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MMS 2 Digital Signal Processor (DSP) Search Coil Magnetometer (SCM), Magnetic Field Power Spectral Density, Level 2 (L2), Slow Mode, 16 s Data

The MMS magnetic field power spectral density (BPSD) is computed onboard by the Digital Signal Processor (DSP). The fast Fourier transform (FFT) calculation is performed on a digitized version of analog signals from the Search Coil Magnetometer (SCM) in the SCM123 coordinate system (scm1 = - x sensor; scm2 = -z sensor; scm3 = -y sensor). This data product is computed in space from individual components that are not synchronized to the 1 second pulse. Therefore, the timing between channels can be inaccurate by a fraction of a second. The samples times are interval start times taken from the x component. The spectra are calculated via a 1024-point FFT algorithm on piecewise continuous sets of waveform data. Nine signals can be processed simultaneously. Six of the twelve DC-coupled E, DC-coupled V, or SCM signals (16384 samples/s) are selected for spectral processing at 100% duty cycle. In addition, the three AC-coupled signals (262,144 kS/s) each can be processed at 6.25% duty cycle. Each of the nine signals has 16, 1024-point FFT operations every second; the field-programmable gate array (FPGA) performs 144 FFTs per second. The FFT is performed by an arithmetic logic unit (ALU), which is controlled by a state machine. Both are hard-coded into the FPGA. The operation starts by applying a 1024-point Hanning window onto a waveform. Next, an FFT is implemented. The FFT is broken into a series of "butterfly" operations performed by the ALU. The result has real and imaginary data. Power spectra are calculated by taking the sum of squares of real and imaginary values (the ALU includes a multiplier), which produces a power spectrum with 512 frequency bins. The frequency bins are then combined to give pseudo-logarithmic frequency spacing (del f)/f. The spectra are reduced to 88 frequency bins with (del f)/f between 6% and 12% when possible. Narrow-band emissions can be fit to an accuracy of (del f)/f ~3%, allowing for an accurate determination of plasma density. The spectra can be averaged in time. The fastest reporting rate of any signal is 16 spectra per second. Reporting rates can be as slow a one spectra every 16 s (averaging 256 spectra). The averaging process has 48-bit accuracy to maximize the dynamic range. The amplitudes undergo a pseudo-logarithmic compression to an 8-bit number representing over 120 dB of dynamic range at ~5% precision.

Thule Air Base (TAB) Ground-based Vector Magnetic Field (L2) 1.0 min Data

Thule Air Base, Greenland, Ground-based Vector Magnetic Field Level 2 Data, 1.0 min Time Resolution, Station Code: (TAB), Station Location: (GEO Latitude 76.5, Longitude 291.2), Norwegian Mag. Network

MMS 4 Electric Double Probe (EDP) Axial Double Probe, Spin Plane Double Probe (ADP-SDP) Three-Dimensional HMFE Electric Field, Level 2 (L2), Burst Mode, 0.01525878906 ms Data

Electric Double Probe, Three-Dimensional HMFE Electric Field, Level 2, Burst Mode, Level 1B AC Electric Field Data

Pioneer Venus Orbiter (PVO) hourly merged magnetic field and plasma data

This is an hourly resolution, merged magnetic field and plasma data set created at NSSDC for COHOWeb. Magnetic field vectors and plasma flow direction angles are given in RTN coordinates. Spacecraft position data are given in Heliographic inertial (HGI coordinates).

Donna (DON) Ground-based Vector Magnetic Field (L2) 1.0 min Data

Donna, Norway, Ground-based Vector Magnetic Field Level 2 Data, 1.0 min Time Resolution, Station Code: (DON), Station Location: (GEO Latitude 66.1, Longitude 12.5), TGO Network

Nord (NRD) Ground-based Vector Magnetic Field (L2) 20.0 s Data

Nord, Greenland, Ground-based Vector Magnetic Field Level 2 Data, 20.0 s Time Resolution, Station Code: (NRD), Station Location: (GEO Latitude 81.6, Longitude 343.3), DTU Network

Savissivik (SVS) Ground-based Vector Magnetic Field (L2) 20.0 s Data

Savissivik, Greenland, Ground-based Vector Magnetic Field Level 2 Data, 20.0 s Time Resolution, Station Code: (SVS), Station Location: (GEO Latitude 76.0, Longitude 294.9), DTU Network

Vize Island (VIZ) Ground-based Vector Magnetic Field (L2) 1.0 min Data

Vize Island, Russia, Ground-based Vector Magnetic Field Level 2 Data, 1.0 min Time Resolution, Station Code: (VIZ), Station Location: (GEO Latitude 79.3, Longitude 76.5), AARI Network

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CALIPSO Wide Field Camera (WFC) L1B Science 125 m Native Science Data V3-02

Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) was launched on April 28, 2006 to study the impact of clouds and aerosols on the Earth’s radiation budget and climate. It flies in formation with five other satellites in the international “A-Train” (PDF) constellation for coincident Earth observations. The CALIPSO satellite comprises three instruments, the Cloud-Aerosol LIdar with Orthogonal Polarization (CALIOP), the Imaging Infrared Radiometer (IIR), and the Wide Field Camera (WFC). CALIPSO is a joint satellite mission between NASA and the French Agency, CNES. These data consist 5 km aerosol layer data.

MMS 3 Electric Double Probe (EDP) Axial Double Probe, Spin Plane Double Probe (ADP-SDP) Electric Double Probe, High-Frequency Electric Field Spectra, Level 2 (L2), Survey Mode, 16 s Data

Electric Double Probe, High-Frequency AC Electric Field Spectra, Level 2, Survey Data, Level 1B AC Electric Field Data

Barentsburg (BBG) Ground-based Vector Magnetic Field (L2) 1.0 min Data

Barentsburg, Russia, Ground-based Vector Magnetic Field Level 2 Data, 1.0 min Time Resolution, Station Code: (BBG), Station Location: (GEO Latitude 67.9, Longitude 306.4), AARI Network

Hankasalmi (HAN) Ground-based Vector Magnetic Field (L2) 10.0 s Data

Hankasalmi, Finland, Ground-based Vector Magnetic Field Level 2 Data, 10.0 s Time Resolution, Station Code: (HAN), Station Location: (GEO Latitude 62.3, Longitude 26.6), IMAGE Network

MMS 2 Electric Double Probe (EDP) Axial Double Probe, Spin Plane Double Probe (ADP-SDP) Three-Dimensional HMFE Electric Field, Level 2 (L2), Burst Mode, 0.01525878906 ms Data

Electric Double Probe, Three-Dimensional HMFE Electric Field, Level 2, Burst Mode, Level 1B AC Electric Field Data

Pueblo (PBLO) Ground-based Vector Magnetic Field (L2) 0.5 s Data

Pueblo, CO, Ground-based Vector Magnetic Field Level 2 Data, 0.5 s Time Resolution, Station Code: (PBLO), Station Location: (GEO Latitude 38.3, Longitude 255.4), THEMIS GBO Network

Ittoqqortoormiit (SCO) Ground-based Vector Magnetic Field (L2) 1.0 min Data

Ittoqqortoormiit, Greenland, Ground-based Vector Magnetic Field Level 2 Data, 1.0 min Time Resolution, Station Code: (SCO), Station Location: (GEO Latitude 70.4, Longitude 338.0), DTU Network

MMS 1 Electric Double Probe (EDP) Axial Double Probe, Spin Plane Double Probe (ADP-SDP) Three-Dimensional HMFE Electric Field, Level 2 (L2), Burst Mode, 0.01525878906 ms Data

Electric Double Probe, Three-Dimensional HMFE Electric Field, Level 2, Burst Mode, Level 1B AC Electric Field Data

Stanford (STFD) Ground-based Vector Magnetic Field (L2) 0.5 s Data

Stanford, CA, Ground-based Vector Magnetic Field Level 2 Data, 0.5 s Time Resolution, Station Code: (STFD), Station Location: (GEO Latitude 37.4, Longitude 237.8), THEMIS GBO Network

Homer (HOMR) Ground-based Vector Magnetic Field (L2) 0.5 s Data

Homer, AK, Ground-based Vector Magnetic Field Level 2 Data, 0.5 s Time Resolution, Station Code: (HOMR), Station Location: (GEO Latitude 59.7, Longitude 209.5), University of Alaska Network

PENGUIn-4 (PG4) Ground-based Vector Magnetic Field (L2) 1.0 s Data

PENGUIn-4, Antarctica, Ground-based Vector Magnetic Field Level 2 Data, 1.0 s Time Resolution, Station Code: (PG4), Station Location: (GEO Latitude -83.3, Longitude 12.3), Antarctic Network

ARTEMIS P1 field-plasma merged data, near moon

This data set contains 96s and 384s resolution magnetic field and plasma ion data from the THEMIS-B ESA and FGM instruments during the near moon (ARTEMIS) phase of the spacecraft life (>~September 1, 2010). The data are at each resolution for several mutually exclusive, contiguous hours during most days. The field-plasma-merged data set was created at GSFC/Space Physics Data Facility (SPDF) as part of the LunaSOX effort, from CDAWeb data sets THB_L2_ESA (good quality, high angular resolution mode only) and THB_L2_FGM. Geocentric spacecraft and moon orbit data from SSCWeb were used to add geocentric and selenocentric spacecraft position data to the merged data set records.