<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 12:10:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</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" >
2026.02.27 (058) 12:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605802271210009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="11.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.749" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.374" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="215.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="447.469" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.043" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.195" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="334.175" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="247.114" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.086" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="115.416" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.500" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.935" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="144.940" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.330" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="138">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.75 10.8 10.85 10.9 10.95 11.0 11.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 217.143 219.286 221.429 223.571 225.714 227.857 230.000 235.000 240.000 245.000 247.500 250.000 255.000 257.500 260.000 262.500 265.000 267.500 270.000 273.750 277.500 281.250 285.000 285.000 285.000 285.000 286.667 288.333 290.000 295.000 295.000 295.000 295.000 295.833 296.667 297.500 298.333 299.167 300.000 305.000 306.250 307.500 308.750 310.000 310.000 310.000 310.000 310.000 312.000 314.000 316.000 318.000 320.000 320.000 320.000 320.000 330.000 330.000 331.111 332.222 333.333 334.444 335.556 336.667 337.778 338.889 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 382.500 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 427.500 430.000 435.000 435.000 435.000 435.000 435.000 436.667 439.929 443.513 447.469 451.859 456.759 462.261 468.485 475.583 483.752 493.255 504.448 517.826 534.096 554.312
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 45 0 51 0 0 48 51 48 48 0 54 54 0 54 0 48 0 57 0 0 0 48 0 54 48 0 0 0 0 0 0 54 0 0 0 51 0 51 57 0 0 0 57 60 60 54 45 0 0 0 0 63 63 60 57 48 0 0 0 0 0 0 0 51 0 60 66 63 63 69 72 66 66 69 66 69 69 66 69 72 69 57 63 69 60 63 51 57 63 54 66 69 66 69 66 66 66 66 66 69 66 66 66 60 60 63 63 63 54 60 60 54 57 63 54 57 54 57 51 54 45 0 0 0 0 0 0 0 0 0 42 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 2.734375 -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 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 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 1.953125 0.390625 -1.171875 2.734375 1.171875 1.171875 1.953125 2.734375 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" >
89.538 90.0 95.0 100.0 105.0 110.0 113.028 115.0 116.055 119.083 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 334.175 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.046 2.634 2.944 3.043 2.921 2.921 2.921 3.043 3.071 3.221 3.372 3.525 3.68 3.839 4.0 4.165 4.334 4.506 4.682 4.862 5.046 5.233 5.424 5.619 5.817 6.017 6.221 6.428 6.638 6.85 7.064 7.281 7.499 7.72 7.942 8.166 8.39 8.616 8.842 9.069 9.294 9.519 9.74 9.957 10.167 10.368 10.555 10.722 10.862 10.969 11.033 11.05 11.05 11.041 11.02 10.987 10.943 10.889 10.825 10.752 10.67 10.58 10.483 10.38 10.27 10.155 10.035 9.91 9.781 9.649 9.514 9.376 9.235 9.093 8.949 8.804 8.657 8.51 8.363 8.215 8.068 7.921 7.774 7.628 7.482 7.338 7.195 7.053 6.912 6.772 6.635 6.498 6.364 6.231 6.1 5.971 5.844 5.718 5.595 5.473 5.354 5.237 5.121 5.008 4.897 4.787 4.68 4.575 4.471 4.37 4.271 4.174 4.078 3.985 3.893 3.804 3.716 3.63 3.546 3.463 3.383 3.304 3.227 3.151 3.077 3.005 2.935 2.866 2.798 2.732 2.668 2.605 2.543 2.483 2.424 2.366 2.31 2.255 2.202 2.149 2.098 2.048 1.999 1.952 1.905 1.86 1.815 1.772 1.729 1.688 1.648 1.608 1.57 1.532 1.495 1.459 1.424 1.39 1.357 1.324 1.292 1.261 1.231 1.201 1.173 1.144 1.117 1.09 1.064 1.038 1.013 0.989 0.965 0.942 0.919 0.897 0.875 0.854 0.834 0.814 0.794 0.775 0.756 0.738 0.72 0.703

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.043" PeakHeight="110.0" Num="3" Error="0.0">
-30.231 12.755 -2.986
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.043" EndFrequency="11.05" PeakHeight="334.175" Num="5" zHalfNm="247.114" Error="2.849">
-179.547 -45.149 11.475 -2.508 0.637
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.083" Depth="0.122"/>
<TopsideChapman PeakHeight="334.175" PeakDensity="1514919.4" PeakScaleHeight="63.935" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
