<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 13:40:00.000"
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="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" >
2026.02.21 (052) 13:40:00</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">
FF202605202211340009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="33" >
<URSI ID="00" Val="9.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.483" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.332" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.800" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.460" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="360.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="360.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="93.789" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="125.556" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="95.210" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="7.058" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="510.000" 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="3.311" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.324" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="347.707" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="221.119" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.183" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="157.073" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.783" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="88.831" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="213.220" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.230" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="6.550" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="66">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
360.000 360.000 360.000 362.500 365.000 367.500 370.000 370.000 370.000 370.000 375.000 375.000 375.000 378.125 381.250 384.375 387.500 390.625 393.750 396.875 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 450.000 450.000 455.000 460.000 460.000 465.000 470.000 475.000 475.000 485.000 485.000 490.000 495.000 500.000 505.000 510.000 510.000 515.000 520.000 525.000 530.000 540.000 545.000 555.000 560.000 570.000 580.000 591.716 605.372 621.492
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 54 0 0 0 66 69 66 60 63 63 60 0 0 0 0 0 0 0 57 66 57 63 60 66 66 66 63 57 60 60 60 66 69 72 69 69 69 66 57 57 57 57 66 63 60 57 57 60 63 60 66 66 63 60 60 60 57 57 63 63 51 51 57 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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
93.789 94.280 94.807 95.375 95.993 96.668 97.415 98.250 99.199 100.302 101.624 103.288 105.566 109.320
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 57 66 63 60 0 66 66 63 0 0 0 51 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 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="64">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
97.222 99.444 101.667 103.889 106.111 108.333 110.556 112.778 115.000 117.222 119.444 121.667 123.889 126.111 128.333 130.556 132.778 135.000 130.000 130.000 130.000 130.000 130.000 130.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 48 51 51 0 0 0 54 48 48 51 45 0 0 0 57 0 51 57 0 0 0 51 60 0 66 0 66 66 63 0 0 66 66 60 0 51 60 51 0 0 0 54 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 -2.734375 1.953125 -0.390625 1.171875 -2.734375 -1.171875 1.171875 -2.734375 -1.171875 1.171875 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 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -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="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
87.966 90.0 95.0 95.21 97.086 98.961 100.0 100.837 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 347.707 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.369 3.458 3.46 3.332 3.332 3.403 3.46 3.6 3.764 3.926 4.085 4.242 4.397 4.55 4.701 4.849 4.996 5.141 5.285 5.426 5.566 5.705 5.842 5.978 6.113 6.246 6.379 6.51 6.641 6.771 6.901 7.03 7.158 7.286 7.414 7.541 7.669 7.796 7.923 8.05 8.177 8.304 8.43 8.557 8.684 8.81 8.935 9.059 9.182 9.301 9.416 9.523 9.62 9.702 9.762 9.795 9.8 9.799 9.794 9.782 9.765 9.743 9.716 9.683 9.646 9.605 9.559 9.51 9.457 9.4 9.339 9.276 9.209 9.14 9.068 8.994 8.917 8.838 8.757 8.675 8.591 8.505 8.418 8.33 8.241 8.151 8.059 7.968 7.875 7.782 7.689 7.595 7.501 7.407 7.313 7.219 7.125 7.031 6.937 6.843 6.75 6.657 6.565 6.473 6.382 6.291 6.201 6.111 6.022 5.934 5.846 5.76 5.674 5.588 5.504 5.42 5.338 5.256 5.175 5.095 5.016 4.937 4.86 4.783 4.708 4.633 4.559 4.487 4.415 4.344 4.274 4.205 4.137 4.07 4.003 3.938 3.874 3.81 3.747 3.686 3.625 3.565 3.506 3.448 3.39 3.334 3.278 3.224 3.17 3.117 3.064 3.013 2.962 2.912 2.863 2.815 2.767 2.72 2.674 2.629 2.584 2.54 2.497 2.455 2.413 2.372 2.331 2.291 2.252 2.214 2.176 2.139 2.102 2.066 2.031 1.996 1.961 1.928 1.895 1.862 1.83 1.798 1.767 1.737 1.707 1.678 1.649 1.62

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.46" PeakHeight="95.21" Num="3" Error="0.647">
-10.78 4.666 -1.13
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.46" EndFrequency="9.8" PeakHeight="347.707" Num="5" zHalfNm="221.119" Error="2.68">
-212.77 -55.11 26.09 -5.787 0.707
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.627" Depth="0.128"/>
<TopsideChapman PeakHeight="347.707" PeakDensity="1191563.2" PeakScaleHeight="88.831" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
