J/MNRAS/503/1976 Rate coefficients and ion populations (Dufresne+, 2021)
The influence of photo-induced processes and charge transfer on carbon and
oxygen in the lower solar atmosphere.
Dufresne R.P., Del Zanna G., Badnell N.R.
<Mon. Not. R. Astron. Soc. 503, 1976-1986 (2021)>
=2021MNRAS.503.1976D 2021MNRAS.503.1976D (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: Sun: transition region - Sun: chromosphere - atomic data -
atomic processes - plasmas
Abstract:
To predict line emission in the solar atmosphere requires models which
are fundamentally different depending on whether the emission is from
the chromosphere or the corona. At some point between the two regions,
there must be a change between the two modelling regimes. Recent
extensions to the coronal modelling for carbon and oxygen lines in the
solar transition region have shown improvements in the emission of
singly- and doubly-charged ions, along with Li-like ions. However,
discrepancies still remain, particularly for singly-charged ions and
intercombination lines. The aim of this work is to explore additional
atomic processes that could further alter the charge state
distribution and the level populations within ions, in order to
resolve some of the discrepancies. To this end, excitation and
ionisation caused by both the radiation field and by atom-ion
collisions have been included, along with recombination through charge
transfer. The modelling is carried out using conditions which would be
present in the quiet Sun, which allows an assessment of the part
atomic processes play in changing coronal modelling, separately from
dynamic and transient events taking place in the plasma. The effect
the processes have on the fractional ion populations are presented, as
well as the change in level populations brought about by the new
excitation mechanisms. Contribution functions of selected lines from
low charge states are also shown, to demonstrate the extent to which
line emission in the lower atmosphere could be affected by the new
modelling.
Description:
The file ct_temps.dat gives the temperatures at which charge transfer
rate coefficients have been calculated. The file ct_rates.dat gives
the rate coefficients for charge transfer and charge transfer
ionisation resolved by initial and final levels where possible,
otherwise resolved by initial level only. Rate coefficients are only
given here for those transitions where rate coefficients were not
provided in the original sources. They were produced for this work
from the published cross sections given by those sources. Zero values
for rate coefficients mean the published cross sections were not given
at energies which are suitable to provide rate coefficients at those
temperatures. The file co_pict.dat gives the ion fractional
populations for each ion of carbon and oxygen at the temperatures
given in file tempions.dat, derived from the ionisation equilibrium at
a constant pressure of 3.0e+14 K/cm+3. The co_pict.dat file is in the
Chianti .ioneq file format. Details of methods for calculations are
given in the paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ct_temps.dat 210 1 Charge transfer rate coefficient temperatures
ct_rates.dat 271 15 Charge transfer rate coefficients
tempions.dat 366 1 Temperatures for ion fractional populations
co_pict.dat 616 16 Ion fractional populations at constant pressure
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Byte-by-byte Description of file: ct_temps.dat
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Bytes Format Units Label Explanations
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3- 10 E8.2 K Temp1 Temperature 1
13- 20 E8.2 K Temp2 Temperature 2
23- 30 E8.2 K Temp3 Temperature 3
33- 40 E8.2 K Temp4 Temperature 4
43- 50 E8.2 K Temp5 Temperature 5
53- 60 E8.2 K Temp6 Temperature 6
63- 70 E8.2 K Temp7 Temperature 7
73- 80 E8.2 K Temp8 Temperature 8
83- 90 E8.2 K Temp9 Temperature 9
93-100 E8.2 K Temp10 Temperature 10
103-110 E8.2 K Temp11 Temperature 11
113-120 E8.2 K Temp12 Temperature 12
123-130 E8.2 K Temp13 Temperature 13
133-140 E8.2 K Temp14 Temperature 14
143-150 E8.2 K Temp15 Temperature 15
153-160 E8.2 K Temp16 Temperature 16
163-170 E8.2 K Temp17 Temperature 17
173-180 E8.2 K Temp18 Temperature 18
183-190 E8.2 K Temp19 Temperature 19
193-200 E8.2 K Temp20 Temperature 20
203-210 E8.2 K Temp21 Temperature 21
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Byte-by-byte Description of file: ct_rates.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5 I1 --- El Atomic number of element
10 I1 --- Iion Number of electrons in initial ion
13- 23 A11 --- Iterm Configuration and term of initial state
33 I1 --- Fion Number of electrons in final ion
36- 46 A11 --- Fterm Configuration and term of final state
56 I1 --- Zpert Atomic number of perturber
61 I1 --- Pion Number of electrons in perturber initial state
64- 71 E8.3 cm+3/s Rate1 Rate coefficient at Temp1 (T=1.00E+03K)
74- 81 E8.3 cm+3/s Rate2 Rate coefficient at Temp2 (T=2.00E+03K)
84- 91 E8.3 cm+3/s Rate3 Rate coefficient at Temp3 (T=4.00E+03K)
94-101 E8.3 cm+3/s Rate4 Rate coefficient at Temp4 (T=6.00E+03K)
104-111 E8.3 cm+3/s Rate5 Rate coefficient at Temp5 (T=8.00E+03K)
114-121 E8.3 cm+3/s Rate6 Rate coefficient at Temp6 (T=1.00E+04K)
124-131 E8.3 cm+3/s Rate7 Rate coefficient at Temp7 (T=2.00E+04K)
134-141 E8.3 cm+3/s Rate8 Rate coefficient at Temp8 (T=4.00E+04K)
144-151 E8.3 cm+3/s Rate9 Rate coefficient at Temp9 (T=6.00E+04K)
154-161 E8.3 cm+3/s Rate10 Rate coefficient at Temp10 (T=8.00E+04K)
164-171 E8.3 cm+3/s Rate11 Rate coefficient at Temp11 (T=1.00E+05K)
174-181 E8.3 cm+3/s Rate12 Rate coefficient at Temp12 (T=2.00E+05K)
184-191 E8.3 cm+3/s Rate13 Rate coefficient at Temp13 (T=4.00E+05K)
194-201 E8.3 cm+3/s Rate14 Rate coefficient at Temp14 (T=6.00E+05K)
204-211 E8.3 cm+3/s Rate15 Rate coefficient at Temp15 (T=8.00E+05K)
214-221 E8.3 cm+3/s Rate16 Rate coefficient at Temp16 (T=1.00E+06K)
224-231 E8.3 cm+3/s Rate17 Rate coefficient at Temp17 (T=2.00E+06K)
234-241 E8.3 cm+3/s Rate18 Rate coefficient at Temp18 (T=4.00E+06K)
244-251 E8.3 cm+3/s Rate19 Rate coefficient at Temp19 (T=6.00E+06K)
254-261 E8.3 cm+3/s Rate20 Rate coefficient at Temp20 (T=8.00E+06K)
264-271 E8.3 cm+3/s Rate21 Rate coefficient at Temp21 (T=1.00E+07K)
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Byte-by-byte Description of file: tempions.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.2 K Temp1 Log temperature 1
7- 12 F6.2 K Temp2 Log temperature 2
13- 18 F6.2 K Temp3 Log temperature 3
19- 24 F6.2 K Temp4 Log temperature 4
25- 30 F6.2 K Temp5 Log temperature 5
31- 36 F6.2 K Temp6 Log temperature 6
37- 42 F6.2 K Temp7 Log temperature 7
43- 48 F6.2 K Temp8 Log temperature 8
49- 54 F6.2 K Temp9 Log temperature 9
55- 60 F6.2 K Temp10 Log temperature 10
61- 66 F6.2 K Temp11 Log temperature 11
67- 72 F6.2 K Temp12 Log temperature 12
73- 78 F6.2 K Temp13 Log temperature 13
79- 84 F6.2 K Temp14 Log temperature 14
85- 90 F6.2 K Temp15 Log temperature 15
91- 96 F6.2 K Temp16 Log temperature 16
97-102 F6.2 K Temp17 Log temperature 17
103-108 F6.2 K Temp18 Log temperature 18
109-114 F6.2 K Temp19 Log temperature 19
115-120 F6.2 K Temp20 Log temperature 20
121-126 F6.2 K Temp21 Log temperature 21
127-132 F6.2 K Temp22 Log temperature 22
133-138 F6.2 K Temp23 Log temperature 23
139-144 F6.2 K Temp24 Log temperature 24
145-150 F6.2 K Temp25 Log temperature 25
151-156 F6.2 K Temp26 Log temperature 26
157-162 F6.2 K Temp27 Log temperature 27
163-168 F6.2 K Temp28 Log temperature 28
169-174 F6.2 K Temp29 Log temperature 29
175-180 F6.2 K Temp30 Log temperature 30
181-186 F6.2 K Temp31 Log temperature 31
187-192 F6.2 K Temp32 Log temperature 32
193-198 F6.2 K Temp33 Log temperature 33
199-204 F6.2 K Temp34 Log temperature 34
205-210 F6.2 K Temp35 Log temperature 35
211-216 F6.2 K Temp36 Log temperature 36
217-222 F6.2 K Temp37 Log temperature 37
223-228 F6.2 K Temp38 Log temperature 38
229-234 F6.2 K Temp39 Log temperature 39
235-240 F6.2 K Temp40 Log temperature 40
241-246 F6.2 K Temp41 Log temperature 41
247-252 F6.2 K Temp42 Log temperature 42
253-258 F6.2 K Temp43 Log temperature 43
259-264 F6.2 K Temp44 Log temperature 44
265-270 F6.2 K Temp45 Log temperature 45
271-276 F6.2 K Temp46 Log temperature 46
277-282 F6.2 K Temp47 Log temperature 47
283-288 F6.2 K Temp48 Log temperature 48
289-294 F6.2 K Temp49 Log temperature 49
295-300 F6.2 K Temp50 Log temperature 50
301-306 F6.2 K Temp51 Log temperature 51
307-312 F6.2 K Temp52 Log temperature 52
313-318 F6.2 K Temp53 Log temperature 53
319-324 F6.2 K Temp54 Log temperature 54
325-330 F6.2 K Temp55 Log temperature 55
331-336 F6.2 K Temp56 Log temperature 56
337-342 F6.2 K Temp57 Log temperature 57
343-348 F6.2 K Temp58 Log temperature 58
349-354 F6.2 K Temp59 Log temperature 59
355-360 F6.2 K Temp60 Log temperature 60
361-366 F6.2 K Temp61 Log temperature 61
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Byte-by-byte Description of file: co_pict.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Z Atomic number of element
4- 6 I3 --- N Effective charge of ion
7- 16 E10.3 --- Pop1 Ion fractional population at Temp1, logTemp1=3.50
17- 26 E10.3 --- Pop2 Ion fractional population at Temp2, logTemp2=3.55
27- 36 E10.3 --- Pop3 Ion fractional population at Temp3, logTemp3=3.60
37- 46 E10.3 --- Pop4 Ion fractional population at Temp4, logTemp4=3.65
47- 56 E10.3 --- Pop5 Ion fractional population at Temp5, logTemp5=3.70
57- 66 E10.3 --- Pop6 Ion fractional population at Temp6, logTemp6=3.75
67- 76 E10.3 --- Pop7 Ion fractional population at Temp7, logTemp7=3.80
77- 86 E10.3 --- Pop8 Ion fractional population at Temp8, logTemp8=3.85
87- 96 E10.3 --- Pop9 Ion fractional population at Temp9, logTemp9=3.90
97-106 E10.3 --- Pop10 Ion fractional population at Temp10, logTemp10=3.95
107-116 E10.3 --- Pop11 Ion fractional population at Temp11, logTemp11=4.00
117-126 E10.3 --- Pop12 Ion fractional population at Temp12, logTemp12=4.05
127-136 E10.3 --- Pop13 Ion fractional population at Temp13, logTemp13=4.10
137-146 E10.3 --- Pop14 Ion fractional population at Temp14, logTemp14=4.15
147-156 E10.3 --- Pop15 Ion fractional population at Temp15, logTemp15=4.20
157-166 E10.3 --- Pop16 Ion fractional population at Temp16, logTemp16=4.25
167-176 E10.3 --- Pop17 Ion fractional population at Temp17, logTemp17=4.30
177-186 E10.3 --- Pop18 Ion fractional population at Temp18, logTemp18=4.35
187-196 E10.3 --- Pop19 Ion fractional population at Temp19, logTemp19=4.40
197-206 E10.3 --- Pop20 Ion fractional population at Temp20, logTemp20=4.45
207-216 E10.3 --- Pop21 Ion fractional population at Temp21, logTemp21=4.50
217-226 E10.3 --- Pop22 Ion fractional population at Temp22, logTemp22=4.55
227-236 E10.3 --- Pop23 Ion fractional population at Temp23, logTemp23=4.60
237-246 E10.3 --- Pop24 Ion fractional population at Temp24, logTemp24=4.65
247-256 E10.3 --- Pop25 Ion fractional population at Temp25, logTemp25=4.70
257-266 E10.3 --- Pop26 Ion fractional population at Temp26, logTemp26=4.75
267-276 E10.3 --- Pop27 Ion fractional population at Temp27, logTemp27=4.80
277-286 E10.3 --- Pop28 Ion fractional population at Temp28, logTemp28=4.85
287-296 E10.3 --- Pop29 Ion fractional population at Temp29, logTemp29=4.90
297-306 E10.3 --- Pop30 Ion fractional population at Temp30, logTemp30=4.95
307-316 E10.3 --- Pop31 Ion fractional population at Temp31, logTemp31=5.00
317-326 E10.3 --- Pop32 Ion fractional population at Temp32, logTemp32=5.05
327-336 E10.3 --- Pop33 Ion fractional population at Temp33, logTemp33=5.10
337-346 E10.3 --- Pop34 Ion fractional population at Temp34, logTemp34=5.15
347-356 E10.3 --- Pop35 Ion fractional population at Temp35, logTemp35=5.20
357-366 E10.3 --- Pop36 Ion fractional population at Temp36, logTemp36=5.25
367-376 E10.3 --- Pop37 Ion fractional population at Temp37, logTemp37=5.30
377-386 E10.3 --- Pop38 Ion fractional population at Temp38, logTemp38=5.35
387-396 E10.3 --- Pop39 Ion fractional population at Temp39, logTemp39=5.40
397-406 E10.3 --- Pop40 Ion fractional population at Temp40, logTemp40=5.45
407-416 E10.3 --- Pop41 Ion fractional population at Temp41, logTemp41=5.50
417-426 E10.3 --- Pop42 Ion fractional population at Temp42, logTemp42=5.55
427-436 E10.3 --- Pop43 Ion fractional population at Temp43, logTemp43=5.60
437-446 E10.3 --- Pop44 Ion fractional population at Temp44, logTemp44=5.65
447-456 E10.3 --- Pop45 Ion fractional population at Temp45, logTemp45=5.70
457-466 E10.3 --- Pop46 Ion fractional population at Temp46, logTemp46=5.75
467-476 E10.3 --- Pop47 Ion fractional population at Temp47, logTemp47=5.80
477-486 E10.3 --- Pop48 Ion fractional population at Temp48, logTemp48=5.85
487-496 E10.3 --- Pop49 Ion fractional population at Temp49, logTemp49=5.90
497-506 E10.3 --- Pop50 Ion fractional population at Temp50, logTemp50=5.95
507-516 E10.3 --- Pop51 Ion fractional population at Temp51, logTemp51=6.00
517-526 E10.3 --- Pop52 Ion fractional population at Temp52, logTemp52=6.05
527-536 E10.3 --- Pop53 Ion fractional population at Temp53, logTemp53=6.10
537-546 E10.3 --- Pop54 Ion fractional population at Temp54, logTemp54=6.15
547-556 E10.3 --- Pop55 Ion fractional population at Temp55, logTemp55=6.20
557-566 E10.3 --- Pop56 Ion fractional population at Temp56, logTemp56=6.25
567-576 E10.3 --- Pop57 Ion fractional population at Temp57, logTemp57=6.30
577-586 E10.3 --- Pop58 Ion fractional population at Temp58, logTemp58=6.35
587-596 E10.3 --- Pop59 Ion fractional population at Temp59, logTemp59=6.40
597-606 E10.3 --- Pop60 Ion fractional population at Temp60, logTemp50=6.45
607-616 E10.3 --- Pop61 Ion fractional population at Temp61, logTemp61=6.50
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Acknowledgements:
Roger Dufresne, rpd21(at)cam.ac.uk
Giulio Del Zanna, gd232(at)cam.ac.uk
Nigel Badnell, badnell(at)phys.strath.ac.uk
(End) Roger Dufresne [Cambridge Univ.], Patricia Vannier [CDS] 15-Apr-2021