Mars EUV proxy
This page contains information and files related to the determination of a
proxy for the EUV flux at Mars, determined by extrapolating measurements of
the F10.7 flux from Earth to Mars. Contact Dave Mitchell (mitchell at ssl
dot berkeley dot edu) for information not found on this webpage, or Dave
Brain (brain at ssl dot berkeley dot edu). But Dave Mitchell is the expert.
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EUV proxy determination
The F10.7 radio flux measured at Earth is used to estimate the solar EUV
flux from 2-100 nm at Earth. These values are then scaled to Mars'
orbital distance from the Sun using a 1/r2 scaling, and
time-shifted to account for the solar longitude difference between the
Earth and Sun. A 26-day solar rotation rate is assumed.
The technique was developed by Dave Mitchell and used in Mitchell et al.,
JGR 106(E10), p.23419-23427, 2001.
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Important Caveats
- The EUV proxy relies on a number of assumptions, not least of
which is extrapolation and time-shifting of observations from
Earth to Mars. Please use appropriate caution when using the
information on this page. We favor use of the EUV proxy for
statistical studies (e.g. comparing observations made during high
EUV time periods to low EUV time periods), rather than specific
case studies.
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EUV proxy information for download
Descriptions of the files follow the table.
Text File (Earth)
Columns:
- Time stamp
- EUV flux at Earth for each time stamp,
in solar flux units (1 sfu = 10-22 W/m2-Hz =
104 Jy)
Text File (Mars)
Columns:
- Time stamp
- EUV flux at Mars for each time stamp,
in solar flux units (1 sfu = 10-22 W/m2-Hz =
104 Jy)
- Time required for the solar longitude of
Earth to rotate to Mars, in days.
- Mars' heliocentric distance, in AU.
IDL save/restore file
Arrays:
earthtime: timestamps for EUV flux at Earth
earthflux: EUV flux at Earth for each time stamp,
in solar flux units (1 sfu = 10-22 W/m2-Hz =
104 Jy)
marstime: timestamps for EUV flux at Mars
marsflux: EUV flux at Mars for each time stamp,
in solar flux units (1 sfu = 10-22 W/m2-Hz =
104 Jy)
marsdt: Time required for the solar longitude of
Earth to rotate to Mars, in days.
marsdr: Mars' heliocentric distance, in AU.
Most Recent Update: 15 November 2006
