<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 11:50:00.000"
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="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: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</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" >
2026.04.03 (093) 11:50:00</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">
FF202609304031150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="12.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.088" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="38.444" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.550" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.250" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.160" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="91.141" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.599" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="7.467" 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="371.961" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.985" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.166" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="295.698" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="232.849" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.856" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="87.074" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.375" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="49.061" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="91.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.920" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="175">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 12.4 12.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 222.000 224.000 226.000 228.000 230.000 235.000 238.000 241.000 244.000 247.000 250.000 250.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 276.250 277.500 278.750 280.000 280.000 280.000 280.000 280.000 280.000 280.000 281.667 283.333 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 291.111 292.222 293.333 294.444 295.556 296.667 297.778 298.889 300.000 300.000 300.000 300.833 301.667 302.500 303.333 304.167 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 311.667 313.333 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 321.667 323.333 325.000 326.667 328.333 330.000 330.000 331.667 333.333 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 341.429 342.857 344.286 345.714 347.143 348.571 350.000 350.000 350.000 351.667 353.333 355.000 355.000 355.000 357.500 360.000 362.528 365.330 368.455 371.961 375.923 380.436 385.622 391.645 398.726 407.170 417.413 430.096 446.212 467.371 496.380
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 45 0 0 51 0 57 54 0 54 0 0 0 54 0 0 0 0 54 60 54 60 57 51 57 57 54 54 54 57 0 45 51 51 51 51 0 0 57 60 63 54 60 63 66 69 69 72 72 69 66 63 60 60 54 45 0 0 66 69 69 66 63 57 54 48 0 72 72 72 69 66 63 75 75 75 75 75 0 0 69 66 0 54 0 0 0 0 0 0 75 75 72 0 69 0 0 0 57 57 54 63 63 0 75 75 72 0 0 66 69 69 69 51 0 0 69 69 69 69 63 54 54 57 54 0 0 0 0 0 54 57 0 0 48 0 54 0 54 0 48 54 0 0 0 0 0 0 60 0 57 0 48 57 57 48 57 0 54 0 54 0 0 45 45 0 54 48 51 54 51 48 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 1.953125 -0.390625 -0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="19">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
91.141 91.505 91.890 92.297 92.730 93.192 93.686 94.217 94.790 95.412 96.094 96.848 97.691 98.649 99.763 101.097 102.774 105.068 108.842
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 0 0 0 69 0 66 63 0 0 0 51 0 66 0 63 63 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -2.734375 2.734375 -1.953125 -0.390625 -0.390625 -0.390625 -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="Es" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 110.000 108.333 106.667 105.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 51 57 45 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
</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" >
86.953 90.0 94.599 95.0 97.883 100.0 101.166 104.45 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 295.698 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.497 3.16 3.158 3.031 3.031 3.031 3.16 3.172 3.279 3.39 3.505 3.623 3.746 3.874 4.008 4.148 4.294 4.449 4.612 4.785 4.969 5.165 5.374 5.598 5.838 6.098 6.377 6.679 7.006 7.357 7.734 8.134 8.556 8.993 9.437 9.879 10.31 10.718 11.095 11.435 11.731 11.98 12.178 12.323 12.414 12.449 12.45 12.441 12.408 12.353 12.278 12.183 12.071 11.944 11.803 11.648 11.483 11.308 11.124 10.933 10.735 10.532 10.325 10.114 9.901 9.686 9.47 9.253 9.037 8.821 8.606 8.392 8.181 7.972 7.765 7.561 7.36 7.162 6.968 6.777 6.59 6.406 6.226 6.05 5.877 5.709 5.544 5.384 5.227 5.074 4.925 4.779 4.638 4.5 4.366 4.235 4.108 3.984 3.864 3.747 3.633 3.523 3.416 3.312 3.211 3.112 3.017 2.924 2.834 2.747 2.663 2.581 2.501 2.424 2.349 2.276 2.206 2.137 2.071 2.007 1.944 1.884 1.825 1.768 1.713 1.66 1.608 1.558 1.51 1.463 1.417 1.373 1.33 1.288 1.248 1.209 1.171 1.135 1.099 1.065 1.032 0.999 0.968 0.938 0.909 0.88 0.853 0.826 0.8 0.775 0.751 0.727 0.704 0.682 0.661 0.64 0.62 0.601 0.582 0.564 0.546 0.529 0.512 0.496 0.481 0.466 0.451 0.437 0.423 0.41 0.397 0.385 0.373 0.361 0.35 0.339 0.328 0.318 0.308 0.298 0.289 0.28 0.271 0.263 0.254 0.246 0.239 0.231

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.16" PeakHeight="94.599" Num="3" Error="0.611">
-11.322 4.814 -1.138
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.16" EndFrequency="12.45" PeakHeight="295.698" Num="5" zHalfNm="232.849" Error="3.15">
-148.294 -34.914 -9.829 1.254 0.535
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.851" Depth="0.129"/>
<TopsideChapman PeakHeight="295.698" PeakDensity="1923108.0" PeakScaleHeight="49.061" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
