<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 14:10:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 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" >
2026.03.31 (090) 14:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202609003311410009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.471" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.094" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.450" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.010" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.050" 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="24" Val="93.781" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.302" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="4.206" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="425.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.373" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.352" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="374.535" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="230.221" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.774" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="191.174" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="52.063" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="103.862" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="218.160" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.640" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="92">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 282.500 285.000 285.000 290.000 292.500 295.000 295.000 295.000 297.000 299.000 301.000 303.000 305.000 310.000 312.500 315.000 317.500 320.000 322.500 325.000 327.500 330.000 332.500 335.000 337.500 340.000 340.000 345.000 345.000 350.000 350.000 355.000 355.000 357.500 360.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 385.000 390.000 395.000 395.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 425.000 425.000 435.000 435.000 440.000 445.000 450.000 460.000 465.000 470.000 475.000 480.000 495.000 500.000 505.000 505.000 520.000 525.000 525.000 530.000 540.000 550.000 555.000 560.000 567.766 576.304 585.736 596.209 607.906 621.055 635.944 652.943 672.535 695.361 722.296
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 48 48 48 0 48 48 48 0 0 0 0 45 51 0 0 0 48 0 0 0 0 0 0 0 54 60 51 60 51 60 51 54 0 57 63 57 63 60 63 57 63 63 63 60 63 57 57 63 60 57 66 60 57 63 63 63 60 54 57 57 57 57 57 60 57 57 60 51 54 60 60 51 54 57 60 60 54 57 54 57 54 54 54 51 48 51 48 51 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.953125 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 1.171875 0.390625 -0.390625 0.390625 0.390625 -0.390625 -2.734375 1.953125 2.734375 0.390625 1.171875 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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="12">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
93.781 94.250 94.742 95.259 95.805 96.381 96.990 97.636 98.325 99.060 99.849 100.701
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 60 0 60 0 0 0 0 0 0 51
</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 1.953125 -0.390625 -0.390625 -2.734375
</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" >
90.0 94.302 95.0 95.924 97.546 99.168 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 374.535 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.01 2.99 2.9 2.9 3.01 3.036 3.182 3.316 3.444 3.571 3.699 3.828 3.96 4.095 4.234 4.378 4.525 4.677 4.833 4.991 5.153 5.316 5.48 5.644 5.807 5.968 6.128 6.286 6.44 6.592 6.742 6.888 7.031 7.172 7.31 7.445 7.578 7.708 7.835 7.961 8.084 8.205 8.324 8.44 8.555 8.666 8.776 8.883 8.986 9.087 9.184 9.276 9.364 9.446 9.52 9.587 9.644 9.69 9.724 9.744 9.75 9.75 9.747 9.741 9.73 9.715 9.696 9.673 9.647 9.617 9.585 9.548 9.509 9.467 9.422 9.375 9.325 9.273 9.218 9.161 9.102 9.042 8.979 8.915 8.849 8.781 8.713 8.642 8.571 8.499 8.425 8.351 8.276 8.2 8.123 8.046 7.968 7.889 7.81 7.731 7.652 7.572 7.492 7.412 7.332 7.252 7.172 7.092 7.012 6.932 6.852 6.773 6.694 6.615 6.536 6.458 6.38 6.302 6.225 6.149 6.073 5.997 5.922 5.847 5.773 5.699 5.626 5.554 5.482 5.411 5.34 5.27 5.201 5.132 5.064 4.997 4.93 4.864 4.799 4.734 4.67 4.606 4.544 4.482 4.42 4.359 4.299 4.24 4.181 4.123 4.066 4.009 3.954 3.898 3.844 3.79 3.736 3.684 3.632 3.58 3.529 3.479 3.43 3.381 3.333 3.285 3.238 3.192 3.146 3.101 3.057 3.013 2.969 2.926 2.884 2.843 2.801 2.761 2.721 2.681 2.643 2.604 2.566 2.529 2.492 2.456 2.42

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.01" PeakHeight="94.302" Num="3" Error="0.753">
-6.352 2.674 -0.624
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.01" EndFrequency="9.75" PeakHeight="374.535" Num="5" zHalfNm="230.221" Error="5.805">
-257.378 -29.432 16.984 -9.171 3.63
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.866" Depth="0.11"/>
<TopsideChapman PeakHeight="374.535" PeakDensity="1179435.5" PeakScaleHeight="103.862" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
