This page summarizes information about the selected resource and its origin based on SPASE metadata.
SPASE version 2.2.0
The PO_H1_PWI CDF files contain spectral densities of magnetic and electric field measurements from the Sweep Frequency Receiver-A and B. These files also contain correlation, electron cyclotron frequency, upper hybrid frequency and electron number density data.
A full frequency sweep for the SFR takes about 33 seconds. From about 12.5 kHz to 800 kHz a full frequency spectrum can be obtained every 2.4 sec in the log mode.
There are 224 SFR frequency bands, logarithmically spaced. When SFR_MODE is Linear, the 448 linear frequency bands are mapped to 224 logarithmic bands.
The Polar Sweep Frequency Receiver-A (SFR-A) made use of either the Eu (130 m, spin-plane) or Ez (14 m, spin axis) two-sphere electric dipole antennas. Between March 25, 1996 and May 26, 1996, the Eu antenna was the default antenna, from May 27, 1996 through February 9, 1997 the Ez antenna was used and from February 10, 1997 until September 17, 1997 the SFR-A returned to using the Eu antenna. The SFR-A receiver spanned the frequency range from 26 Hz to 808 kHz in 5 bands: 26-200 Hz, 0.2 - 1.6 kHz, 1.7 - 12.6 kHz, 13-100 kHz, 100-808 kHz.
The Polar PWI Sweep Frequency Receiver-B (SFR-B) collected data from March 1996 to September 1997. The SFR-B used the magnetic loop antenna (mounted on a 6m boom and oriented parallel to the Eu antenna). The SFR-B receiver spanned the frequency range from 26 Hz to 808 kHz in 5 bands: 26-200 Hz, 0.2 - 1.6 kHz, 1.7 - 12.6 kHz, 13-100 kHz, 100-808 kHz.
A Polar PWI page is maintained at the University of Iowa with descriptions of interpretation issues, user's guides, data availability tables, a form for creating summary plots and access to pregenerated dynamic spectrograms.
Descriptions of PWI receiver and antenna modes.
Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Polar PWI instrument Principal Investigator Don Gurnett.
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Prof. Donald A. Gurnett |
| 2. | General contact | Dr. J. Douglas Menietti |
FTP access to repository of Polar PWI SFR A and B CDFs at NASA CDAWeb.Name of the data resource: PO_H1_PWI
Repository of Polar PWI data in CDF format at NASA CDAWeb, accessible via web interface. Name of the data resource: PO_H1_PWI.
Users please acknowledge Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center and Polar PWI instrument Principal Investigator Don Gurnett.
A full frequency sweep for the SFR takes about 33 seconds. From about 12.5 kHz to 800 kHz a full frequency spectrum can be obtained every 2.4 sec in the log mode.
There are 224 SFR frequency bands, logarithmically spaced. When SFR_MODE is Linear, the 448 linear frequency bands are mapped to 224 logarithmic bands.
Time, begin time of SFR 1 spectrum
Antenna (SFRA) 0=Eu, 1=Ez, 2=L, 3=Bz
Antenna (SFRB) 0=Eu, 1=Ev, 2=Ez, 3=L
SFR Mode (0 = Log, 1 = Linear). Linear mode data is mapped to Log Mode
Number of SFR 2 Records. 3217
Number of SFR 3 Records. 6432
Number of SFR 4 and 5 Records. 22518
Number of fUHR/Ne Records. 148
Number of Fce Records. 14065
Start Time of SFR4 and SFR 5 Spectra
Frequencies, 64 (104069.50-807814.25) Hz. 104069.5 106212.88 110512.75 114830.5 116996.0 121340.25 125702.5 130082.75 134481.25 138898.25 143333.25 147787.0 152259.5 156750.5 163522.5 168061.0 174904.75 179491.5 186408.0 191043.75 198034.25 205069.75 212150.5 219277.25 226450.25 233670.0 240936.75 248251.25 258079.0 265506.5 275486.75 283030.0 293166.0 303393.0 313712.0 324124.25 334631.0 345233.75 355933.5 369477.0 380370.25 394167.75 405321.75 419411.75 433668.75 448095.25 462694.5 477470.0 495437.0 510610.5 525970.5 544653.5 563616.0 582864.25 602405.0 622245.0 642390.75 662949.75 683629.25 708287.25 729787.5 755308.5 781312.5 807814.25
Frequencies, 64 (13008.69-100976.78) Hz. 13008.69 13276.61 13814.09 14353.81 14624.5 15167.53 15712.31 16260.34 16810.16 17362.28 17916.66 18473.38 19032.44 19593.81 20440.31 21007.63 21863.09 22436.44 23301.0 23880.47 24754.28 25633.72 26518.81 27409.66 28306.28 29208.75 30117.09 31031.41 32259.88 33188.31 34435.84 35378.75 36645.75 37924.13 39214.0 40515.53 41828.88 43154.22 44491.69 46180.88 47546.28 49270.97 50665.22 52426.47 54208.59 56011.91 57836.81 59683.75 61929.63 63826.31 65746.31 68081.69 70452.0 72858.03 75300.63 77780.63 80298.84 82856.22 85453.66 88535.91 91223.44 94413.53 97664.06 100976.78
Start Time of SFR 3 Spectrum
Frequencies, 32 (1659.58-12622.10) Hz. 1659.58 1794.23 1895.94 2032.54 2170.29 2309.17 2449.23 2625.95 2804.55 2985.06 3204.21 3426.21 3651.09 3878.93 4148.54 4422.34 4740.52 5064.44 5394.28 5772.61 6158.87 6553.31 7001.49 7460.47 7978.29 8510.21 9107.25 9722.58 10357.03 11066.99 11801.69 12622.1
Start Time of SFR2 Spectrum
Frequencies, 32 (207.45-1577.76) Hz. 207.45 224.28 236.99 254.07 271.29 288.65 306.15 328.24 350.57 373.13 400.53 428.28 456.39 484.87 518.57 552.79 592.56 633.06 674.28 721.58 769.86 819.16 875.19 932.56 997.29 1063.78 1138.41 1215.32 1294.63 1383.37 1475.21 1577.76
Frequencies, 32 (26.77-192.86) Hz. 26.77 28.82 30.37 32.44 34.54 36.65 38.78 41.47 44.18 46.93 50.26 53.63 57.05 60.51 64.61 68.76 73.6 78.51 83.52 89.26 95.11 101.09 107.89 114.84 122.68 130.73 139.77 149.07 158.66 169.39 180.48 192.86
Spectral Density of Elec. Field at 64 freq., 104069.50-807814.25 Hz (SFR5 A)
Spectral Density of Elec. Field at 64 freq., 13008.69-100976.78 Hz (SFR4 A)
Spectral Density of Elec. Field at 32 freq., 1659.58-12622.10 Hz (SFR3 A)
Spectral Density of Elec. Field at 32 freq., 207.45-1577.76 Hz (SFR2 A)
Spectal Density of Elec. Field at 32 freq., 26.77-192.86 Hz (SFR1 A)
Spectral Density of Mag. Field at 64 freq., 104069.50-807814.25 Hz (SFR5 B)
Spectral Density of Mag. Field at 64 freq., 13008.69-100976.78 Hz (SFR4 B)
Spectral Density of Mag. Field at 32 freq., 1659.58-12622.10 Hz (SFR3 B)
Spectral Density of Mag. Field at 32 freq., 207.45-1577.76 Hz (SFR2 B)
Spectral Density of Mag. Field at 32 freq., 26.77-192.86 Hz (SFR1 B)
Phase Angle at 64 freq., 104069.50-807814.25 Hz (SFR5 Phase)
Phase Angle at 64 freq., 13008.69-100976.78 Hz (SFR4 Phase)
Phase Angle at 32 freq., 1659.58-12622.10 Hz (SFR3 Phase)
Phase Angle at 32 freq., 207.45-1577.76 Hz (SFR2 Phase)
Phase Angle at 32 freq., 26.77-192.86 Hz (SFR1 Phase)
Correlation at 64 freq., 104069.50-807814.25 Hz (SFR4 Corr)
Correlation at 64 freq., 13008.69-100976.78 Hz (SFR4 Corr)
Correlation at 32 freq., 1659.58-12622.10 Hz (SFR3 Corr)
Correlation at 32 freq., 207.45-1577.76 Hz (SFR2 Corr)
Correlation at 32 freq., 26.77-192.86 Hz (SFR1 Corr)
Time of Fce
Electron Cyclotron Frequency Fce
Time of fUHR/Ne
Upper Hybrid Resonance Frequency fUHR
Electron Number Density Ne
SPASE version 2.0.0
The objectives of this investigation are to measure the spectrum, amplitude, and wave vector characteristics for naturally occurring electromagnetic and electrostatic plasma waves along the ISTP/POLAR trajectory for frequency ranges of 1 Hz to 400 kHz (magnetic), 1 Hz to 3.2 MHz (electric), and 1 Hz to 16 kHz (density fluctuations). The same characteristics are also measured for electromagnetic and electrostatic plasma waves resulting from ground-based or Shuttle-based active wave, particle, and chemical injection experiments. A unique feature of this instrument is the capability to recognize the presence of a desired phenomenon based on onboard microprocessor algorithms, and to capture the waveforms for six wave fields simultaneously. These waveforms provide simultaneous estimates for the electromagnetic wave normal, polarization, and Poynting vectors or for the electrostatic propagation and polarization vectors after ground processing. PWI experienced an undervoltage condition in its 5-volt power supply on September 16, 1997. This power supply was used to operate the digital processing units (DPU) of the instrument. Without full power, the DPUs are unable to operate and no backup power supply was incorporated into the instrument. Thus, no PWI data have been obtained by the PWI instrument since that date. Magnetic searchcoil data are still being obtained by the EFI instrument in its burst mode as long as PWI's main instrument power remains on (the default as of November 18, 1997). There is nothing that the PWI team can do to clear this undervoltage condition. Unless the condition clears itself, the PWI data set has a finite time span of March 25, 1996 through September 16, 1997.
Information about the Plasma Waves Investigation (PWI) experiment on the Polar mission.
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Prof. Donald A. Gurnett |
SPASE version 2.2.0
POLAR is one of four spacecraft in the Global Geospace Science (GGS) program. These are among the six spacecraft in the International Solar Terrestrial Physics (ISTP) program. POLAR provides multi-wavelength imaging of the aurora, measuring plasma entry into the polar magnetosphere and geomagnetic tail, the flow of plasmas to and from the ionosphere, and the deposition of particle energy in the ionosphere and upper atmosphere. POLAR has on-board propulsion systems and a design lifetime of three to five years, with redundant subsystems. POLAR is cylindrical, approximately 2.8 m in diameter by 1.25 m high (plus 1.25 m for its two despun platforms), with body-mounted solar cells, weighs 1250 kg and uses 333 W of power. The spin rate is 10 rpm around an axis approximately normal to the orbital plane. It has long wire spin-plane antennas, inertial booms, and spin-plane appendages to support sensors. POLAR has two despun gimbaled instrument platforms, and booms are deployed along both Z axes. Data are stored using on-board tape recorders and are relayed to the Deep Space Network at 600 kbps maximum (250 kbps nominal) although the average real-time data rate for POLAR is 41.6 kbps. POLAR has a 22.6-h polar orbit (90 deg inclination), with perigee and apogee of 11,500 and 57,000 km. Polar was launched to observe the polar magnetosphere and, as its orbit has precessed with time, has observed the equatorial inner magnetosphere and is now carrying out an extended period of southern hemisphere coverage. Details on the POLAR mission and instrumentation are provided in Space Science Reviews (Vol. 71, Nos. 1-4, 1995) and reprinted in The Global Geospace Mission, edited by C. T. Russell (Kluwer, 1995).
Web site of NASA Polar Mission, including overview, data products, FTP to the data, publications, educational outreach, orbits, instrument descriptions, contacts, news archive, and ISTP archive.
Information about the Polar mission
| Role | Person | |
|---|---|---|
| 1. | Project scientist | Dr. John B. Sigwarth |
SPASE version 2.2.0
SPASE version 2.2.0
SPASE version 2.2.0
SPASE version 2.2.0
SPASE version 2.2.0
Coordinated Data Analysis Web (CDAWeb) supports not only interactive plotting of variables from multiple instruments on multiple investigations simultaneously on arbitrary, user-defined time-scales. It also supports data retrieval in various formats using its interactive web interface or ftp service.
Coordinated Data Analysis Web (CDAWeb) home page at Space Physics Data Facility of the NASA Goddard Space Flight Center.
| Role | Person | |
|---|---|---|
| 1. | Project scientist | Dr. Robert E. McGuire |