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From: oler@rho.uleth.ca (Cary Oler)
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Subject: Daily Summary of Ionospheric Data for 18 May
To: solar-daily@lut.fi
Date: Wed, 19 May 93 10:30:15 MDT
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                    ---------------------------------------
                    DAILY IONOSPHERIC SUMMARY FOR 18 MAY 93
                    ---------------------------------------


M-FACTORS FOR 3000 KM DISTANCES - M(3000)F2
-------------------------------------------

     SAL  TOM  DIX  KHA  MAG  ASH  UPS
     ---  ---  ---  ---  ---  ---  ---
00Z: 3.1  3.0  2.6  3.1  2.8  2.5
01Z: 3.0  3.0       2.8  3.1  2.7
02Z: 2.7  3.1       3.0  3.0  3.0  2.8
03Z: 3.0  3.1            3.0  2.9
04Z: 2.9                 3.0  2.9  2.8
05Z: 3.1  .30  2.8       3.2  2.7
06Z: 3.1       2.9  3.1  3.0
07Z: 3.0                      2.8
08Z: 2.9                      2.7
09Z: 2.9                      2.7
10Z:                          2.8
11Z:
12Z: 1.2
13Z: 1.2
14Z: 1.2
15Z: 1.2
16Z: 1.2
17Z: 1.2
18Z:
19Z:
20Z: 1.0
21Z: 1.0
22Z: 1.0
23Z: 1.0


MINIMUM OBSERVED FREQUENCIES - FMIN (MHz)
-----------------------------------------

     SAL  TOM  DIX  KHA  MAG  ASH
     ---  ---  ---  ---  ---  ---
00Z: 1.0  1.0  3.0  1.2  1.0  2.0
01Z: 1.0  1.0       1.3  1.0  2.0
02Z: 1.0  1.0       1.2  1.0  2.0
03Z: 1.0  1.2  1.4       1.0  2.0
04Z: 1.0       3.0       1.0  2.0
05Z: 1.0  .50  1.2       1.0  2.0
06Z: 1.0       1.2  1.1  1.0
07Z: 1.0                      2.0
08Z: 1.0                      2.0
09Z:                          2.0
10Z: 1.8                      2.0
11Z: 2.8
12Z: 2.9
13Z: 2.9
14Z: 3.1
15Z: 3.1
16Z: 3.1
17Z:
18Z: 1.8
19Z: 3.2
20Z: 3.2
21Z: 3.2
22Z: 3.0
23Z: 3.0


CRITICAL SPORADIC E-LAYER FREQUENCIES - Es (MHz)
------------------------------------------------

     SAL  TOM  KHA  MAG  ASH
     ---  ---  ---  ---  ---
00Z:      2.7  5.6  3.5
01Z:      3.0  4.0  4.2
02Z:      3.1  4.0  3.6
03Z:      3.2            3.0
04Z:                3.2  3.5
05Z:      4.3       3.1  3.7
06Z:
07Z:                     3.6
08Z:
09Z:                     3.8
10Z:  30
11Z:  36
12Z:  46
13Z:  46
14Z:  56
15Z:  56
16Z:  66
17Z:
18Z:  30
19Z:  36
20Z:  46
21Z:  46
22Z:  57
23Z:  58


OBSERVED CRITICAL F2 LAYER FREQUENCIES (MHz)
--------------------------------------------

      SAL  TOM  DIX  KHA  MAG  ASH  UPS  OTI
     ---- ---- ---- ---- ---- ---- ---- ----
00Z:  4.8  6.0  4.8  6.6  5.5  5.3
01Z:  4.8  7.0       6.4  5.6  5.3  3.7
02Z:  4.8  7.3       6.5  5.2  7.2  3.6
03Z:  5.2  7.0  5.0       5.6  7.5
04Z:  6.1       5.2       5.3  7.6  4.4
05Z:  6.3  7.3  6.0       5.2  7.8  4.8
06Z:  6.7       6.0  6.9  5.3
07Z:  6.7                      9.1
08Z:  6.9                      9.8
09Z:  6.9                      8.5
10Z:  8.7                      8.3
11Z: 10.7
12Z:                                     5.2
13Z:                                     6.0
14Z:                                     6.0
15Z:                                     6.0
16Z:                                     6.0
17Z:                                     6.1
18Z:  5.6                                6.0
19Z:
20Z:  2.7
21Z:  2.6
22Z:  2.7
23Z:  1.8


MAXIMUM USABLE FREQUENCIES FOR 3000 KM PATHS (MHz) - MUF(3000)
--------------------------------------------------------------

      SAL  TOM  DIX  KHA  MAG  ASH  UPS
     ---- ---- ---- ---- ---- ---- ----
00Z: 14.9 18.0 12.5 20.5 15.4 13.2
01Z: 14.4 21.0      17.9 17.4 14.3
02Z: 13.0 22.6      19.5 15.6 21.6 10.3
03Z: 15.6 21.7           16.8 21.8
04Z: 17.7                15.9 22.0 12.1
05Z: 19.5  2.2 16.8      16.6 21.1
06Z: 20.8      17.4 21.4 15.9
07Z: 20.1                     25.5
08Z: 20.0                     26.5
09Z: 20.0                     23.0
10Z:                          23.2
11Z:
12Z:
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


OBSERVED TOTAL IONOSPHERIC ELECTRON CONTENT
-------------------------------------------

      PAL  SHE  OSA  TAO  CNV  BOU  ANC
     ---- ---- ---- ---- ---- ---- ----
00Z:  490   98       270       250  120
01Z:  520  110       310  300  250   99
02Z:  520  170       320  240        94
03Z:  440  110       380  170  230   91
04Z:  380  190       490  150  210   77
05Z:  370  110       610  150  180   78
06Z:  300  200       710  150  170   79
07Z:  220  200       620  150  170   82
08Z:  160            600  150  160   77
09Z:  120  190       540  130  170   58
10Z:  110  110       520  120  170   41
11Z:  100  140       420  120  170   28
12Z:   88   59       320  170  180   25
13Z:   60   61       240  210  230   30
14Z:   78   55       190  250  280   44
15Z:   72   59       190  250  340   75
16Z:   77  120       220  290  370  150
17Z:  110   94       190  330  360  210
18Z:  160            210  360  370  240
19Z:  200            170  380  360  240
20Z:                 170       340  210
21Z:  300  180       190  370       180
22Z:  350            180  360  320  170
23Z:  400            150  350  310  170


LIST OF REPORTING STATIONS AND THE SATELLITES THEY USE TO MEASURE TEC:

SAL = Salekhard                  USSR                (N66E066)
TOM = Tomsk                      USSR                (N56E085)
DIX = Dixon                      USSR                (N74E081)
KHA = Khabarovsk                 USSR                (N48E135)
MAG = Magadan                    USSR                (N60E151)
ASH = Ashkhabad                  USSR                (N37E058)
UPS = Uppsala                    Sweden              (N60E018)
OTI = Ottawa                     Canada              (N45W076)
PAL = Palehua HI                 USA                 (N21W158)
SHE = Shemya AK                  USA                 (N52E174)
OSA = Osan AB                    Korea               (N37E127)
TAO = Taoyuan                    Taiwan              (N25E121)
CNV = Cape Canaveral FL          USA                 (N28W080)
BOU = Boulder CO                 USA                 (N40W105)
ANC = Anchorage AK               USA                 (N61W150)


DESCRIPTIVE CODES WHICH MAY APPEAR IN THE FOF2, M(3000), OR SID SECTIONS:

            A = Blanketing Sporadic E
            B = Complete Absorption
            C = Equipment Problems
            D = Frequency Higher than Equipment
            E = Frequency Lower than Equipment
            F = Spread Echoes
            G = FOF2 is less than FOF1
            I = Smoothed Value
            R = Attenuation


     Values in this experimental daily report have not been checked
     for errors and may occasionally contain a few.  Total electron
     content values are given in units of 10^15 electrons per square meter.


