# COSMIC-2 Mission Summary at Three Years in Orbit
## 3 Requirements, Products, and Performance
### Current Products  
The currently available COSMIC-2 products and requirements are summarized in Table 5. The COSMIC-2 data user communities receiving the products may be divided into operational and research categories. Operational data products are delivered to NOAA's Environmental Modeling Center (EMC) and Space Weather Prediction Center (SWPC), US Air Force 557h Weather Wing, US Navy Fleet Numerical Meteorology and Oceanography Center, Taiwan's CWB, ECMWF, and other operational centers worldwide via the WMO Global Telecommunication System [28]. Operational assimilation of COSMIC-2 neutral atmosphere products began December 2019 at FNMOC, March 2020 at ECMWF, and May 2020 at EMC [5; 6]. Per the program's data policy, daily near real-time data and products are published about 2 h after the close of each day. The number of neutral atmosphere profiles per day passing quality control (QC) in 2022 is shown in Figure 2. It is clear the mission is reliably exceeding the 4000/day requirement (should be met 91.5% of the time). Occasionally significant drops occurred for operational reasons (e.g., ground station outages). There is also a trend towards lower counts during March-April, due to increased ground processing QC check failures. The cause of a portion (approximately 40%) of this drop has been determined and will be addressed in TGRS flight software v4.4.2. The causes of other QC failure increases are under investigation. Since May 2022, the post-QC counts have improved. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Type** & **File Format** & **Comments** \\ \hline Level 0 data & trgLv0 & Decoder software available on \\  & & CDAAC data site \\ Satellite attitude & leoAtt & \\ RO antenna observations & opnGns & \\ POD antenna observations & podCrx (RINEX) & Ref. [31] \\ POD estimates & leoOrb (SP3) & Ref. [32] \\ High rate RO observations & opnGns (binary) & \\ Excess phase & conPhs & Nav bits removed \\ Neutral atm. retrieval & atmPrf & \\ Neutral atm. model profiles & avnPrf, echPrf & Derived from Global Forecast \\  & & \\
1D var retrieval & wetPf2 & \\ Neutral atm. BUFR & BUFR (binary) & Ref. [33] \\ Electron density profiles & ionPrf & \\ Absolute TEC & podTc2 & \\ Scintillation amplitude and RFfindices & scn1c2 & Onboard computed \\  & & amplitude index \\ High rate POD antenna observations & scnPhs & \\  & & \\   for scintillation monitoring & scnLv2 & Ground computed from high \\  & & rate observations \\  & & \\   IVM in-situ plasma density, & & \\   composition, temp & ivmLv2 & \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Available data products. Unless otherwise noted, file formats are NetCDF and documented at CDAAC and CWB [29; 30]. A key feature of the TGRS is a pair of high-gain phased array antennas for RO tracking. This enables higher SNR RO profiles than any other mission to date. Figure 3 shows the daily max, mean, and median SNR in the range of 60-80 km height of straight line (HSL). The average of the daily mean and max SNR is 1277 V/V and 2437 V/V, respectively. For comparison, the mean SNR achieved by COSMIC-1 is approximately 700 V/V [34]. Higher SNR mainly enables the receiver to track signals lower into the troposphere. In fact, COSMIC-2 is configured to track setting profiles to \(-\)350 km HSL which enables the reliable detection of tropospheric ducts. In future, detected ducts may be flagged in order to provide more information to data users [1,34]. TGRS ionosphere product quantity is measured as the number of daily TEC arcs and occultations. A TEC arc and occultation are defined as the portion of a track above and below the spacecraft local level, respectively. An occultation must span from 90 km straight-line altitude to spacecraft altitude in order to be counted. A key requirement related to TEC is that the daily sum of the arcs and occultations should be at least 12,000. Figure 4 shows TEC arcs, occultations, and their sum in 2022. The arc plus occultation requirement has not been consistently met since launch.