<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-17 -076 18:20:00.000"
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: 95% PACIFIC flags: 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" >
2026.03.17 (076) 18:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607603171820009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.559" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.377" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.500" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.810" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="210.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="210.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="108.581" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="100.188" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="9.978" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.975" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.161" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="364.950" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="259.159" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.475" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="141.467" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.831" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="77.319" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="171.790" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.400" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="137">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
210.000 215.000 220.000 225.000 230.000 235.000 240.000 245.000 250.000 252.500 255.000 257.778 260.556 263.333 266.111 268.889 271.667 274.444 277.222 280.000 280.000 280.000 285.000 285.000 285.000 290.000 290.000 290.000 291.250 292.500 293.750 295.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 312.000 314.000 316.000 318.000 320.000 322.500 325.000 325.000 327.500 330.000 330.000 330.000 335.000 335.000 337.500 340.000 345.000 345.000 345.000 350.000 350.000 351.667 353.333 355.000 360.000 360.000 362.500 365.000 367.500 370.000 370.000 372.500 375.000 375.000 380.000 380.000 380.000 385.000 386.667 388.333 390.000 395.000 395.000 397.500 400.000 400.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 422.500 425.000 425.000 430.000 430.000 430.000 435.000 435.000 440.000 442.500 445.000 447.500 450.000 450.000 450.000 452.500 455.000 460.000 460.000 465.000 465.000 470.000 475.000 475.000 475.000 485.000 490.000 490.000 495.000 500.000 505.000 510.000 520.000 525.000 535.000 540.000 549.667 560.690 573.378 588.138 605.522 626.300
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 0 0 0 0 0 60 0 60 0 54 0 0 0 0 57 0 0 54 60 54 63 60 0 0 0 0 0 0 0 0 57 54 0 57 54 0 0 60 0 0 60 51 54 63 0 57 63 63 63 63 0 57 54 60 63 54 57 0 0 66 57 60 0 60 0 51 57 0 60 66 51 57 60 51 0 0 57 45 54 0 51 63 54 63 66 63 63 60 63 57 60 60 57 63 66 63 66 69 69 69 63 51 0 0 51 63 63 48 60 57 63 57 60 63 57 66 63 60 57 60 57 54 54 57 57 57 54 54 54 54 51 51 51 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 1.953125 1.953125 -2.734375 1.171875 -1.171875 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 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 1.171875 -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 -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 -0.390625 -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="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 2.65 2.7 2.75 2.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
108.581 109.112 109.686 110.310 110.993 111.747 112.592
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 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 -2.734375 -0.390625 -2.734375
</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 95.0 100.0 100.188 103.517 105.0 106.845 110.0 110.174 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 364.95 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.4 2.809 2.81 2.695 2.695 2.695 2.804 2.81 2.929 3.055 3.182 3.311 3.443 3.579 3.717 3.859 4.004 4.152 4.304 4.459 4.617 4.778 4.942 5.108 5.277 5.448 5.62 5.795 5.971 6.148 6.326 6.506 6.686 6.867 7.049 7.231 7.414 7.597 7.78 7.963 8.146 8.329 8.512 8.694 8.875 9.055 9.233 9.409 9.581 9.75 9.913 10.069 10.215 10.349 10.466 10.564 10.638 10.685 10.7 10.7 10.696 10.683 10.662 10.634 10.598 10.555 10.506 10.451 10.389 10.323 10.251 10.174 10.093 10.007 9.918 9.825 9.729 9.629 9.528 9.423 9.316 9.208 9.097 8.985 8.872 8.757 8.642 8.525 8.408 8.291 8.173 8.055 7.937 7.818 7.7 7.583 7.466 7.349 7.232 7.117 7.002 6.888 6.775 6.662 6.551 6.44 6.331 6.223 6.116 6.01 5.905 5.801 5.699 5.598 5.498 5.4 5.303 5.207 5.113 5.019 4.928 4.837 4.748 4.66 4.574 4.489 4.405 4.323 4.242 4.162 4.083 4.006 3.93 3.856 3.782 3.71 3.639 3.569 3.501 3.434 3.368 3.303 3.239 3.176 3.115 3.055 2.995 2.937 2.88 2.824 2.769 2.715 2.662 2.61 2.559 2.509 2.459 2.411 2.364 2.317 2.272 2.227 2.183 2.14 2.098 2.057 2.016 1.976 1.937 1.899 1.861 1.824 1.788 1.753 1.718 1.684 1.651 1.618 1.586 1.554 1.524 1.493 1.464 1.435 1.406 1.378 1.351

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.81" PeakHeight="100.188" Num="3" Error="4.312">
-14.98 6.215 -1.423
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.81" EndFrequency="10.7" PeakHeight="364.95" Num="5" zHalfNm="259.159" Error="3.407">
-218.136 -47.943 14.7 -4.432 1.035
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.986" Depth="0.115"/>
<TopsideChapman PeakHeight="364.95" PeakDensity="1420471.5" PeakScaleHeight="77.319" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
