<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 21:30:00.000"
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="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.02.25 (056) 21:30:00</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">
FF202605602252130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.357" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.742" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="310.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" Name="h`F2" 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="7.800" 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="0.770" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="458.120" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="325.271" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.088" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="188.868" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="39.672" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="99.927" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="166.560" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.180" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="112">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.25 3.3 3.35 3.4 3.45 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 310.000 320.000 310.000 310.000 310.000 315.000 316.667 318.333 320.000 321.667 323.333 325.000 325.000 326.500 328.000 329.500 331.000 332.500 334.000 335.500 337.000 338.500 340.000 335.000 336.875 338.750 340.625 342.500 344.375 346.250 348.125 350.000 350.000 350.000 350.000 355.000 356.250 357.500 358.750 360.000 365.000 365.833 366.667 367.500 368.333 369.167 370.000 375.000 376.000 377.000 378.000 379.000 380.000 383.000 386.000 389.000 392.000 395.000 395.000 400.000 402.500 405.000 410.000 412.500 415.000 415.000 420.000 420.000 425.000 430.000 430.000 430.000 435.000 440.000 445.000 445.000 450.000 455.000 460.000 460.000 465.000 470.000 475.000 477.500 480.000 485.000 490.000 500.000 505.000 505.000 510.000 525.000 525.000 530.000 540.000 545.000 555.000 565.000 575.000 580.000 590.388 601.989 615.029 629.794 646.649 666.073 688.701 715.397 747.367 786.344 834.917
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 54 60 0 48 57 0 51 0 54 0 54 60 0 0 0 0 0 0 0 0 0 54 0 0 0 0 0 0 60 0 57 66 0 51 45 0 0 0 63 51 0 0 0 0 0 0 60 0 0 0 0 60 0 0 0 0 54 54 63 0 63 57 51 57 63 66 69 69 63 69 66 63 57 63 69 66 66 66 72 0 0 63 0 51 57 60 57 60 63 69 57 63 69 72 72 69 72 69 63 57 54 54 0 54 0 0 0 54 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 1.953125 -1.953125 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 1.953125 0.390625 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 -2.734375 -2.734375 -1.953125 -1.953125 -1.953125 -0.390625 -1.171875 -1.171875 -2.734375 0.390625 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.608 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 133.623 135.0 140.0 145.0 150.0 155.0 157.246 160.0 165.0 170.0 175.0 180.0 180.869 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 458.12 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.511 0.667 0.745 0.77 0.758 0.721 0.656 0.552 0.435 0.435 0.435 0.435 0.435 0.435 0.435 0.474 0.545 0.616 0.687 0.758 0.77 0.823 0.889 0.959 1.033 1.114 1.201 1.297 1.403 1.521 1.652 1.799 1.965 2.151 2.36 2.592 2.845 3.115 3.397 3.685 3.974 4.259 4.537 4.806 5.066 5.315 5.555 5.784 6.002 6.211 6.411 6.601 6.782 6.955 7.119 7.274 7.422 7.561 7.693 7.816 7.932 8.041 8.142 8.236 8.322 8.401 8.473 8.537 8.595 8.645 8.689 8.725 8.754 8.776 8.791 8.799 8.8 8.8 8.796 8.788 8.776 8.761 8.741 8.718 8.692 8.662 8.63 8.594 8.555 8.514 8.47 8.423 8.375 8.323 8.27 8.215 8.158 8.099 8.039 7.977 7.913 7.848 7.782 7.715 7.647 7.578 7.507 7.436 7.365 7.293 7.22 7.146 7.072 6.998 6.924 6.849 6.774 6.699 6.624 6.549 6.474 6.398 6.323 6.249 6.174 6.099 6.025 5.951 5.878 5.804 5.731 5.659 5.587 5.515 5.444 5.373 5.303 5.233 5.164 5.095 5.027 4.96 4.893 4.827 4.761 4.696 4.631 4.568 4.504 4.442 4.38 4.319 4.258 4.198 4.139 4.08 4.022 3.965 3.908 3.852 3.797 3.742 3.688 3.635 3.582 3.53 3.479 3.428 3.378 3.328 3.28 3.231 3.184 3.137 3.091 3.045 3.0 2.955 2.911 2.868 2.825 2.783 2.742 2.701 2.66 2.62

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.77" PeakHeight="110.0" Num="3" Error="0.0">
-25.202 6.686 -0.876
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.77" EndFrequency="8.8" PeakHeight="458.12" Num="5" zHalfNm="325.271" Error="3.241">
-311.669 55.201 -23.388 1.253 1.352
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="70.869" Depth="0.335"/>
<TopsideChapman PeakHeight="458.12" PeakDensity="960794.06" PeakScaleHeight="99.927" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
