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From: oler@rho.uleth.ca (Cary Oler)
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Subject: Daily Summary of Ionospheric Data for 13 May
To: solar-daily@lut.fi
Date: Thu, 13 May 93 21:12:20 MDT
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                    ---------------------------------------
                    DAILY IONOSPHERIC SUMMARY FOR 13 MAY 93
                    ---------------------------------------


REPORTS OF IONOSPHERIC ABSORPTION
---------------------------------

ARC: Type of Measurement = Riometer.
     Type of Phenomenon  = Auroral Absorption.
     Start of Event: Unspecified or In Progress at start of reporting period.
     Event Maximum : 0150Z,  Maximum Absorption: 1 dB
     End of Event  : 0400Z


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

     ASH  SAL  TOM  KHA  MAG  UPS
     ---  ---  ---  ---  ---  ---
00Z: 2.8  2.9  3.2  2.6
01Z: 2.9  2.4  3.5  2.5       2.8
02Z: 2.9                      2.7
03Z: 3.0                      3.0
04Z: 3.1            2.6
05Z: 2.4       2.6  2.9       2.4
06Z:      2.4            2.8
07Z: 2.8  2.6            3.0
08Z: 2.9  2.6  2.9       3.0
09Z:      2.8  3.1       3.0
10Z: 2.8  2.8  3.3  2.9  3.0
11Z: 2.8  2.6  3.1  3.0  2.8
12Z:      2.8       2.8  2.9
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

     MUR  ASH  SAL  TOM  DIX  KHA  MAG
     ---  ---  ---  ---  ---  ---  ---
00Z:      2.0  1.0  1.3       1.0
01Z:      2.0  2.9  1.2       1.3  1.0
02Z:      2.0       1.6       1.3  1.0
03Z:      2.0       1.4       1.4  1.0
04Z: 2.2  2.0  1.0  2.0       1.5  1.0
05Z: 1.0  2.0       1.5  1.8  1.3
06Z: 1.5       1.0       1.8       1.0
07Z: 1.5  2.0  1.0  2.0            1.0
08Z: 1.0  2.0  3.3  1.4  1.2  1.1  1.0
09Z: 1.5  2.0  3.2  1.7  3.0  1.3  1.0
10Z: 1.2  2.0  3.0  1.0  1.8  1.1  1.0
11Z:      2.0  2.9  1.0       1.1  1.0
12Z:           2.0            1.3  1.0
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

     ASH  SAL  TOM  DIX  KHA  MAG
     ---  ---  ---  ---  ---  ---
00Z:           2.2
01Z:                     4.0
02Z: 3.3                 4.7
03Z: 2.9                 4.0  3.4
04Z: 3.5                 3.7
05Z: 4.8            3.3  4.0
06Z:                3.2       2.4
07Z: 4.8                      2.0
08Z: 6.2       3.7       6.0  2.5
09Z: 4.1                 7.4
10Z: 3.8  4.0            6.0  1.6
11Z:                     1.9  1.5
12Z:      3.0                 2.0
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

      MUR  ASH  SAL  TOM  DIX  KHA  MAG  UPS  POI  OTI
     ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
00Z:       6.0  4.8  3.8       4.9       3.8  5.7
01Z:       6.8  4.2  4.0       5.1       4.0  5.2
02Z:       6.0                           3.5  4.7
03Z:       5.6                      4.6  3.6  4.3
04Z:       5.4                 5.3  4.7  3.5  3.7
05Z:       6.1       5.3  4.8  5.7       4.1  4.2
06Z:  4.3       4.8       5.0       4.9       4.7
07Z:  4.6  6.0  4.9                 5.1       4.8
08Z:  4.8  6.5  5.0  5.4  5.0       5.0
09Z:       6.4  5.0  5.7  5.0       5.1
10Z:       6.8  5.0  5.4  5.0  5.8  5.2
11Z:       7.4  5.1  5.4       6.2  5.5
12Z:            5.0            6.2  5.6            4.5
13Z:                                               4.8
14Z:                                               4.8
15Z:                                               4.9
16Z:                                               5.2
17Z:                                               5.1
18Z:                                               5.4
19Z:
20Z:
21Z:
22Z:
23Z:


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

      ASH  SAL  TOM  KHA  MAG  UPS
     ---- ---- ---- ---- ---- ----
00Z: 16.8 13.9 12.2 12.7
01Z: 19.7 10.1 14.0 12.8      11.2
02Z: 17.4                      9.4
03Z: 16.8                     10.6
04Z: 16.7           13.8
05Z: 14.6      13.8 16.5       9.8
06Z:      11.5           13.7
07Z: 16.8 12.7           15.3
08Z: 18.9 13.0 15.7      15.0
09Z:      14.0 17.7      15.3
10Z: 19.0 14.0 17.8 16.8 15.6
11Z: 20.7 13.3 16.7 18.6 15.4
12Z:      14.0      17.4 16.2
13Z:
14Z:
15Z:
16Z:
17Z:
18Z:
19Z:
20Z:
21Z:
22Z:
23Z:


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

      PAL  SHE  OSA  TAO  CNV  BOU  ANC
     ---- ---- ---- ---- ---- ---- ----
00Z:  480  250       200       340  130
01Z:  510            240  370       120
02Z:  510            270  270  290  100
03Z:  450            350  200  240   98
04Z:  360            440  200  190   89
05Z:  330            460  190  170   79
06Z:  270            410  190  160   80
07Z:  200  230       440  190  160   59
08Z:  150  110       490  160  160   42
09Z:  140  110       460  140        22
10Z:  120  150       370  130  150  6.3
11Z:  110   61       310  140  150   34
12Z:  120   66       250  190  160   29
13Z:  110   77            230  200   26
14Z:   90   70            260  240   40
15Z:   84   74            280  280   73
16Z:   95   73            300  290  130
17Z:  170                 330  310  190
18Z:  250                 380  320  230
19Z:  280                 400  310  240
20Z:  330                 400       220
21Z:  360                 370  320  210
22Z:  400                 370  310  180
23Z:  450                 390  290  170


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

MUR = Murmansk                   USSR                (N68E033)
ASH = Ashkhabad                  USSR                (N37E058)
SAL = Salekhard                  USSR                (N66E066)
TOM = Tomsk                      USSR                (N56E085)
DIX = Dixon                      USSR                (N74E081)
KHA = Khabarovsk                 USSR                (N48E135)
ARC = Archangelsk                USSR                (N64E040)
MAG = Magadan                    USSR                (N60E151)
UPS = Uppsala                    Sweden              (N60E018)
POI = Poitiers                   France              (N46E000)
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.


