<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-17 -076 19:40:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.03.17 (076) 19:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202607603171940009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.603" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.850" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.921" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.447" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="362.168" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="268.922" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.694" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="126.035" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.720" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="67.062" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="148.200" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.430" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="155">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 220.000 222.500 225.000 230.000 230.000 230.000 230.000 230.000 240.000 240.000 241.667 243.333 245.000 246.667 248.333 250.000 251.667 253.333 255.000 256.667 258.333 260.000 261.667 263.333 265.000 270.000 270.000 270.000 271.667 273.333 275.000 275.000 275.000 275.000 278.333 281.667 285.000 285.000 285.000 287.500 290.000 292.500 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 305.000 305.000 305.000 305.000 310.000 310.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 325.000 325.000 330.000 330.000 332.500 335.000 335.000 335.000 340.000 341.250 342.500 343.750 345.000 345.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 402.500 405.000 405.000 405.000 406.250 407.500 408.750 410.000 410.000 412.414 414.828 417.241 419.655 422.069 424.483 426.897 429.310 431.724 434.138 436.552 438.966 441.379 443.793 446.207 448.621 451.034 453.448 455.862 458.276 460.690 463.103 465.517 467.931 470.345 472.759 475.172 477.586 480.000 482.500 485.921 489.751 494.069 498.974 504.594 511.098 518.713 527.748 538.645 552.041 568.911 590.805
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 51 48 0 0 0 48 54 57 0 0 0 57 0 0 51 0 48 0 0 0 48 0 57 0 60 60 0 0 60 0 57 51 48 0 54 57 60 0 57 0 45 51 0 60 63 51 60 57 63 57 0 63 63 60 63 51 60 63 0 57 63 63 57 63 54 60 0 54 60 63 57 0 54 0 66 66 63 66 60 66 57 63 66 63 66 60 66 57 63 54 63 66 69 66 57 66 57 66 69 63 69 60 69 69 69 0 54 0 69 69 0 69 69 72 63 0 72 69 69 0 0 0 66 54 63 51 63 54 63 54 0 57 63 60 63 63 60 60 60 60 0 0 45 42 0 0 48 51 51 48 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 -2.734375 -0.390625 2.734375 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -1.953125 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.651 90.0 95.0 100.0 105.0 110.0 115.0 115.847 120.0 121.695 125.0 127.542 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 362.168 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.229 1.643 2.119 2.368 2.447 2.356 2.322 2.322 2.322 2.393 2.447 2.506 2.627 2.75 2.875 3.005 3.141 3.282 3.429 3.584 3.746 3.915 4.092 4.277 4.468 4.666 4.868 5.075 5.285 5.497 5.711 5.925 6.139 6.353 6.566 6.777 6.988 7.197 7.404 7.61 7.815 8.019 8.221 8.422 8.622 8.82 9.017 9.213 9.406 9.596 9.783 9.964 10.137 10.299 10.443 10.564 10.651 10.695 10.7 10.698 10.686 10.663 10.63 10.588 10.536 10.476 10.407 10.332 10.249 10.16 10.065 9.965 9.86 9.75 9.636 9.518 9.397 9.274 9.147 9.019 8.888 8.756 8.623 8.489 8.353 8.218 8.082 7.945 7.809 7.673 7.538 7.403 7.268 7.135 7.002 6.871 6.74 6.611 6.484 6.357 6.232 6.109 5.987 5.866 5.747 5.63 5.515 5.401 5.29 5.179 5.071 4.965 4.86 4.757 4.655 4.556 4.458 4.363 4.268 4.176 4.085 3.996 3.909 3.824 3.74 3.658 3.577 3.498 3.421 3.345 3.271 3.198 3.127 3.057 2.989 2.922 2.856 2.792 2.73 2.668 2.608 2.549 2.492 2.436 2.381 2.327 2.274 2.223 2.172 2.123 2.075 2.028 1.981 1.936 1.892 1.849 1.807 1.766 1.726 1.686 1.648 1.61 1.573 1.537 1.502 1.468 1.434 1.401 1.369 1.338 1.307 1.277 1.248 1.22 1.192 1.164 1.138 1.112 1.086 1.061 1.037 1.013 0.99 0.967 0.945 0.923 0.902

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.447" PeakHeight="110.0" Num="3" Error="0.0">
-29.655 11.927 -2.621
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.447" EndFrequency="10.7" PeakHeight="362.168" Num="5" zHalfNm="268.922" Error="2.466">
-199.593 -45.648 16.566 -8.328 2.377
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="17.542" Depth="0.125"/>
<TopsideChapman PeakHeight="362.168" PeakDensity="1420471.5" PeakScaleHeight="67.062" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
