I analyze Mount's published spectrum and measure:
Drift rate ~ -1.4E-3 MHz/s at 21 MHz on 130308 0130 UTC
Relative drift rate = -6.7E-5 per second
Relative ionospheric electron concentration change rate ~ -1.3E-4 per second ~ - 0.78 % per minute
More about ionospheric modulations at:
http://herrero-radio-astronomy.blogspot.com/search/label/Ionospheric%20Modulations
Many thanks to Andy for his publication.
Drift rate ~ -1.4E-3 MHz/s at 21 MHz on 130308 0130 UTC
Relative drift rate = -6.7E-5 per second
Relative ionospheric electron concentration change rate ~ -1.3E-4 per second ~ - 0.78 % per minute
More about ionospheric modulations at:
http://herrero-radio-
Many thanks to Andy for his publication.