0 = 100.00%
Sample 101 :  62 / 62.0 = 100.00%
Sample 121 :  62 / 62.0 = 100.00%
Sample 141 :  62 / 62.0 = 100.00%
Sample 161 :  62 / 62.0 = 100.00%
Sample 181 :  62 / 62.0 = 100.00%
Sample 201 :  62 / 62.0 = 100.00%
Sample 221 :  62 / 62.0 = 100.00%
Sample 241 :  62 / 62.0 = 100.00%
Sample 261 :  62 / 62.0 = 100.00%
Sample 281 :  62 / 62.0 = 100.00%

2021/06/01

Here also, burst mode each 1/4H, starting at 16:00

But a DPU reboot occurs at 18:29

However, we could find the expected number of FS (6/6 = 100%)

/DATA/SOLAR/DATA/L1/20210601/solo_L1_swa-pas-3db_20210601_V01.cdf
Sample   1 :   6 / 6.0 = 100.00%
Sample  21 :   6 / 6.0 = 100.00%
Sample  41 :   6 / 6.0 = 100.00%
Sample  61 :   6 / 6.0 = 100.00%
Sample  81 :   6 / 6.0 = 100.00%
Sample 101 :   6 / 6.0 = 100.00%
Sample 121 :   6 / 6.0 = 100.00%
Sample 141 :   6 / 6.0 = 100.00%
Sample 161 :   6 / 6.0 = 100.00%
Sample 181 :   6 / 6.0 = 100.00%
Sample 201 :   6 / 6.0 = 100.00%
Sample 221 :   6 / 6.0 = 100.00%
Sample 241 :   6 / 6.0 = 100.00%
Sample 261 :   6 / 6.0 = 100.00%
Sample 281 :   6 / 6.0 = 100.00%

Uncomplete burst-mode sequence

After the latest DPU reboot, PAS configuration parameters for Burst mode sequence were modified.

The following parameters were updated:

  • FirstEnergy: from 4 to 14

  • EnegyNums: from 90 to 80

  • FirstElev: from 0 to 1

  • ElevNum: from 9 to 7

Burst mode was also no more selected than 2 times per day.

APID ( 99, 9) TM (200,250) SEQ (00004,3) Size =    36  2021-06-10T00:08:03.649 : SWA_TM_PARAM_REPORT
0000 : 00 01 30 09 00 1E 00 00 00 00 00 0E 00 00 50 00
0016 : 00 01 00 00 07 00 00 24 00 00 05 00 00 04 00 00
0032 : 13 00 00 0F
----
Param ID                       = 3009 : DynBstParId (30 bytes)
DynamicBurst.Channeltron       =    0
DynamicBurst.FirstEnergy       =   14
DynamicBurst.EnergyNum         =   80
DynamicBurst.FirstElev         =    1
DynamicBurst.ElevNum           =    7
DynamicBurst.EnerWinSize       =   36
DynamicBurst.ElWinSize         =    5
DynamicBurst.K                 =    4
DynamicBurst.N                 =   19
DynamicBurst.L                 =   15
----

2021/06/10

We can see here missing FS during the first BM sequence.

We should have 15 FS (one each 20s), but there are only 8 FS available in PAS telemetry.

First BM 14:27

documents/BURST/20210610_1427.burst.png

Same problem during the second sequence, only 9/15 FS.

We received also some events (see problem #1).

Second BM 22:00

documents/BURST/20210610_2200.burst.png

Statistics

Uncomplete FS (50%) for samples 1, 41, 61, 81, 141, 161

/DATA/SOLAR/DATA/L1/20210610/solo_L1_swa-pas-3db_20210610_V01.cdf
Sample   1 :   1 / 2.0 =  50.00%
Sample  41 :   1 / 2.0 =  50.00%
Sample  61 :   1 / 2.0 =  50.00%
Sample  81 :   1 / 2.0 =  50.00%
Sample 101 :   2 / 2.0 = 100.00%
Sample 121 :   2 / 2.0 = 100.00%
Sample 141 :   1 / 2.0 =  50.00%
Sample 161 :   1 / 2.0 =  50.00%
Sample 181 :   1 / 2.0 =  50.00%
Sample 221 :   2 / 2.0 = 100.00%
Sample 241 :   2 / 2.0 = 100.00%
Sample 261 :   2 / 2.0 = 100.00%

2021/06/11

First BM 14:27

documents/BURST/20210611_1427.burst.png

Second BM 22:00

documents/BURST/20210611_2200.burst.png

Uncomplete FS (50%) but for different samples

/DATA/SOLAR/DATA/L1/20210611/solo_L1_swa-pas-3db_20210611_V01.cdf
Sample   1 :   1 / 2.0 =  50.00%
Sample  61 :   2 / 2.0 = 100.00%
Sample  81 :   2 / 2.0 = 100.00%
Sample 101 :   1 / 2.0 =  50.00%
Sample 121 :   2 / 2.0 = 100.00%
Sample 141 :   2 / 2.0 = 100.00%
Sample 161 :   1 / 2.0 =  50.00%
Sample 181 :   1 / 2.0 =  50.00%
Sample 201 :   2 / 2.0 = 100.00%
Sample 221 :   2 / 2.0 = 100.00%
Sample 241 :   1 / 2.0 =  50.00%
Sample 261 :   2 / 2.0 = 100.00%
Sample 281 :   2 / 2.0 = 100.00%

2021/06/12

First BM 14:27

documents/BURST/20210612_1427.burst.png

Second BM 22:00

documents/BURST/20210612_2200.burst.png

Uncomplete FS (50%) but for different samples

/DATA/SOLAR/DATA/L1/20210612/solo_L1_swa-pas-3db_20210612_V01.cdf
Sample   1 :   1 / 2.0 =  50.00%
Sample  21 :   1 / 2.0 =  50.00%
Sample  41 :   2 / 2.0 = 100.00%
Sample  61 :   1 / 2.0 =  50.00%
Sample  81 :   1 / 2.0 =  50.00%
Sample 101 :   1 / 2.0 =  50.00%
Sample 161 :   1 / 2.0 =  50.00%
Sample 181 :   1 / 2.0 =  50.00%
Sample 241 :   1 / 2.0 =  50.00%
Sample 261 :   1 / 2.0 =  50.00%
Sample 281 :   1 / 2.0 =  50.00%