<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 16:40:00.000"
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="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" >
2026.01.28 (028) 16:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202602801281640009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.282" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.393" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.550" 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="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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="585.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.283" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.310" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="405.924" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="268.654" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.856" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="175.052" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="55.352" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="97.645" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="229.630" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.260" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="90">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
360.000 365.000 370.000 372.500 375.000 375.000 376.667 378.333 380.000 380.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 387.500 390.000 395.000 397.143 399.286 401.429 403.571 405.714 407.857 410.000 410.000 410.000 415.000 417.500 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 440.000 450.000 450.000 455.000 455.000 460.000 465.000 470.000 475.000 475.000 480.000 480.000 490.000 495.000 495.000 500.000 500.000 510.000 510.000 515.000 520.000 525.000 530.000 540.000 540.000 545.000 545.000 550.000 555.000 560.000 560.000 565.000 565.000 570.000 575.000 580.000 585.000 585.000 589.606 594.646 600.183 606.296 613.079 620.648 629.149 638.765 649.730 662.352 677.034 694.327 714.994
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 48 48 54 54 0 0 54 51 51 54 0 57 57 51 48 0 57 54 0 51 0 0 51 0 48 57 63 57 0 57 48 60 54 63 60 60 63 60 54 66 63 63 66 63 63 60 66 66 63 60 57 63 63 63 63 63 63 63 63 60 54 63 60 63 60 57 51 60 57 57 57 0 51 45 54 51 51 48 48 48 48 48 45 0 45 42 45 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 -2.734375 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -1.171875 -2.734375 -0.390625 -0.390625 -1.171875 -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" >
89.5 90.0 95.0 100.0 105.0 110.0 111.995 113.991 115.0 115.986 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 405.924 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.208 2.841 3.176 3.283 3.161 3.161 3.223 3.283 3.417 3.565 3.702 3.833 3.96 4.086 4.21 4.334 4.458 4.582 4.707 4.832 4.958 5.085 5.213 5.341 5.469 5.599 5.728 5.858 5.988 6.118 6.248 6.378 6.508 6.638 6.768 6.897 7.026 7.154 7.282 7.41 7.537 7.665 7.791 7.917 8.043 8.169 8.294 8.419 8.544 8.668 8.792 8.915 9.037 9.159 9.28 9.4 9.518 9.633 9.746 9.853 9.954 10.046 10.126 10.189 10.232 10.25 10.25 10.248 10.242 10.23 10.213 10.192 10.167 10.137 10.103 10.066 10.024 9.979 9.931 9.879 9.824 9.767 9.707 9.644 9.578 9.51 9.44 9.369 9.295 9.219 9.142 9.063 8.983 8.901 8.819 8.735 8.651 8.565 8.479 8.392 8.304 8.216 8.127 8.039 7.949 7.86 7.771 7.681 7.591 7.502 7.412 7.323 7.234 7.145 7.056 6.968 6.88 6.792 6.705 6.619 6.533 6.447 6.362 6.278 6.194 6.11 6.028 5.946 5.865 5.784 5.704 5.625 5.547 5.469 5.393 5.317 5.241 5.167 5.093 5.02 4.948 4.877 4.806 4.737 4.668 4.6 4.532 4.466 4.4 4.335 4.271 4.208 4.145 4.084 4.023 3.963 3.903 3.845 3.787 3.73 3.674 3.618 3.564 3.51 3.456 3.404 3.352 3.301 3.251 3.201 3.152 3.104 3.056 3.009 2.963 2.917 2.872 2.828 2.785 2.742 2.699 2.657 2.616 2.576 2.536 2.496

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.283" PeakHeight="110.0" Num="3" Error="0.0">
-30.422 13.035 -3.113
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.283" EndFrequency="10.25" PeakHeight="405.924" Num="5" zHalfNm="268.654" Error="4.56">
-248.527 -63.965 27.024 -6.906 2.436
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.986" Depth="0.122"/>
<TopsideChapman PeakHeight="405.924" PeakDensity="1303505.0" PeakScaleHeight="97.645" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
