Why is the value of E10.7 in older model versions different from the v2.21 release?
As the accuracy and precision of the EUV wavelengths are improved in Model releases, the value of E10.7 will change since it is the inte-grated 1-105 nm EUV energy flux and the latter changes. As measurements improve through time, the value of E10.7, though changing, will more and more approach a fixed level for given solar conditions. For example, the 1-sigma E10 v1.15:v1.24 ratio is 6.15% while v1.20:v1.24 is 0.38%. See the discussion in version 2.21 release related to “Known differences…” items 3 and 4. We have identified a process to create a ” standard” by which to judge E10.7 and all other integrated irradiance proxies and work is progressing to create this standard. Our AFRL colleagues will create a several solar cycle derived F10.7 from an ensemble of satellite drag data and this independent measure of what the general level of solar flux should have been will be used to evaluate future E10.7.
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