THEMIS-C Level 1 Probe State Data

The L1 STATE files contain the following data, sampled at one-minute intervals:

* probe position and velocity in GEI, GSE, and GSM coordinates;
* flags to indicate regions of interest and maneuver status;
* RA and declination of spin axis;
* spin period and spin phase;
* spin model parameters for high-precision interpolation of spin phase between one-minute data points.

Version number indicates data source as follows:

* V00: predicted ephemeris and attitude, no spin period or spin phase;
* V01: predicted ephemeris and attitude, spin period and spin phase derived from probe telemetry;
* V02: predicted attitude, definitive ephemeris from magnetometer and Doppler tracking data;
* V03: corrected attitude and spin phase derived from fully calibrated magnetometer data. (added science attitude determination using perigee data post-processing).

Produced by Mission Ops, Science Ops and Science Team.

L1级状态文件包含以下以一分钟为采样间隔的数据：
* 大地赤道惯性坐标系（Geocentric Equatorial Inertial, GEI）、地心太阳黄道坐标系（Geocentric Solar Ecliptic, GSE）以及地心太阳磁层坐标系（Geocentric Solar Magnetospheric, GSM）下的探测器位置与速度；
* 用于标记感兴趣区域与机动状态的标志位；
* 自旋轴的赤经（Right Ascension, RA）与赤纬（Declination）；
* 自旋周期与自旋相位；
* 用于在一分钟采样数据点之间高精度插值自旋相位的自旋模型参数。

版本号与对应数据来源说明如下：
* V00：仅包含预测星历与姿态数据，未提供自旋周期及自旋相位；
* V01：包含预测星历与姿态数据，自旋周期及自旋相位由探测器遥测数据推导获得；
* V02：包含预测姿态数据，确定式星历源自磁强计与多普勒跟踪观测数据；
* V03：基于完全校准后的磁强计数据推导得到修正后的姿态与自旋相位（新增了利用近地点数据后处理的科学姿态确定方法）。

本数据集由任务运营团队、科学运营团队及科学工作组联合产出。