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From: oler@rho.uleth.ca (Cary Oler)
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Subject: Daily Summary of Ionospheric Data for 21 May
To: solar-daily@lut.fi
Date: Sat, 22 May 93 11:41:24 MDT
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                    ---------------------------------------
                    DAILY IONOSPHERIC SUMMARY FOR 21 MAY 93
                    ---------------------------------------


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

     SAL  TOM  DIX  MAG  MUR  ASH  KHA
     ---  ---  ---  ---  ---  ---  ---
00Z: 3.0  3.3  2.8
01Z:
02Z: 3.0  3.1                 2.8  3.2
03Z: 2.9
04Z:
05Z: 3.1  3.1                      2.7
06Z: 3.0  3.2            2.9  2.9  2.9
07Z: 3.0  3.2            3.0
08Z: 3.0  3.1       3.0            3.1
09Z: 3.0  3.2  2.8  3.0       2.7
10Z: 3.1  3.1  2.9       2.9  2.9  3.0
11Z:      3.2  3.0  3.0  3.0
12Z: 3.2  3.1  3.1  3.1
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

     SAL  TOM  DIX  MAG  MUR  ASH  KHA
     ---  ---  ---  ---  ---  ---  ---
00Z: 1.0  1.2  1.0  1.0
01Z:                               1.2
02Z: 1.0  1.0  1.0  1.0       2.0  1.1
03Z: 1.0       1.0  1.0            1.2
04Z:
05Z: 1.0  1.0  1.0  1.0            1.1
06Z: 1.0  1.7  1.0  1.0  1.0  2.0  1.4
07Z: 1.0  1.5  1.0  1.0  2.0       1.3
08Z: 1.0  1.3       1.0            1.4
09Z: 1.0  1.3  1.0  1.0       2.0
10Z: 1.0  1.3  1.0       1.5  2.0  1.2
11Z:      1.3  1.3  1.0  1.3
12Z: 1.0  1.2  1.0  1.0
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

     SAL  TOM  DIX  MAG  MUR  ASH  KHA
     ---  ---  ---  ---  ---  ---  ---
00Z: 2.4            3.4
01Z:                               8.2
02Z:      5.0       4.2       2.5  5.9
03Z: 4.0            4.5            7.0
04Z:
05Z: 4.2  3.5  3.2  4.7            4.1
06Z: 4.0  3.5  4.2  3.8       3.7  4.0
07Z: 4.0  3.5  4.4  3.0  3.5       7.5
08Z: 4.2            2.5            4.5
09Z: 3.4            1.5
10Z: 3.1                           3.9
11Z:                1.4
12Z:      3.0       1.1
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

      SAL  TOM  DIX  MAG  MUR  ASH  KHA  OTI
     ---- ---- ---- ---- ---- ---- ---- ----
00Z:  5.0  5.5  5.0  4.9
01Z:
02Z:  5.7  6.4  5.2  4.6       5.1  5.7
03Z:  5.6       5.0  4.8
04Z:
05Z:  5.9  6.8       4.8            5.7
06Z:  5.5  6.8  5.2  4.8  6.1  9.1  5.7
07Z:  6.0  6.4  5.0  4.6  6.1
08Z:  6.0  6.5       4.8            6.0
09Z:  6.0  6.5  5.5  5.1       8.1
10Z:  6.0  6.3  5.6       6.0  8.0  6.4
11Z:       6.4  5.5  6.2  6.1
12Z:  5.7  6.3  5.4  6.5                 5.0
13Z:                                     5.2
14Z:                                     5.3
15Z:
16Z:                                     5.5
17Z:                                     5.6
18Z:                                     5.5
19Z:
20Z:
21Z:
22Z:
23Z:


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

      SAL  TOM  DIX  MAG  MUR  ASH  KHA
     ---- ---- ---- ---- ---- ---- ----
00Z: 15.0 18.1 14.0
01Z:
02Z: 17.1 19.8                14.3 18.2
03Z: 16.2
04Z:
05Z: 18.3 21.1                     15.4
06Z: 16.5 21.8           17.7 26.4 16.5
07Z: 18.0 20.5           18.3
08Z: 18.0 20.1      14.4           18.6
09Z: 18.0 20.8 15.4 15.3      21.9
10Z: 18.6 19.5 16.2      17.4 23.2 19.2
11Z:      20.5 16.5 18.6 18.3
12Z: 18.2 19.5 16.7 20.1
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

      PAL  SHE  OSA  TAO  CNV  BOU  ANC
     ---- ---- ---- ---- ---- ---- ----
00Z:  470            180       230  210
01Z:       230       210       230
02Z:  510  150       240       240  190
03Z:  530  150       290  160  210  180
04Z:  510  160       320  150  190  180
05Z:  450  240       350  140  170  170
06Z:  280  210       400  150  160  170
07Z:  210  160       410  150  150  170
08Z:  180  160       370  140       160
09Z:  160  150       330  130  150  150
10Z:  150  150       280  120  160  150
11Z:  140  160       210  130  160  140
12Z:   90  170       160  170  170  140
13Z:   93  170       140  210  210  140
14Z:   81  160       150       290  140
15Z:   77  160       170  280  320  170
16Z:   85  160       150  300  330  200
17Z:  140  130       120  330  330  220
18Z:  180  190       100  330       250
19Z:  230  230        87  340  310  290
20Z:  280  230        54  320  310  290
21Z:  330  230        65  300  300  280
22Z:                           290  290
23Z:


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

SAL = Salekhard                  USSR                (N66E066)
TOM = Tomsk                      USSR                (N56E085)
DIX = Dixon                      USSR                (N74E081)
MAG = Magadan                    USSR                (N60E151)
MUR = Murmansk                   USSR                (N68E033)
ASH = Ashkhabad                  USSR                (N37E058)
KHA = Khabarovsk                 USSR                (N48E135)
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.


