single event upset (seu) study of seastar, and the map anomaly · 3-nov 4-nov 5-nov 6-nov 7-nov...
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Single Event Upset (SEU) Study of Seastar, and the MAP Anomaly
C. Poivey, J. Barth, G. Gee, H. Safren,K. LaBel, C. Dyer, A. Campbell
2002 SEE SymposiumLos Angeles, CA April 23-25, 2002
Work sponsored by NASA ERC program and DTRA
2
Outline
• Introduction• SEASTAR flight data
• Map Anonaly• Conclusion
3
Introduction
• SEASTAR in flight SEU performance were presented in SEE2000 symposium. We present an update that shows the effect of the solar activity and Solar Particle Events (SPE).
• Then we present the the anomaly on the Microwave Anisotropy Probe (MAP) that has been probably caused by solar heavy ions.
4
SeaStar MissionAltitude:
705 km - 705kmInclination:
98.2°Dates: September
1997 - Present• Data from 1/1/1999 to
3/12/2002 has been analyzed for this study
Technology: • FDR1&2 - Seakr Solid State
Recorders (SSR) w/ 64MB of Memory– EDAC (16,22) Modified Hamming
Code - single bit correct, double bit detect
– Telemetry gathered at 10 second intervals
– Watchdog timer w/ soft reset - 1 second timeout
• DRAM - Hitachi MDM1400G-120, 4megabit x 1bit– 220 DRAMs per FDR– designed in 1994; now obsolete and
hard to find
5
SEASTAR FDR Number of SEU per Day
0
200
400
600
800
1000
1200
1400
1/1/19
99
3/1/19
99
5/1/19
99
7/1/19
99
9/1/19
99
11/1/
1999
1/1/20
00
3/1/20
00
5/1/20
00
7/1/20
00
9/1/20
00
11/1/
2000
1/1/20
01
3/1/20
01
5/1/20
01
7/1/20
01
9/1/20
01
11/1/
2001
1/1/20
02
3/1/20
02
Nu
mb
er o
f S
EU
July 14-15, 2000
November 9-10, 2000
4/15/2001
9/25/2001
November 5-6,2001
6
Solar protons flux - 2000
0.01
0.1
1
10
100
1000
10000
1/1/20
00
2/1/20
00
3/1/20
00
4/1/20
00
5/1/20
00
6/1/20
00
7/1/20
00
8/1/20
00
9/1/20
00
10/1/
2000
11/1/
2000
12/1/
2000
Pro
ton
s in
teg
ral f
lux
(#/c
m2-
s)
>100MeV> 60 MeV> 50 MeV>30 MeV
7
Solar protons 2001
0.01
0.1
1
10
100
1000
100001/
1/20
01
2/1/
2001
3/1/
2001
4/1/
2001
5/1/
2001
6/1/
2001
7/1/
2001
8/1/
2001
9/1/
2001
10/1
/200
1
11/1
/200
1
12/1
/200
1
Inte
gra
l Flu
x (#
/cm
2-s)
>100MeV>60MeV>50MeV>30MeV
8
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
7/14/2
000
7/15/2
000
11/9/
2000
11/10
/2000
4/15/2
001
9/25/2
001
11/5/
2001
11/6/
2001
Inte
gra
l pro
ton
flu
x (#
/cm
2 -s)
>10MeV >30 MeV >50MeV >60MeV >100MeV
1188 SEU
633 SEU1207 SEU
229 SEU
466 SEU
342 SEU
468 SEU477 SEU
9
0.00
200.00
400.00
600.00
800.00
1000.00
1200.00
1400.00
7/14
/200
0
7/15
/200
0
11/9
/200
0
11/1
0/20
00
4/15
/200
1
9/25
/200
1
11/5
/200
1
11/6
/200
1
Nu
mb
er o
f S
EU
FD
R 1
&2
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
160.00
Inte
gra
l pro
ton
flu
x >
100
MeV
(#/
cm2-
s)
number of SEUprotons>100MeV
10
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
-180 -160 -140 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 140 160 180
Longitude
Lat
itu
de
Typical day 7/13/200: ~ 80% of SEU occur in SAA
Protons > 10 MeV, Flux>10p/cm2-s
11
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
-180 -160 -140 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 140 160 180
Longitude
Lat
itu
de
Solar Event 7/14/2000
Protons > 10 MeV, Flux>10p/cm2-s
12
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
-180 -160 -140 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 140 160 180
Longitude
Lat
itu
de
Protons > 10 MeV, Flux>10p/cm2-s
Solar Event: 7/14-15/2000
13
0
30
60
90
- 30
- 60
- 90
Errors per cell ofarea 4000 sq . km.
20 or more5- 192- 41
0 30 60 90 120 150 180- 30- 60- 90- 120- 150- 180
SeaStar Satellite : SEUs at 705 Km AltitudeH10 - second transmissions only LJanuary 1, 1999 - Mar . 14 , 2002
Seastar- Geographic Plot of Single Hits
Longitude
Latit
ude
14
SEASTAR FDR1&2, Number of SEU per Day
0
50
100
150
200
250
300
350
1/1/19
99
3/1/19
99
5/1/19
99
7/1/19
99
9/1/19
99
11/1/1
999
1/1/20
00
3/1/20
00
5/1/20
00
7/1/20
00
9/1/20
00
11/1/2
000
1/1/20
01
3/1/20
01
5/1/20
01
7/1/20
01
9/1/20
01
11/1/2
001
1/1/20
02
3/1/20
02
Num
ber
of S
EU
15
SEASTAR FDR1&2 monthly average
0
50
100
150
200
250
300
Jan-
99F
eb-9
9M
ar-9
9A
pr-9
9M
ay-9
9Ju
n-99
Jul-9
9A
ug-9
9S
ep-9
9O
ct-9
9N
ov-9
9D
ec-9
9Ja
n-00
Feb
-00
Mar
-00
Apr
-00
May
-00
Jun-
00Ju
l-00
Aug
-00
Sep
-00
Oct
-00
Nov
-00
Dec
-00
Jan-
01F
eb-0
1M
ar-0
1A
pr-0
1M
ay-0
1Ju
n-01
Jul-0
1A
ug-0
1S
ep-0
1O
ct-0
1N
ov-0
1D
ec-0
1Ja
n-02
Feb
-02
Nu
mb
er o
f S
EU
(S
EU
/day
)
50
60
70
80
90
100
110
120
130
140
150
Sm
oo
thed
su
nsp
ot
nu
mb
er
Average 1999: 246Average 2000:214
Average 2001:194
16
Conclusion SEASTAR
• The data collected shows a significant sensitivity to solar protons.
• But only high energy protons (>100 MeV). This suggests a significant amount of shielding.
• The data also shows the fluctuation of the SEU numbers (and therefore the trapped proton fluxes) with the solar activity.
17
Study of the MicroWave Anisotropy Probe (MAP) anomaly
• Launched June 30, 2001• Reached final position on L2 end of September, 2001.• Reset of spacecraft processor on November 5, 2001.
R=3.6k
LM139
LM139
LM139
R=5.1k
R=10k
R=1.5k
R=1k
R=100k
10 ? F
Vref2.5V
Vref2.5V
Vref2.5V
+5V
+5V
AC14
AC14
AC14
AC14
AC14AC14
18
0.5 to 4~1.5E-3
#/comparator-day#/comparator-day
Solar EventSET rateCREME 96Worst week
GCR SET rateCREME96Solar maximum
LM139 SET rate on L2 (200mV differential input voltage)
19
FAWKE SOLAR EVENT
0.01
0.1
1
10
100
1000
10000
3-Nov 4-Nov 5-Nov 6-Nov 7-Nov 8-Nov 9-Nov 10-Nov 11-Nov
Inte
gra
l Pro
ton
flu
x (#
cm2 -s
)
>10MeV>30MeV>50MeV
>60MeV>100MeV
20
Integral LET Spectra at 1AU (Z=1-92) 100 mils Aluminum Shielding, CREME96
1.00E-10
1.00E-09
1.00E-08
1.00E-07
1.00E-06
1.00E-05
1.00E-04
1.00E-03
1.00E-02
1.00E-01
1.00E+00
1.00E+01
1.00E+02
1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
LET energy (MeV-cm2/mg)
LE
T f
luen
ce (
#/cm
2 -s)
SPE 5' average over peak
SPE worst day
SPE worst week
GCR solmin
GCR solmax
MPTB data fawke event (2926-2931)
MPTB data, peak event (2929)
21
Conclusion MAP• A heavy ion SET on the PM139 is the
probable cause for the anomaly.• Measurements from the CREDO LET
instrument have been very useful for identifying the cause of the reset.
• A possibility of a GCR induced SET can not be discounted.
• This anomaly demonstrates the need for accurate space environment information.
• The study of future resets will allow to give a more accurate information.