<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-01 -060 19:30:00.000"
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 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" >
2026.03.01 (060) 19:30:00</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">
FF202606003011930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="12.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.511" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.515" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.450" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.510" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="94.061" Name="h`E" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.568" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="385.118" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="281.636" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.679" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="143.516" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="68.231" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="75.836" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="159.920" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.600" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="187">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 230.000 232.500 235.000 240.000 245.000 245.000 247.500 250.000 252.500 255.000 255.000 257.500 260.000 260.000 262.500 265.000 265.000 265.000 265.000 265.000 260.000 262.500 265.000 265.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 270.000 272.500 275.000 275.000 275.000 280.000 280.000 280.000 285.000 285.000 285.000 285.000 287.500 290.000 292.500 295.000 297.500 300.000 300.000 300.000 300.000 300.000 305.000 306.667 308.333 310.000 311.667 313.333 315.000 316.667 318.333 320.000 320.000 320.000 322.500 325.000 330.000 332.500 335.000 335.000 335.000 335.000 340.000 340.000 340.000 342.500 345.000 345.000 345.000 345.000 350.000 350.000 350.000 352.500 355.000 357.500 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 387.500 390.000 390.000 390.000 390.000 392.500 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 406.250 407.500 408.750 410.000 410.000 410.000 410.000 410.000 411.250 412.500 413.750 415.000 420.000 421.667 423.333 425.000 427.500 430.000 425.000 426.667 428.333 430.000 433.333 436.667 440.000 440.000 445.000 445.000 450.000 452.500 455.000 450.000 455.000 460.000 465.000 467.500 470.000 470.000 470.000 475.000 480.000 480.000 482.500 485.000 490.000 495.000 495.000 500.000 505.000 507.500 510.000 515.000 525.000 530.000 530.000 536.350 543.270 550.842 559.161 568.345 578.536 589.908 602.680 617.128 633.603 652.565
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 0 51 48 45 48 0 0 0 54 57 0 60 0 0 0 0 0 60 60 57 0 63 63 63 63 0 60 63 0 60 60 0 63 54 60 63 66 66 63 63 63 60 0 0 0 0 0 51 57 63 63 63 63 0 0 48 0 0 0 0 0 63 66 69 0 66 57 0 48 57 63 66 57 63 66 0 63 69 54 69 66 66 72 0 72 60 66 69 72 63 66 72 60 63 66 57 63 66 66 66 69 69 60 66 72 60 66 69 54 69 0 69 57 63 66 0 66 63 66 0 0 0 66 66 66 63 54 0 0 0 60 60 0 0 63 0 54 54 0 0 60 0 0 57 60 54 57 51 0 45 57 57 51 42 0 42 51 57 54 48 54 0 54 0 51 57 57 57 0 51 54 51 54 54 45 54 51 54 51 0 51 42 0 0 42
</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 2.734375 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 -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 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 1.171875 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.45 2.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
94.061 95.758
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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" >
89.638 90.0 95.0 100.0 105.0 110.0 115.0 115.244 120.0 120.487 125.0 125.731 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 385.118 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.23 1.685 2.173 2.429 2.51 2.4 2.389 2.389 2.389 2.493 2.51 2.627 2.767 2.911 3.059 3.214 3.374 3.542 3.717 3.899 4.089 4.287 4.492 4.704 4.923 5.149 5.38 5.615 5.854 6.097 6.342 6.589 6.838 7.087 7.337 7.587 7.837 8.086 8.335 8.583 8.831 9.077 9.322 9.565 9.807 10.047 10.286 10.521 10.754 10.984 11.209 11.429 11.643 11.85 12.047 12.232 12.403 12.557 12.691 12.8 12.882 12.932 12.95 12.95 12.945 12.929 12.903 12.868 12.823 12.77 12.709 12.639 12.563 12.479 12.39 12.294 12.192 12.086 11.975 11.859 11.739 11.615 11.489 11.359 11.226 11.091 10.954 10.815 10.674 10.532 10.389 10.245 10.1 9.955 9.81 9.664 9.518 9.372 9.227 9.082 8.938 8.794 8.651 8.509 8.368 8.228 8.089 7.952 7.815 7.68 7.546 7.414 7.283 7.154 7.026 6.9 6.775 6.652 6.531 6.411 6.293 6.176 6.062 5.948 5.837 5.727 5.619 5.513 5.409 5.306 5.204 5.105 5.007 4.91 4.816 4.723 4.631 4.541 4.453 4.366 4.281 4.197 4.115 4.034 3.955 3.877 3.8 3.725 3.652 3.579 3.508 3.439 3.371 3.304 3.238 3.173 3.11 3.048 2.987 2.927 2.869 2.811 2.755 2.7 2.645 2.592 2.54 2.489 2.439 2.39 2.342 2.295 2.248 2.203 2.158 2.115 2.072 2.03 1.989 1.949 1.91 1.871 1.833 1.796 1.76 1.724 1.689

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.51" PeakHeight="110.0" Num="3" Error="0.0">
-29.726 12.027 -2.663
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.51" EndFrequency="12.95" PeakHeight="385.118" Num="5" zHalfNm="281.636" Error="4.328">
-233.392 -34.805 13.414 -6.315 1.711
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="15.731" Depth="0.121"/>
<TopsideChapman PeakHeight="385.118" PeakDensity="2080676.1" PeakScaleHeight="75.836" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
