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Mtional Bureau of Standards
Library, N.W. Bldg
JUL S 1964
CRPL-F 238 PART B
Reference book not to be taken from the library.
FOR OFFICIAL USE
PART B
SOLAR - GEOPHYSICAL DATA
ISSUED
JUNE 1964
U. S. DEPARTMENT OF COMMERCE NATIONAL BUREAU OF STANDARDS
CENTRAL RADIO PROPAGATION LABORATORY BOULDER, COLORADO
CRPL-F 238
PART B
NATIONAL BUREAU OF STANDARDS CENTRAL RADIO PROPAGATION LABORATORY
BOULDER, COLORADO
Issued 30 June 1964
SOLAR-GEOPHYSICAL DATA
CONTENTS
I DAILY SOLAR INDICES
(a) Relative Sunspot Numbers and 2800 Mc/s Solar Flux - April - May 1964
(b) Graph of Sunspot Cycle
II SOLAR CENTERS OF ACTIVITY
(a-b) Calcium Plage and Sunspot Regions - May 1964
(c) Magnetic Classifications of Sunspots (Mt. Wilson) - May 1964
(d) Provisional Coronal Line Emission Indices - May 1964
III SOLAR FLARES
(a-f) Optical Observations - May 1964
(g) Flare Patrol Observations - May 1964
(h-i) Optical Observations - February 1964
(j) Flare Patrol Observations - February 1964
(k) Ionospheric Effects (SWF-SEA-SCNA-SPA-SES-SFD-Bursts) - April 1964
(l) 26 Mc/s - Riometer Events (South Pole) - April 1964
IV SOLAR RADIO WAVES
(a) 2800 Mc/s Outstanding Occurrences (ARO-Ottawa) - May 1964
(b) 169 Mc/s Interferometric Occurrences (Nangay) - May 1964
(c) 108 Mc/s Outstanding Occurrences (NBS-Boulder) - May 1964
(d) 7.6-41 Mc/s Spectral Observations (HAO-Boulder) - May 1964
(e-j) 9.1 cm Spectroheliograms (Stanford) - May 1964
V COSMIC RAY INDICES
(a) Climax Neutron Monitor - April 1964
(b) Deep River Neutron Monitor - April 1964
VI GEOMAGNETIC ACTIVITY INDICES
(a) C, Kp, Ap and Selected Quiet and Disturbed Days - April 1964
(b) Chart of Kp by Solar Rotations - 1963-1964
VII RADIO PROPAGATION QUALITY INDICES
(a) CRPL Quality Figures and Forecasts - North Atlantic and
North Pacific - April 1964
(b) Graphs Comparing Forecasts and Observed Quality - North Atlantic and
North Pacific - April 1964
(c-d) Graphs of Useful Frequency Ranges - North Atlantic - April 1964
VIII ALERT PERIODS
(a) IQSY Alert Periods - May 1964
The descriptive text was republished November 1963.
DAILY SOLAR INDICES
May
1964 Zurich Provisional Relative Sunspot
Numbers
RZ
Daily Values Solar Flux at 2800 Me, Ottawa, Canada
Flux
1 7 68.9 2 0 68.4
3 0 69.8 4 10 70.3 5 14 71.9
6 11 70.9 7 10 70.9 8 9 71.5 9 7 70.9
10 7 70.1
n 7 70.1 12 0 69.4 13 0 68.5 14 9 68.3 15 17 68.0
16 17 70.0 17 23 69.6 18 11 70.4 19 9 68.7 20 8 67.7
21 7 68.0 22 18 67.1 23 13 67.3 24 11 68.0 25 11 67.5
26 14 68.4 27 8 67.7 28 8 69.6 29 8 69.1 30 9 68.2 31 9 67.7
Mean; 9.4 69.1
Apr. 1964
American Relative Sunspot Numbers
Ra'
1 0 2 0
3 1 4 0
5 1
6 3
7 8 8 10
9 11 10 10
11 2 12 4
13 3 14 1
15 2
16 0
17 0 18 0
19 1 20 7
21 19 22 16 23 16 24 15 25 12
26 1
27 0 28 0 29 0 30 0
Mean: 4.8
COMMERCE STANDARDS BOULDER
!
Ib
SU38NDN lOdSNflS 03HI00WS
PRED
ICTE
D
AND
OBS
ERV
ED
SUN
SPO
T N
UM
BERS
11 a CALCIUM PLAGE ANI) SUNSPOT REGIONS
MAY 1964
May
1964
LAT. MCMATH PLAGE
NUMBER
RETURN OF
REGION
CALCIUM PLAGE DATA SUNSPOT DATA CMP VALUES HISTORY AGE
(ROTA¬ TIONS)
DATE FIRST SEEN(i)
DURA¬ TION (OATU^
CMP VALUES HISTORY AREA INT AREA COUNT
1.1 N30 7258(2) New 200 1.5 b _ d i 5/1 1
1.9 N06 7255 7201 700 2 1 1 2 4/25 13
2.0 S38 7259 (2) New 100 1.5 b - d 1 5/1 1
2.2 S06 7267 (2) New 200 1 b - d 1 5/3 1
2.5 N25 7271 New (100) (2) b — d 1 5/5 2
2.8 S35 7260 (2) New 100 1.5 b - d 1 5/1 1
3.3 N12 7256 7204 300 2.5 1 1 2 4/26 13
3.5 S 17 7268 New 100 2 b d 1 5/4 2
4.3 N35 7265(3) New 200 2.5 b d 1 5/2 4
5.4 N34 7261 New 300 1 b — d 1 s5 /1 >5
5.4 NO 6 7274 New 200 2 b d 1 5/6 4
5.8 S02 7269 New 400 3 b 1 1 5/4 8 150 2 b ^ - 1
6.5 S 14 7262 (2) New (100) (1.5) 1 — d 1 5/1 1
6.7 S09 7278(2^) New 200 2.5 b — d 1 5/8 1
6.7 S08 7263 New 100 1 1 d 1 5/1 6
7.0 N04 7264 New 400 1.5 1 - d 1 5/1 7
7.8 S13 7275 (2) New 200 1.5 b - d 1 5/7 1
8.0 N24 7272 (2) New (100) (2) b - d 1 5/5 1
9.2 N39 7282 (2) New (100) (1.5) b ~ d 1 5/11 1
9.3 N17 7276 (4) New 200 1.5 b — d 1 5/7 3
10.8 S15 7270 New 300 1.5 1 d 1 5/4 8
11.1 N25 7273 7232 800 3 1 — 1 2 5/5 12
12 .2 N33 7280 (2) New (200) (2.5) b — d 1 5/10 1
12.2 S03 7283(2) New 200 2 b - d 1 5/11 1
12.4 N29 7284(2) New 200 1.5 b — d 1 5/11 1
13.2 S38 7290 (2) New (100) (1.5) b - 1 1 5/17 1
13 .5 NO 2 7287(6) New (300) (1.5) b d 1 5/15 2
14.2 Nil 7277 7222 400 1.5 1 — d 3 5/7 9
14.6 S44 7285 New 100 1.5 b - d 1 5/14 3
15.4 N13 7279 72 24 1000 3 1 — 1 5 5/9 13 20 4 b ' .d
16.0 S10 7281 New 100 1.5 1 d 1 5/10 5 16.6 N23 7292 (2) New 100 1.5 b — d 1 5/18 1
17.3 N29 7299(2) New (200) (1.5) b - d 1 5/21 1
17.5 S03 7293 New 100 1.5 b d 1 5/18 3 18.0 S02 7302 (2) New (100) (2) b — 1 1 5/22 1
18.2 N3 1 7296 New 200 1.5 b - d 1 5/19 3 19.5 N06 7286 New 800 3 1 1 1 5/14 12 70 6 b d 19.6 Sll 7303 New (200) (1.5) b d 1 5/22 2 19.8 S05 7291 New 100 1 b d 1 5/17 4 19.9 S09 7288(2) New (500) (1.5) b - d 1 5/15 1
20.0 S18 7289(2) New (300) (1) b — d 1 5/15 1 20.0 N48 7304(2) New (100) (1.5) b — d 1 5/22 1 (50) (2) b - d 21.0 S06 7312 (2) New (100) (1.5) b — d 1 5/24 1
21.2 N23 7311(2) New (200) (2) b - d 1 5/24 1
21.2 S20 7300 New 200 1.5 b d 1 5/21 2
COMMERCE STANDARDS BOULOER
CALCIUM PLAGE AND SUNSPOT REGIONS 11 b
MAY 1964
May
1964
LAT. MCMATH
PLAGE NUMBER
RETURN OF
REGION
CALCIUM PLAGE DATA SUNSPOT DATA CMP VALUES HISTORY AGE
(ROTA¬ TIONS)
DATE FIRST SEEN(i)
DURA¬ TION (DAY^)
CMP VALUES HISTORY AREA INT AREA COUNT
21.2 N29 7308(2) New (100) (1.5) b _ d i 5/23 1 21.3 N27 7294 (2) New (100) (1.5) b - d i 5/18 1
21.5 N05 7307 New (200) (2) b — d i 5/23 3 22.1 N20 7295 (2) New (100) (1.5) b — d i 5/18 1 22.1 Nil 7297 New 300 3.5 b 1 i 5/20 9 120 4 b - d
22.5 N68 7305 (2) New 100 1.5 b - d i 5/22 1
23.1 S10 7301 New 200 1.5 b — 1 i 5/21 6
23.3 N29 7315 (2) New (100) (1.5) b — d i 5/25 1
23.7 S44 7306 (2) New 400 1.5 b — d i 5/22 1
23.9 N41 7309 New 100 1.5 b - d i 5/23 2
25.5 S08 7317 New 200 1 b d i 5/27 3 26.0 N47 7318 (2) New 100 1.5 b - d i 5/27 1
26.5 NO 7 7298 New (500) (1) 1 - d i 5/20 3 27.0 S22 7325 New (300) (2) b d i 5/30 2 27.4 N32 7323(2) New (200) (1.5) b — d i 5/29 1
27.3 S50 7310 (2) New (400) (1) b — d i 5/23 1 27.6 N45 7321(2) New 200 1 b — d i 5/28 1
28.4 N14 7313 7255 300 1 1 — d 3 5/24 9 29.0 N18 7314(7) 7255 (200) (1) 1 d 3 5/24 2
29.3 S18 7326 New (100) (2) b — d 1 5/31 2
30.4 N16 7319 7256 600 1.5 1 — 1 3 5/24 13 30.6 S50 7322 (2) New (200) (1.5) b — d 1 5/28 1 31.3 S08 7320(2) New (200) (1.5) b - d 1 5/27 1 31.7 S27 7327(2) New 100 1.5 b — d 1 6/1 1 31.8 N28 7337(2) New (100) (1.5) b - d 1 6/4 1
COMMERCE - STANDARDS - BOULDER
(1) No calcium plage data were secured at the McMath-Hulbert Observatory on May 12 and 13, 1964.
(2) These very small and ephemeral plages last for only one day.
(3) New - Near position of 7216.
(4) New - In position of 7213.
(5) New - In position of 7263.
(6) New - In position of 7236.
(7) Part of 7255.
He MT. WILSON MAGNETIC CLASSIFICATIONS OF SUNSPOTS
MAY 1964
May 1964
TIME MEAS
UT
LAT MER
DIST
TYPE May 1964
TIME
MEAS UT
LAT MER
DIST TYPE
1-4 No Spots 19 2305 N07 W03 af
5-7 No Obs. 20-21 No Spots
8 2240 00 W50 ap* 22 2305 N12 W12 Pf
9 1755 00 W61 23 No Obs.
10-11 No Obs. 24 1555 N13 W35 Pf
12-13 No Spots 25-27 No Obs.
14 1605 N13 E10 P 28 2120 NO 5 E51 aP
15 1715 N14 W04 Pf 29 16 10 N05 E41 Pp
16 No Obs. 30 1445 NO 5 E28 aP
17 1740 N07 E27 P 31 1605 N05 E14 a?
18 2155 NO 7 E10 P
COMMERCE - STANDARDS - BOULDER
* As referred to Northern Hemisphere. Erratum: In CRPL-F 236B for April 1964 page lib, the sunspot reported by Mt. Wilson for March
17, 1964 should have been Nil E63 instead of Nil W63.
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3 I
INTERVALS OF NO FLARE PATROL OBSERVATIONS
MAY 1964
HOUR-UT
I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18 19 20 21 22 23 24
i
COMMERCE - STANDARDS BOULDER
Arcetri
Capri-S (Swedish)
Duns ink
Haute-Provence
Huancayo
Ikomasan
Istanbul
Lockheed
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02
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1445
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19
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00
50
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DA
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1964
vO vO co co OO' oo »h cm cm 44444 in in m m in in to vO r- Is- n- f- O' o rH co co co co OOO OO OO rHrH iH fH rH HHH HH HHHHHHH rH rH rH rH rH rH rH rH CM CM C\J f\J CM CM
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13
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1040
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12
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1437
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DA
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1964
m m ri m m -4-4«4-4 mmmiriin 43 -0 43 4) r- r-- r- r- r- I- coco 0 O' cm cm cm cm cm cm cm cm cm <\i <\j cm r\j cm cm cm cm cm cm cm cm cm cm cm cm cm cm cm
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SC
RIP
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NO
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MB
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1961
FO
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FIN
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N
OF
CO
RR
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D
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EA
VA
LU
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AM
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TO
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.
I
2
3
4
5
6
7
8
9
10
I I
I 2
13
14
I 5
I 6
I 7
I 8
19
20
2 I
22
23
24
25
26
27
28
29
INTERVALS OF NO FLARE PATROL OBSERVATIONS nij
KEItltl Ain 1961
HOUR-UT
I 2 3 4 5 6 7 8 9 10 I I 12 13 14 15 16 17 18 19 20 21 22 23 24
_
.Hil! 1
1
a
ITT! 1
bservatories included:
bastumani
rcetri
thenes
ucharest
apetown
apri-G (German)
Capri-S (Swedish)
Climax
Crimee
Duns ink
Haute-Provence
Herstmonceux
Huancayo
Ikomasan
Irkutsk
Istanbul
Kiev-KO
Kodaikanal
Locarno
Lockheed
Manila
M^Math-Hulbert
Mitaka
Nizamiah
Nizmir
Ondrejov
Ottawa
Sacramento Peak
Sydney
Tachkent
Thessaloniki
Ucc le
Voroshilov
Zurich
ink IONOSPHERIC EFFECTS OF SOLAR FLARES
SHORT WAVE RADIO FADEOUTS SUDDEN PHASE ANOMALIES SUDDEN COSMIC NOISE ABSORPTION SUDDEN ENHANCEMENTS OF SIGNAL
SUDDEN ENHANCEMENTS OF ATMOSPHERICS SUDDEN FREQUENCY DEVIATIONS SOLAR NOISE BURSTS AT 18 Mc/s
APRIL 1964
APR.
1964
UNIVERSAL TIME TYPE SWF IMP
IMPORTANCE
BUR
WIDE SPREAD INDEX
STATIONS KNOWN FLARE
START END MAX ABS SCNA SEA SPA SES SFD
1 3 1615 165 5 164S 5L 1 s HU BO FM MT
COMMERCE ■ STANDARDS BOULDER
RIOMETER EVENTS mi i
( Provisional)
APRIL 1964
South Pole 26 Mc/s
APR
1964
START
UT
ENO
UT
MAX.
UT
MAX,
ABSORP
db,
(tenths)
NO
OF
PEAKS
MAR.
1964
START
UT
END
UT
MAX
UT
MAX,
ABSORP
db,
(tenths)
NO
OF
PEAKS
1 * 16 0333 0417 0351 8 1
2 ** 16 1126 1634 1438 16 4
3 0048 2106 0531 49 9 17 VwW? 1034 0214 13 2
4 0309 2302 0318 91 4 18 1043 2031 1308 31 1
5 0054 0428 0100 102 1 19 0949 1938 1153 26 2
5 0712 0725 15 2 20 0125 1520 0226 61 4
6 0416 0502 0433 4 1 20 1649 1802 1720 6 1
6 1345 1756 1551 13 2 20 2250 0426 2310 19 2
6 2304 1751 2311 43 3 21 0956 1918 15 10 23 1
7 ** 22 **
8 0812 1649 1128 18 1 23 >wV
8 1927 2002 1937 4 1 24
9 0204 0419 0218 17 2 25 0131 0202 0136 7 1
9 0814 1737 1055 7 3 25 0837 1745 1346 8 1
10 0943 1653 1139 13 1 25 2318 2349 2320 9 1
11 1005 1702 1108 14 1 26 0054 1048 0304 10 3
12 ** 26 2323 1708 2353 87 3
13 >wV 27 /'wV
14 ** 28 0052 0112 86 2
15 1056 1817 1242 11 2 29 1740 0140 27 1
30 /'wV
COMMERCE - STANDARDS - BOULDER
* No Data ** No Event
*** Uncertain
IVa SOLAR RADIO EMISSION
OUTSTANDING OCCURRENCES
MAY I<M>1
ARO- OTTAWA 2800 Mc/s
MAY
U R DESCRIPTIVE START DURATION MEAN MAXIMUM
1964 A N E
TYPE UT HRS. MIN. FLUX TIME FLUX
REMARKS
None observed.
SO
LA
R
RA
DIO
EM
ISS
ION
IN
TE
RF
ER
OM
ET
RIC
OB
SE
RV
AT
ION
S
MA
Y 1
964
IVb
o CO
LD CM
O CM
LD
£ u UJ
MA
Y 1
964
IVc SOLAR RADIO EMISSION
OUTSTANDING OCCURRENCES
MAY 1964
NBS BOULDER 108 Me s
May 1964
TYPE START UT
TIME OF MAXIMUM
UT
DURATION MINUTES
INTENSITY
2 3 1529.8 1529.9 1.9 3
7 3 1429.9 1431.0 2.2 1
15 3 1615.8 1616.0 1.4 2
15 3 2004.8 2005.0 2.1 2
16 3 1259.0 1301.0 1.9 2
21 3 1146.5 1147.0 2.4 3
NOMINAL TIMES OF OBSERVATION
MAY 1964
NBS BOULDER 108 Mes
May 1964
HOURS OF OBSERVATION
U.T.
HOURS OF INTERFERENCE
U.T.
May 1964
HOURS OF OBSERVATION
U.T.
HOURS OF INTERFERENCE
U.T.
1 1205-0135 16 1149-0149 2 1204-0136 17 1148-0149 3 1203-0137 18 1147-0150 4 1202-0138 1201-1351; 19 1147-1910
1450-1902 20 1910-0152 5 1201-0139 1205-1700
21 1145-0153 6 1159-0140 22 1144-0154 7 1158-0141 23 1143-0154 8 1157-0142 24 1143-0155 9 1156-0143 25 1142-1829; 2341-2352
10 1155-0144 2058-0156
11 1154-0145 26 1141-0157 2000-2128 12 1153-0146 27 1141-0158 1847-1920; 13 1152-0146 2246-2320; 14 1151-0147 0130-0158 15 1150-0004; 28 1140-0158
0109-0148 29 1140-0158 1140-2140 30 1139-0159 31 1139-0159 0003-0027
COMMERCE STANDARDS BOULDER
SOLAR RADIO EMISSION SPECTRAL OBSERVATIONS
MAY 1961
High Altitude Observatory Boulder 7.6-41 Mc/s
Date Bursts May
1964 Type Time (U.T.) Inter- Frequency sity Range (Mc/s)
3 Hay III 1431-1431:30 1 18-34 7 III 1431-1432 1 l8-4l
COMMERCE - STANDARDS BOULDER
Erratum: 11 august 1963 evert at 2357:15-2417 is type II instead of continuum.
IVd
SO
LA
R
RA
DIO
EM
ISS
ION
SP
EC
TR
OH
EL
IO G
RA
MS
M
AY
1964
SO
LA
R
RA
DIO
EM
ISS
ION
SP
EC
TR
OH
EL
IO G
RA
MS
SO
LA
R
RA
DIO
EM
ISS
ION
SP
EC
TR
OH
EL
IO G
RA
MS
SO
LA
R
RA
DIO
EM
ISS
ION
SP
EC
TR
OH
EL
IO G
RA
MS
SO
LA
R
RA
DIO
EM
ISS
ION
SP
EC
TR
OH
EL
IO G
RA
MS
M
AY 1
96
4
IV,
SO
LA
R
RA
DIO
EM
ISS
ION
SP
EC
TR
OH
EL
IO G
RA
MS
!
e u IVj
Va COSMIC RAY INDICES
(Climax Neutron Monitor)
IGC Station B 305
APKIL 1964
Apr. 1964
DAILY
AVERAGE
COUNTS / HOUR*
Apr.
1964
DAILY
AVERAGE
COUNTS / HOUR*
1 3263.7** <40 16 3263.9 2 3293.1 17 3269.1 3 3283.4 18 3257.4 4 3280.7 19 3257.5 5 3289.0 20 3264.0** <40 6 3273.0 21 3262.5 7 3268.0 22 3269.5 8 3259.1 23 3273.4 9 3265.9 24 3267.9
10 3265.5 25 3270.8 11 3257.1 26 3275.4 12 3261.2 27 3276.9 13 3260.9 28 3258.1 14 3246.6 29 3262.8 15 3251.8 30 3268.9
COMMERCE - STANDARDS - BOULDER
* Scaling Factor 128 ** No. of Section Hours
CO
SM
IC
RA
Y
IND
ICE
S
Vb
CO
MM
ER
CE
- S
TA
ND
AR
DS
- B
OU
LD
ER
Via GEOMAGNETIC ACTIVITY INDICES
APRIL 1964
Apr. 1964
C Values Kp
Sura Ap Final
Selected Days
Three hour Gr. interval 1 2 3 4 5678
1 1.4 1- Oo 1- 1+ 3+ 6+ 6+ 7+ 26o 46 Five
2 1.3 5+ 4+ 3+ 3o 3- 4o 4+ 3+ 30+ 26 Quiet
3 1.1 4- 4+ 2+ 3+ 3+ 3+ 3- 3o 26o 18
4 0.6 4- 3o 3- 2- 2- 2o 1+ 3- 19- 11 12
5 0.6 2+ 3o 1+ 3- 1+ 2- 2+ 4o 19- 11 14 22
6 0.3 2+ 2o 1- lo 1- 1- 1+ 3o 12- 6 23
7 0.7 3o 2o 3o lo 2+ 2+ 3+ 2o 19o 10 24 8 0.8 3- 2o 3+ 4o 3o 2- 3+ 2+ 22+ 14
9 0.4 2+ 3+ 2- 2+ 2o 1+ 1- Oo 14- 7 10 0.2 1- 0+ 2- 3+ 1+ 0+ 0+ 1- 9- 5
11 0.7 Oo 1+ 2o 3o 5- 4- 3o 1+ 19o 14 Five 12 0.1 1- 1+ 1+ 0+ 0+ 1- 1- 2o 7+ 4 Disturbed
13 0.2 2- 2- lo 0+ 0+ 1+ 2- 2o lOo 5 14 0.1 2- 1- 0+ 2- 2o 1- 0+ 1- 80 4 1 15 0.6 lo 1- lo 3o 3o 2+ 1+ 3+ 16- 9 2
16 19
0.6 3+ 3- 2+ 1+ 3- 2+ 1+ 1+ 17+ 9 27 17 1.1 4o 4- 4o 3- 2+ 3o 2+ 2o 24o 16 28 18 1.1 0+ 1- 2o 4o 5o 5- 4- 3+ 24- 21 19 1.2 4o 3+ 2+ 5- 3+ 3+ 4- 4- 28+ 22 20 1.0 3o 2+ 4+ 2o 1+ 3- 3o 4o 22+ 15
21 0.6 4- 2- 1+ 2o 2- 1+ 2+ 2+ 16+ 9 Ten 22 0.0 0+ Oo 1- lo 0+ 0+ 1- 1- 4o 2 Quiet
23 0.0 1+ 1+ lo 0+ 0+ 0+ 1- lo 6+ 3 24 0.2 Oo 1- 0+ 2- 1- lo 1+ 1+ 7o 4 6 25 0.7 2- 1+ 2- 3+ 3+ 2o 3- 3+ 19+ 11 9
26 10
0.7 3- 4- 3o 2+ lo 2- 2o 2- 18 0 10 12 27 1.3 2+ 3- 3o 3o 3+ 5+ 5o 5- 29+ 26 13 28 1.4 5+ 5o 5o 5- 4- 2o 3+ 4o 33o 33 14 29 0.9 5o 3+ 2+ 2o 2+ 2o 4o lo 22o 16 15 30 0.8 1- 0+ 0+ 1- lo 3o 3+ 5- 14o 11 22
23 24
Mean: 0.69 Mean: 13
COMMERCE standards BOULDER
DA
YS
IN
SO
LA
R
RO
TA
TIO
N
INT
ER
VA
L
VIb
CO
MM
ER
CE
- S
TA
ND
AR
DS
Vila
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44444
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I + o I o I + O O I 44444 44444 44444
O O I + I 4 4 4 4 4
r^*-jOO 0*-*0r-i
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4 CM * (NJ OOOO
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CRPL RADIO PROPAGATION QUALITY FIGURES AND FORECASTS VII b
NORTH ATLANTIC
APRIL 1964 — Short-term forecast I Range of reports
o Quality figure
OUTCOME OF ADVANCE FORECASTS--FINAL ESTIMATES (I TO 7 DAYS AHEAD)
v.wm
sH «□
DISTURBED
—
NORTH PACIFIC
QUIET
ACTUAL
COMPARISON (SEE TEXT)
P
S
u
F
a m □
0 COMMERCE STANDARDS BOULDER
Vile USEFUL FREQUENCY RANGES - NORTH ATLANTIC PATH
APRIL 1964
tfuT 3 6 9 12 15 18 21 24
COMMERCE STANDARDS BOULDER
USEFUL FREQUENCY RANGES ~ NORTH ATLANTIC PATH Vlld
APRIL 1961
OhUT 3 6 9 12 15 18 21 24 C^UT 3 6 9 12 15 18 21 24
Adapted from Observations by Deutsches Bundespost
Villa IQSY ALERT PERIODS
INTERNATIONAL URSIGRAM AND WORLD DAYS SERVICE
MAY 1964
MAY
1964
TIME
OF ISSUE
UT
ADVANCE GEOPHYSICAL ALERT
WORLDWIDE GEOPHYSICAL ALERT
NO. TYPE TIMING ELABORATION
1 0400 65 Solar Calm Exists
2 0400 66 Solar Calm Exists
3 0400 67 Solar Calm Exists
9 0400 68 Magnetic Calm Exists
15 0400 69 Magnetic Storm Exists
15 1250 Ft. Belvoir, Magnetic Storm
13/12XXZ
16 0400 70 Magnetic Storm Exists
20 1810 Climax, Solar Flare 20/13302
24 0400 71 Magnetic Storm Expected
25 0400 72 Magnetic Storm Expected
CCMC ST*NO**06 ■ KJULOt*