THEMIS-A: Electrostatic Analyzer (ESA): Electron/Ion Ground-Calculated Energy Fluxes (ions: 5 eV to 25 keV) electrons: 6 eV to 30 keV) and Moments (density, velocity, pressure, and temperature). Includes FULL, REDUCED and BURST modes. FULL: high angular resolution, low (few min) time resolution. REDUCED: degraded angular resolution, high (approx. 3 sec) time resolution. BURST: high angular resolution, high time resolution; only short bursts of data. Note that angular resolution affects moments since they are obtained integrating over the mode-specific angular distribution. Moment Data Quality flags (0: good data; non-zero flags are totals of values; 1: missing S/C potential, 2: Counter saturation, 4: Solar Wind not in Solar Wind Mode, or Solar Wind Mode, not in Solar Wind, 8: (Reduced Mode only) slow survey mode+flows, 16: electron density Gt 2*ion density, 32: ion density Gt 2*electron density, 64: Spacecraft Maneuver).

THEMIS-A (P5): Electrostatic Analyzer (ESA): Electron/Ion Ground-Calculated Energy Fluxes (ions: 5 eV to 25 keV) electrons: 6 eV to 30 keV) and Moments (density, velocity, pressure, and temperature). Includes FULL, REDUCED and BURST modes. FULL: high angular resolution, low (few min) time resolution. REDUCED: degraded angular resolution, high (approx. 3 sec) time resolution. BURST: high angular resolution, high time resolution; only short bursts of data. Note that angular resolution affects moments since they are obtained integrating over the mode-specific angular distribution.

Instrument description including data modes, products and caveats

Processing history and the THEMIS mission website including TDAS s/w

ESA Full Mode Ion Moment Data Quality (0: Good data, non-zero: Data may not be suitable, see: http://themis.ssl.berkeley.edu/esa_flag.shtml.) 

(Good data only) ESA Full (High Angular Resolution, few minute time res.) Mode, Ion Density 

Notes on diagonalized temperature:.The first eigenvalue  and eigenvector  are the distinguisheable eigenvalue and the major (symmetry) axis, respectively.  .The "degenerate" eigenvalues are sorted such that the 2nd eigenvalue is smaller than the third one.

3d temperatures around magnetic axis (Z) and normal axes (X,Y), where Y is Z direction crosed into Sun direction, and X completes orthogonal system.

-----Ion Symmetry Vector (direction of pressure tensor symmetry (DSL)) 

Ion Symmetry Vector (direction of pressure tensor symmetry (DSL)) 

This is the direction vector of the principal axis of the pressure tensor in DSL coordinates

-----Magnetic Field Vector in DSL (Same time array as Full Ion ESA data) 

Magnetic Field Vector in DSL (Same time array as Full Ion ESA data)

ESA Full Mode, Electron Moment Data Quality (0: Good data, non-zero: Data may not be suitable, see: http://themis.ssl.berkeley.edu/esa_flag.shtml.) 

(Good data only) ESA Full (High Angular Resolution, few minute time res.) Mode, Electron Density

-----Electron Temperature, Field Aligned (Tprp1FA, Tprp2FA, TparFA) 

-----Electron Symmetry Vector (direction of pressure tensor symmetry (DSL)) 

Electron Symmetry Vector (direction of pressure tensor symmetry (DSL)) 

-----Electron Symmetry Angle (between symmetry direction and B) 

-----Magnetic Field Vector in DSL (Same time array as Full Electron ESA data) 

Magnetic Field Vector in DSL (Same time array as Full Electron ESA data) 

ESA Reduced Mode, Ion Moment Data Quality (0: Good data, non-zero: Data may not be suitable, see: http://themis.ssl.berkeley.edu/esa_flag.shtml.) 

(Good data only) ESA Reduced (Low Angular Res., 3-s Time Res.) Mode, Ion Density

-----Magnetic Field Vector in DSL (Same time array as Reduced Ion ESA data) 

Magnetic Field Vector in DSL (Same time array as Reduced Ion ESA data)

ESA Reduced Mode, Electron Moment Data Quality (0: Good data, non-zero: Data may not be suitable, see: http://themis.ssl.berkeley.edu/esa_flag.shtml.) 

(Good data only) ESA Reduced (Low Angular Res., 3-s Time Res.) Mode, Electron Density

ESA Reduced (Low Angular Res., 3-s Time Res.) Mode, Electron Density

-----SC Potential (Same time array as Reduced Electron ESA data) 

-----Electron Temperature, Field Aligned (Tprp1FA, Tprp2FA, TparFA)

-----Magnetic Field Vector in DSL (Same time array as Reduced Electron ESA data) 

Magnetic Field Vector in DSL (Same time array as Reduced Electron ESA data)

-----Electron survey mode, controls angle and energy binning, and time resolution, values 0 to 4 

ESA Burst Mode, Ion Moment Data Quality (0: Good data, non-zero: Data may not be suitable, see: http://themis.ssl.berkeley.edu/esa_flag.shtml.) 

(Good data only) ESA Burst (High Time and Angular Resolution) Mode, Ion Density

-----Ion Symmetry Vector (direction of pressure tensor symmetry (DSL))  

-----Magnetic Field Vector in DSL (Same time array as Burst Ion ESA data) 

Magnetic Field Vector in DSL (Same time array as Burst Ion ESA data)

-----Ion survey mode, controls angle and energy binning, and time resolution, values of 0 to 8  

ESA Burst Mode, Electron Moment Data Quality (0: Good data, non-zero: Data may not be suitable, see: http://themis.ssl.berkeley.edu/esa_flag.shtml.) 

(Good data only) ESA Burst (High Time and Angular Resolution) Mode, Electron Density

-----Electron Temperature, Field Aligned (Tprp1FA, Tprp2FA, TparFA)  

-----Magnetic Field Vector in DSL (Same time array as Burst Electron ESA data) 

Magnetic Field Vector in DSL (Same time array as Burst Electron ESA data)

(All qualities data) ESA Full (High Angular Resolution, few minute time res.) Mode, Ion Density

Ion Diagonalized Temperature (Tprp1, Tprp2, Tpar)(all qualities)

Temperature, Field Aligned (TprpFA1, TprpFA2, TparFA)(all qualities)

Ion Symmetry Vector (direction of pressure tensor symmetry (DSL))(all qualities)

-----Magnetic Field Vector in DSL (Same time array as Full Ion ESA data)

Magnetic Field Vector in DSL (Same time array as Full Ion ESA data)(all qualities)

tha_peif_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample

Unleaped seconds. Sample start and end time can be calculated from  tha_peif_delta_time (sample duration).

-----Ion survey mode, controls angle and energy binning, and time resolution, values of 0 to 8

(All qualities data) ESA Full (High Angular Resolution, few minute time res.) Mode, Electron Density

Electron Diagonalized Temperature (Tprp1, Tprp2, Tpar)(all qualities)

Electron Temperature, Field Aligned (Tprp1FA, Tprp2FA, TparFA)(all qualities)

Electron Symmetry Vector (direction of pressure tensor symmetry (DSL))(all qualities) 

-----Magnetic Field Vector in DSL (Same time array as Full Electron ESA data)

Magnetic Field Vector in DSL (Same time array as Full Electron ESA data)(all qualities)

tha_peef_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample

Unleaped seconds. Sample start and end time can be calculated from  tha_peef_delta_time (sample duration).

-----Electron survey mode, controls angle and energy binning, and time resolution, values 0 to 4

(All qualities data) ESA Reduced (Low Angular Res., 3-s Time Res.) Mode, Ion Density

Temperature, Field Aligned (Tprp1FA, Tprp2FA, TparFA)(all qualities)

Ion Symmetry Vector (direction of pressure tensor symmetry (DSL))(all qualities) 

-----Magnetic Field Vector in DSL (Same time array as Reduced Ion ESA data)

Magnetic Field Vector in DSL (Same time array as Reduced Ion ESA data)(all qualities)

tha_peir_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample

Unleaped seconds. Sample start and end time can be calculated from  tha_peir_delta_time (sample duration).

-----Ion survey mode, controls angle and energy binning, and time resolution, values 0 to 8

(All qualities data) ESA Reduced (Low Angular Res., 3-s Time Res.) Mode, Electron Density

ESA Reduced (Low Angular Res., 3-s Time Res.) Mode, Electron Density(all qualities)

-----SC Potential (Same time array as Reduced Electron ESA data)

-----Magnetic Field Vector in DSL (Same time array as Reduced Electron ESA data)

Magnetic Field Vector in DSL (Same time array as Reduced Electron ESA data)(all qualities)

tha_peer_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample

Unleaped seconds. Sample start and end time can be calculated from  tha_peer_delta_time (sample duration).

(All qualities data) ESA Burst (High Time and Angular Resolution) Mode, Ion Density

-----Magnetic Field Vector in DSL (Same time array as Burst Ion ESA data)

Magnetic Field Vector in DSL (Same time array as Burst Ion ESA data)(all qualities)

tha_peib_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample

Unleaped seconds. Sample start and end time can be calculated from  tha_peib_delta_time (sample duration).

(All qualities data) ESA Burst (High Time and Angular Resolution) Mode, Electron Density

Electron Symmetry Vector (direction of pressure tensor symmetry (DSL))(all qualities)

-----Magnetic Field Vector in DSL (Same time array as Burst Electron ESA data)

Magnetic Field Vector in DSL (Same time array as Burst Electron ESA data)(all qualities)

tha_peeb_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample

Unleaped seconds. Sample start and end time can be calculated from  tha_peeb_delta_time (sample duration).

If None, then the potential was set to 0.Else the potential was calculated using EFI data.

ESA electron solar wind mode flag; 0: Not in Solar Wind mode, 1: in Solar Wind mode

ESA ion solar wind mode flag; 0: Not in Solar Wind mode, 1: in Solar Wind mode


  status_code: 200
  from_cache:  True
  revalidated: True
  is_expired:  True
  timeout:     30
  max_retries: 5
  user headers: None
  cached_session_options: None
  cache_key:   8e2bc8f3b8901369
  cache_file:  ./data/CachedSession/master/8e2bc8f3b8901369.json
  cache_file_stat: 
    st_atime: Mon, 05 May 2025 02:10:29.204894 GMT
    st_mtime: Mon, 05 May 2025 02:10:29.492897 GMT
    st_ctime: Mon, 05 May 2025 02:10:29.492897 GMT
  Request Headers:
    Accept: */*
    Accept-Encoding: gzip, deflate
    Connection: keep-alive
    If-Modified-Since: Tue, 04 Mar 2025 22:06:27 GMT
    If-None-Match: "43739-62f8b7c006c51"
    User-Agent: python-requests/2.25.1
  Response Headers:
    Accept-Ranges: bytes
    Access-Control-Allow-Methods: GET
    Access-Control-Allow-Origin: *
    Connection: Keep-Alive
    Content-Length: 302073
    Content-Security-Policy: frame-ancestors 'self' *.gsfc.nasa.gov;
    Content-Type: application/json
    Date: Mon, 05 May 2025 02:10:29 GMT
    ETag: "4431e-6315a6b2fbaee"
    Keep-Alive: timeout=5, max=100
    Last-Modified: Thu, 27 Mar 2025 22:24:35 GMT
    Server: Apache
    Strict-Transport-Security: max-age=31536000; includeSubDomains