<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-25 -298 22:30:00.000"
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="14.0">
<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 33 2 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Severe F-spread, F2x cusp not found, Multiple candidates for F2o 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" >
2026.10.25 (298) 22:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.40" 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">
FF202629810252230009039031101000005014000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.793" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.255" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="325.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="325.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="446.774" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="392.961" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="341.015" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.181" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="76.940" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="27.676" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="38.971" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="79.200" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.730" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="153">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
360.000 355.000 355.000 350.833 346.667 342.500 338.333 334.167 330.000 325.000 325.000 325.000 325.000 325.000 325.000 325.898 326.797 327.695 328.594 329.492 330.391 331.289 332.188 333.086 333.984 334.883 335.781 336.680 337.578 338.477 339.375 340.273 341.172 342.070 342.969 343.867 344.766 345.664 346.563 347.461 348.359 349.258 350.156 351.055 351.953 352.852 353.750 354.648 355.547 356.445 357.344 358.242 359.141 360.039 360.938 361.836 362.734 363.633 364.531 365.430 366.328 367.227 368.125 369.023 369.922 370.820 371.719 372.617 373.516 374.414 375.313 376.211 377.109 378.008 378.906 379.805 380.703 381.602 382.500 383.398 384.297 385.195 386.094 386.992 387.891 388.789 389.688 390.586 391.484 392.383 393.281 394.180 395.078 395.977 396.875 397.773 398.672 399.570 400.469 401.367 402.266 403.164 404.063 404.961 405.859 406.758 407.656 408.555 409.453 410.352 411.250 412.148 413.047 413.945 414.844 415.742 416.641 417.539 418.438 419.336 420.234 421.133 422.031 422.930 423.828 424.727 425.625 426.523 427.422 428.320 429.219 430.117 431.016 431.914 432.813 433.711 434.609 435.508 436.406 437.305 438.203 439.102 440.000 443.131 446.774 451.065 456.194 462.431 470.182 480.073 493.131 511.169 537.705
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 60 57 0 0 0 0 0 66 60 57 60 60 60 0 0 63 0 0 0 0 57 0 0 0 0 0 0 0 0 0 0 0 0 57 0 0 0 0 0 0 0 0 0 0 0 54 57 0 0 63 0 0 0 54 0 63 0 0 0 57 0 0 0 0 0 0 0 0 0 0 0 60 60 0 0 60 0 0 0 0 0 0 0 0 0 57 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 45 0 0 0 0 0 0 0 0 0 0 0 0 45 48 45 0 42 0 0 0 0 0 0 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 0.390625 1.171875 1.953125 1.953125 1.953125 1.171875 1.171875 -0.390625 1.953125 1.953125 1.953125 2.734375 1.953125 1.171875 1.953125 1.171875 1.953125 1.953125 0.390625 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.953125 1.953125 2.734375 1.171875 -2.734375 1.953125 1.171875 2.734375 0.390625 -1.171875 -2.734375 1.953125 1.953125 1.171875 2.734375 0.390625 0.390625 0.390625 -0.390625 1.171875 -1.953125 -1.171875 -0.390625 0.390625 0.390625 -0.390625 -0.390625 1.171875 -0.390625 -1.171875 -1.953125 -1.171875 1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 0.390625 -0.390625 1.171875 -0.390625 -1.171875 1.953125 -1.171875 -1.953125 1.171875 -0.390625 0.390625 1.953125 -1.953125 1.953125 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 0.390625 -1.953125 -1.953125 -1.171875 -1.171875 -2.734375 0.390625 -2.734375 -1.953125 -2.734375 2.734375 1.953125 1.171875 -0.390625 0.390625 2.734375 -2.734375 -1.953125 0.390625 1.171875 -1.953125 -2.734375 -2.734375 1.171875 -1.953125 1.953125 -1.953125 -1.953125 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 1.953125 -1.953125 0.390625 -1.953125 -1.953125 0.390625 -2.734375 1.953125 0.390625 -1.171875 0.390625 0.390625 -1.953125 2.734375 -0.390625 -1.171875 -1.171875 -1.171875 0.390625 1.171875 -2.734375 2.734375 0.390625 2.734375 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="179">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.484 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.969 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.453 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 392.961 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.329 0.308 0.279 0.238 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.214 0.237 0.26 0.283 0.306 0.329 0.352 0.354 0.432 0.531 0.646 0.777 0.926 1.093 1.278 1.481 1.703 1.943 2.201 2.477 2.771 3.084 3.414 3.762 4.127 4.509 4.908 5.323 5.753 6.197 6.653 7.119 7.592 8.07 8.547 9.019 9.478 9.917 10.325 10.693 11.009 11.261 11.439 11.535 11.55 11.547 11.515 11.449 11.354 11.233 11.087 10.921 10.736 10.536 10.323 10.098 9.865 9.625 9.379 9.13 8.878 8.625 8.372 8.12 7.87 7.623 7.378 7.137 6.901 6.669 6.442 6.22 6.003 5.792 5.586 5.386 5.192 5.004 4.821 4.643 4.472 4.306 4.145 3.99 3.84 3.695 3.555 3.42 3.29 3.165 3.043 2.927 2.814 2.706 2.602 2.501 2.405 2.312 2.222 2.136 2.053 1.973 1.896 1.823 1.752 1.683 1.618 1.555 1.494 1.435 1.379 1.325 1.274 1.224 1.176 1.13 1.085 1.043 1.002 0.963 0.925 0.889 0.854 0.82 0.788 0.757 0.728 0.699 0.672 0.645 0.62 0.596 0.572 0.55 0.528 0.507 0.487 0.468 0.45 0.432 0.415 0.399 0.383 0.368 0.354 0.34 0.327 0.314 0.301 0.29 0.278 0.267 0.257 0.247 0.237 0.228 0.219 0.21 0.202

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="11.55" PeakHeight="392.961" Num="5" zHalfNm="341.015" Error="1.636">
-176.645 -13.071 9.544 -2.716 0.38
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.453" Depth="0.154"/>
<TopsideChapman PeakHeight="392.961" PeakDensity="1655117.9" PeakScaleHeight="38.971" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
