<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 20:50:00.000"
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: 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" >
2026.04.04 (094) 20:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609404042050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="12.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.807" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="34.662" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.600" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="440.000" 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="1.346" 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="/" />
<URSI ID="92" Val="347.271" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="288.040" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.571" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.050" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="86.006" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="36.666" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="43.864" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="99.840" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.280" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="164">
<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 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 286.667 288.333 290.000 290.000 290.000 295.000 295.000 295.833 296.667 297.500 298.333 299.167 300.000 300.000 295.000 295.000 298.333 301.667 305.000 300.000 305.000 306.667 308.333 310.000 310.000 305.000 306.667 308.333 310.000 310.000 311.111 312.222 313.333 314.444 315.556 316.667 317.778 318.889 320.000 325.000 325.000 325.000 325.000 327.500 330.000 330.000 330.000 330.000 330.000 330.000 331.429 332.857 334.286 335.714 337.143 338.571 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 347.500 350.000 350.000 352.500 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 376.000 377.000 378.000 379.000 380.000 380.000 380.000 380.000 380.000 383.333 386.667 390.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 397.500 400.000 400.000 400.000 400.000 395.000 397.500 400.000 405.000 405.000 405.000 406.667 408.333 410.000 410.000 412.500 415.000 420.000 420.000 420.000 420.000 425.000 428.333 431.667 435.000 438.333 441.667 445.000 440.000 445.000 450.000 455.000 459.980 465.520 471.718 478.701 486.626 495.698
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 69 72 69 69 69 0 69 69 0 72 69 0 0 75 75 75 66 69 0 0 0 0 0 69 72 0 0 0 0 69 72 75 0 0 63 69 0 0 0 75 0 0 0 75 0 0 66 0 0 75 63 0 69 72 0 57 63 66 0 72 72 0 0 69 0 75 0 63 69 0 72 60 0 66 72 0 72 75 75 0 72 75 0 63 69 72 0 72 66 0 69 75 60 0 66 72 0 69 75 72 0 72 72 57 72 69 0 0 0 0 63 69 0 66 66 0 45 51 0 0 60 60 0 60 57 0 45 0 54 57 45 0 54 57 54 0 0 48 54 48 51 51 54 0 48 45 48 0 0 0 0 0 54 57 0 57 54 45 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 1.171875 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 1.171875 -1.171875 2.734375 -2.734375 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 0.390625 0.390625 2.734375 -1.171875 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="32">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 110.000 109.167 108.333 107.500 106.667 105.833 105.000 105.000 110.000 110.000 110.417 110.833 111.250 111.667 112.083 112.500 112.917 113.333 113.750 114.167 114.583 115.000 115.000 116.250 117.500 118.750 120.000 120.000 105.000 105.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 0 0 0 0 0 57 57 66 66 0 54 0 0 0 0 0 0 54 0 0 0 51 0 0 0 51 51 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 -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 2.734375 -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="186">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.012 95.0 100.0 105.0 110.0 115.0 120.0 122.469 125.0 130.0 134.937 135.0 140.0 145.0 147.406 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 347.271 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.899 1.166 1.303 1.346 1.322 1.248 1.191 1.191 1.191 1.191 1.192 1.254 1.316 1.346 1.456 1.648 1.833 2.016 2.203 2.395 2.593 2.797 3.009 3.229 3.457 3.692 3.936 4.188 4.447 4.715 4.991 5.274 5.564 5.863 6.169 6.482 6.803 7.131 7.466 7.808 8.157 8.513 8.875 9.243 9.616 9.991 10.367 10.74 11.104 11.451 11.768 12.036 12.234 12.338 12.35 12.345 12.314 12.255 12.17 12.062 11.933 11.785 11.621 11.442 11.25 11.047 10.834 10.614 10.388 10.157 9.922 9.684 9.444 9.204 8.964 8.724 8.486 8.25 8.016 7.786 7.558 7.335 7.115 6.899 6.688 6.481 6.278 6.081 5.888 5.7 5.516 5.338 5.164 4.995 4.831 4.672 4.517 4.367 4.221 4.079 3.942 3.809 3.681 3.556 3.435 3.318 3.205 3.096 2.99 2.887 2.788 2.693 2.6 2.51 2.424 2.34 2.259 2.181 2.106 2.033 1.962 1.894 1.829 1.765 1.704 1.644 1.587 1.532 1.479 1.427 1.378 1.33 1.283 1.238 1.195 1.154 1.113 1.075 1.037 1.001 0.966 0.932 0.9 0.868 0.838 0.809 0.78 0.753 0.727 0.701 0.677 0.653 0.63 0.608 0.587 0.566 0.547 0.528 0.509 0.491 0.474 0.458 0.442 0.426 0.411 0.397 0.383 0.37 0.357 0.344 0.332 0.32 0.309 0.298 0.288 0.278 0.268 0.259 0.25 0.241 0.233 0.224 0.217 0.209 0.202

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.346" PeakHeight="110.0" Num="3" Error="0.0">
-27.727 9.399 -1.66
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.346" EndFrequency="12.35" PeakHeight="347.271" Num="5" zHalfNm="288.04" Error="1.909">
-173.719 -41.484 17.527 -3.295 1.106
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="37.406" Depth="0.155"/>
<TopsideChapman PeakHeight="347.271" PeakDensity="1892338.8" PeakScaleHeight="43.864" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
