Atmospheric and ionospheric errors are among the primary sources of errors that affect GNSS receivers. These errors can become more pronounced during periods of high ionospheric activity.
These errors can be corrected using a dedicated correction service (i.e., PointPerfect). However, It is important to note that such services are typically high-end and high-accuracy solutions, and their cost may not be ideal for low-power or low-cost solutions like AssistNow would.
For recommendations on how to mitigate ionospheric errors, please see: How to mitigate ionospheric positioning errors on a GNSS receiver using AssistNow?
To review the latest global ionospheric activity please see: Where can I review global ionospheric activity?