RStransfactor

[watsonm]

Mark,
With the introduction of the new RStransfactors :

RStransfactorJul=0.8
RStransfactorDec=0.8
BrasTurbidityJul=2.0
BrasTurbidityDec=2.0

Is the idea that:

July setting stretches from begining/end July to begining/end December and
December setting for begin/end December to begin/end July ??

which would make todays (April) setting RStransfactorDec

or

July setting is for begin/end december up to Begin/end July
Decemebr setting is for begin/end Jul up to begin/end December

which would make todays setting RStransfactorJul

did a scan of the WIki and forum as well as a quick scan of code but came up with nothing.

[mcrossley]

MX does a sinusoidal interpolation between the two values. So the factor changes very little either side of the solstices, with the maximum rate of change at the equinoxes.

(So actually more like a cosine interpolation!)

[watsonm]

Thanks Mark...

After I posted I thought I had discovered a test to work it out myself but could not really prove it.

May have another go tomorrow.

[watsonm]

My test this morning with a clearer head showed me that RStransfactorJul seems to refer to the first part of the year.

[sfws]

Mark -
The solstice is always in June, never July, (this year 21 June) so the factor you label as July is perhaps mislabelled on station settings --> Solar, with that correction the 2 factors will be correctly six-months apart, and your cosine variation will be equally balanced.

My test this morning with a clearer head showed me that RStransfactorJul seems to refer to the first part of the year.

Mike -
Are you misunderstanding Mark? Can I try a less technical way of explaining what his earlier post told you?
The factor you mention applies both before and after the June solstice, as you get closer to the two equinoxes, the December factor has more and more of an influence.
Equally, the December factor applies before and after the solstice in that month, but again as you get closer to either equinox, the first factor has more and more of an influence.

did a scan of the WIki

The technical terminology is now found here.

[mcrossley]

Mark -
The solstice is always in June, never July, (this year 21 June) so the factor you label as July is perhaps mislabelled on station settings --> Solar, with that correction the 2 factors will be correctly six-months apart, and your cosine variation will be equally balanced.

Opps! - The calculation does use June though!

And to the OP, the factor will be exactly half way between the two values at the equinoxes.

[watsonm]

Thanks Guys for the further explanation.

[sfws]

Opps! - The calculation does use June though!

Before you announce you have released 3.16 zip, (as I see you did the final commit yesterday*), please make it clear whether that fix involves an update to just the text in the settings screen, or whether it also involves the replacement of the line in Cumulus.ini

Code: Select all

[Solar]
RStransfactorJul=0.80000000000000004

If there is a replacement (because I have not checked your relevant code) by a more correctly named parameter, people need to know that file needs an update when they install the new release.

(It also helps anyone who is willing to keep the Wiki up to date, because other changes in this release implies there are lots of updates needed to Wiki - any volunteers?)

*EDIT : I see you did another edit about an hour after I posted this, but it was re High Gust alarm, not this.
Just to clarify, I was suggesting you make it clear in "release announcement", but by all means do another edit of "update text" if you think that is needed.

[mcrossley]

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