<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 17:30:00.000"
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: 100%</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) 17:30:00</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">
FF202609003311730009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.429" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.476" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.350" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.710" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="92.191" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="92.219" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="2.175" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="530.000" 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="3.155" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.250" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="377.715" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="261.671" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.258" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="153.889" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.027" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="82.338" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="190.980" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.290" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="122">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 270.000 270.000 273.750 277.500 281.250 285.000 290.000 295.000 296.250 297.500 298.750 300.000 305.000 305.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 320.000 321.250 322.500 323.750 325.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 340.000 340.000 342.500 345.000 345.000 345.000 347.500 350.000 360.000 355.000 357.500 360.000 365.000 365.000 370.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 455.000 455.000 465.000 465.000 470.000 470.000 475.000 480.000 480.000 480.000 485.000 485.000 490.000 490.000 495.000 500.000 500.000 505.000 505.000 510.000 510.000 512.500 515.000 515.000 520.000 525.000 530.000 530.000 535.000 540.000 545.000 550.000 555.000 560.000 565.000 572.500 580.000 588.753 598.738 610.236 623.617 639.387
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 48 0 0 0 51 51 48 0 0 0 54 54 57 54 60 57 57 57 57 54 57 0 54 0 57 54 60 57 54 60 60 54 57 60 0 60 60 60 0 57 51 60 0 60 57 63 60 48 57 63 54 63 57 60 54 60 54 63 63 63 57 63 57 63 60 63 60 54 60 54 60 57 60 60 54 60 60 60 60 60 54 60 57 60 57 51 57 60 57 57 57 57 57 45 51 45 51 45 51 0 54 51 54 51 48 51 0 51 51 48 48 48 45 0 45 45 0 42 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 -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 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -2.734375 0.390625 0.390625 -1.953125 -0.390625 2.734375 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
92.191 92.625 93.087 93.581 94.112 94.686 95.310 95.993
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 54 0 0 48 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
</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 92.219 94.757 95.0 97.294 99.832 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 377.715 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.71 2.605 2.605 2.605 2.71 2.716 2.871 3.013 3.149 3.282 3.416 3.55 3.686 3.825 3.966 4.11 4.258 4.408 4.562 4.718 4.876 5.037 5.2 5.364 5.529 5.694 5.86 6.026 6.192 6.358 6.522 6.687 6.85 7.013 7.174 7.335 7.495 7.654 7.813 7.971 8.128 8.285 8.441 8.597 8.752 8.907 9.062 9.216 9.37 9.524 9.677 9.829 9.98 10.129 10.275 10.416 10.549 10.671 10.774 10.851 10.894 10.9 10.899 10.892 10.877 10.855 10.826 10.791 10.75 10.703 10.65 10.592 10.529 10.461 10.389 10.313 10.232 10.149 10.062 9.971 9.878 9.783 9.685 9.584 9.482 9.378 9.272 9.165 9.057 8.947 8.837 8.726 8.614 8.502 8.389 8.276 8.163 8.05 7.938 7.825 7.712 7.6 7.488 7.377 7.266 7.156 7.047 6.938 6.831 6.724 6.618 6.512 6.408 6.305 6.203 6.102 6.002 5.903 5.805 5.708 5.613 5.519 5.425 5.333 5.243 5.153 5.065 4.977 4.891 4.807 4.723 4.641 4.56 4.48 4.401 4.323 4.247 4.172 4.098 4.025 3.953 3.882 3.813 3.744 3.677 3.611 3.546 3.482 3.419 3.357 3.296 3.236 3.177 3.12 3.063 3.007 2.952 2.898 2.845 2.793 2.741 2.691 2.642 2.593 2.545 2.498 2.452 2.407 2.363 2.319 2.276 2.234 2.193 2.152 2.112 2.073 2.035 1.997 1.96 1.923 1.888 1.852 1.818 1.784 1.751 1.718 1.686

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.71" PeakHeight="92.219" Num="3" Error="0.41">
-3.255 1.34 -0.304
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.71" EndFrequency="10.9" PeakHeight="377.715" Num="5" zHalfNm="261.671" Error="3.551">
-237.51 -61.779 28.298 -10.289 3.397
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.613" Depth="0.105"/>
<TopsideChapman PeakHeight="377.715" PeakDensity="1474069.5" PeakScaleHeight="82.338" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
