USE OF A FLASH MEMORY CARD FOR LONG-TERM GEOMAGNETIC DATA RECORDING

A compact data recorder using nonvolatile flash memory cards has been developed and is available for use in long-term and unmanned magnetome ter data acquisition systems. A recently available flash memory card t hat consists of semiconductor memories is suitable for unmanned long-t erm recording in remote places difficult to visit frequently. This rec order collects 200 days of three-component 3-s-sampling geomagnetic da ta by using five pieces of a commonly sold 4-MB flash memory card and can be used for longer-term recording by using larger-capacity cards. Processing data from the cards to standard-format computer files is qu ick and smart, and no data are lost because of reading errors caused b y physical damage.