Run, marking, seminar

That's the plan.

The run that finished overnight was Saturn100, a 50eV SD-C run. It was analysed, recoded and set off as SD-C for 12eV. The analysis showed that it was the final 50eV run, meaning all energies except 12, 40 and 100,000 are done, with the remaining 100k and 40eV runs underway. Half of all the remaining to be completed and analysed 18 runs are SD runs.

Ok seminar. Three bits. Modelling, Photon, Auroral morphology - not in that order.

Begin with the Earth, starting at Bolearis, then shift outwards, until the Earth is just another planet. Show that visible light is just one of the emissions and the list of emissions on all eight planets (including the null of Mercury). Talk about ENAs at Mercury and why it hasn't an aurora. Talk about the dynamo at Venus, the swept aurora and how this is being applied to Mars. Move onto the Giant Planets, with Jupiter's internal dynamo, Saturn's state of affairs, and mention the other two. Then talk about how particle interactions change the current only analogy sometimes used. Have the photon as an anology. Then use it to introduce RIDE and shine up a result or two. Then finish and run off to Mill Hill to avoid questions...

Ok, most the way through it now. Finished off tomorrow.

More stuff

One run finished overnight:

Saturn50 50eV SD-1. This was analysed, recoded as 12eV SD-1 and set off again. No grade changes.

Mill Hill

Quick note

Two completed runs:

Saturn5000 completed the 50eV SD+1 run, was analysed, recoded and set off as the 40eV SD+1 run (with a new 31 day runscript). Analysis saw no grade changes, but it did mean 22 runs were remaining to go - ie twice the number of available slots. Also, all 50eV runs and all 40eV runs were either done or going, indeed that is true for all energies except 12eV.

Saturn40 completed the 40eV SD+C run. This was analysed, recoded and reset off as the 12eV SD+C run. Analysis revealed no grade changes, but overall, we hit the 90% mark, so far as runs done goes.

Also spent half the (satur)day at Mill Hill, helping with the SPA tours.

Another quick note

One run ended today

Saturn1000 doing the final 50eV GS run (GS1m). It was recoded and set off as GS1m for 12eV. Analysis revealed no grade changes.

Quick note

One run and a bit of marking done so far today.

Saturn100 finished the 50eV SD-2 run, and was recoded and set off as the 50eV SD-C run, the only unfilled slot of that energy. Analysis revealed no grade changes.

Three runs - and marking

Three runs have finished overnight (well, they didn't finish in an overnight burst, they just happened to finish, after a long time, between me leaving last night and arriving today... but you know what I mean.. don't you?)

Saturn12 is the 12eV BSR1.0 run, finished with a day to spare... It was recoded, analysed and reset off as BSR0.9. Analysis gave no grade changes, but it did finally finish off the BSR1.0 set of runs, the first of the BSRs to finish.

Saturn50 is the 50eV GS10m run. This was analysed and then recoded as SD-1 (since the last 50eV GS run is already being done) and set off, meaning all six slots that are destined to attack the SD 12eV runs are in the SD block, ready to roll once they've done their stuff on 40, 50 and 1000 eV. No grade changes.

Saturn50000 was the 12eV BSR0.1 run. This was analysed and recoded as BSR0.25. Analysis revealed no grade chages, but BSR0.1 became the second BSR set to finish.

A good day for 12eV!

...and some marking...

Another quick note

Two runs finished today.

Saturn500 was the 40eV SD-2 run. This was analysed, recoded and set off as SD-C. This marked the 33 runs left point, meaning if all the runs not yet analysed were run in the eleven slots, they'd be used three times each. It also means that since eleven of them are running, that only twenty-two runs remain to be set off. No grade changes.

Saturn5000 was the 50eV SD+C run. This was analysed, recoded and set off as SD+1. Analysis brought 50eV up to a first, meaning all energies except 12eV are now on a first of one sort or another. 12eV remains a fail.

Couple 'a runs

Since Steve isn't in after all...

Two runs have finished overnight

Saturn50 finished the 50eV GS100m run. It was analysed, recoded as GS10m and set off again. No surprises or grade changes.

Saturn1000 finished the 100keV GS10m run. It was analysed, recoded as GS100m and set off again. No surprises or grade changes again.

Dealing with those wonderful cross-sections:
Straub et al 1996 - no further information to extract
Lindsay et al 2000 - dissociation cross-sections for NO, plus further references - mined
Mangan et al 2000 - CO dissociation cross-sections - mined
Deutsch et al 2002 - relevant to deeper model (ionisation of an ion)
Butler and Dalgarno 1979 - protons
Butler et al 1979 - protons
Bieniek and Dalgarno 1979 - protons
Tian and Vidal 1998 - information obtained
Tian and Vidal 1998a - relevant to deeper model, up to quadruple ionisation/dissociation
Tian and Vidal 1998b - relevant to deeper model with C2H2 and Ch4 cross-secs as well as CO
Tian and Vidal 1998c - CO2 dissociation - mined

Good, that's dissociation done as well as ionisation. Only require elastic scattering and maybe a few of the excitations to finish with.

Its amazing how large the NO dissociation cross-section is compared to its ionisation cross-section, compare to the disparity between say N2 or O2. Must be something to do with the heterogenaity of the atoms redistributing electron density unevenly across the bond. As ever.

Yep, same thing with the CO one.

Even worse for CO2, guess its because its polyatomic too.

So now have all appropriate dissociation and ionisation cross-sections, just missing elastic and (eventually) excitations, though the latter aren't necessary for immediate evaluations of the profiles.

Bits and bobs

Upgrade to titan's IDL install affected to allow running of Solar2000. Now works

Have been thinking again about the suicidal x-ray problem. Suicidal x-rays refer to the effect that an x-ray flux impacting on a neutral atmosphere will have. The atmosphere gets ionised by the impact, creating electrons. Electrons have a similar size to the wavelength of x-rays, which means Compton scattering cross-sections see their peak in the x-ray region. This, in turn means that x-rays get scattered more by the electrons they create. The effect of scattering is that x-rays lose energy and become EUV or less, meaning the x-ray flux kills itself. The chapman function method of calculating this is to apply the cf and have a compton scattering addition to the path length, ignoring the creation of EUV photons and concurrent destruction of x-rays, not to mention the directional effects of the scattering.

Another thought experiment has included space charges created in the aurorae and the currents created by the churning of background electrons to remove it. Though this effect is well known as it causes the induced currents that knock out powerlines and stations in powerful substorms, the heating effect in the upper atmosphere doesn't seem to be as well considered...

Of course, the majority of the work done today was on the Mars model, getting hold of, interpolating and extrapolating NO ionisation cross-sections. That is nitrogen monoxide, not "no" cross-sections... though the feeling did occur...

Saturn5000 slot run of 50eV in SD+2 mode completed. Analysis raised 50eV grade to 2i. Recoded as SD+C and set off again.

Another quick note

Two runs completed today:

Saturn50 finished the 50eV GS10km run. This was analysed, with no grade changes, and the next run set up and off.

Saturn12000 finished the 1keV SD-1 run. This was also anaylsed, set up and off again.