J/ApJ/936/122 Contents of solar cycle 23 and 24 limb CME (Dagnew+, 2022)
Effect of the Heliospheric State on CME Evolution.
Dagnew F.K., Gopalswamy N., Tessema S.B., Akiyama S., Yashiro S.
<Astrophys. J., 936, 122 (2022)>
=2022ApJ...936..122D 2022ApJ...936..122D
ADC_Keywords:Sun; Solar system; Stars, flare
Keywords: Solar coronal mass ejections ; Active sun ; Solar cycle ;
Solar flares ; Heliosphere ; Solar x-ray flares
Abstract:
The culmination of solar cycle 24 by the end of 2019 has created the
opportunity to compare the differing properties of coronal mass
ejections (CMEs) between two whole solar cycles: solar cycle 23 (SC
23) and solar cycle 24 (SC 24). We report on the width evolution of
limb CMEs in SCs 23 and 24 in order to test the suggestion by
Gopalswamy et al. that CME flux ropes attain pressure balance at
larger heliocentric distances in SC 24. We measure CME width as a
function of heliocentric distance for a significantly large number of
limb CMEs (∼1000) and determine the distances where the CMEs reach
constant width in each cycle. We introduced a new parameter, the
transition height (hc) of a CME, defined as the critical heliocentric
distance beyond which the CME width stabilizes to a quasi-constant
value. Cycle and phase-to-phase comparisons are based on this new
parameter. We find that the average value of hc in SC 24 is 62% higher
than that in SC 23. SC 24 CMEs attain their peak width at larger
distances from the Sun than SC 23 CMEs do. The enhanced transition
height in SC 24 is new observational ratification of the anomalous
expansion. The anomalous expansion of SC 24 CMEs, which is caused by
the weak state of the heliosphere, accounts for the larger
heliocentric distance where the pressure balance between CME flux rope
and the ambient medium is attained.
Description:
The Large Angle and Spectrometric Coronagraph (LASCO) on board the
Solar and Heliospheric Observatory (SOHO) mission has been providing
the most extensive CME images through its two externally occulted
wide-ranging field-of-view (FOV) telescopes C2 and C3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 600 Contents of solar cycle 23 limb CMEs
table2.dat 86 406 Contents of solar cycle 24 limb CMEs
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See also:
J/ApJ/903/118 : Solar coronal mass ejections with SOHO/LASCO (Dagnew+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 yr CME.Y [1996/2008] Year of CME appearance (1)
6- 7 I2 "month" CME.M Month of CME appearance (1)
9- 10 I2 d CME.D Day of CME appearance (1)
12- 13 I2 h CME.h Hour of CME appearance (1)
15- 16 I2 min CME.m Minute of CME appearance (1)
18- 19 I2 s CME.s Second of CME appearance (1)
21- 23 I3 deg Width [7/360] CME width
25- 28 I4 km/s Speed [95/2657]? CME speed (2)
30- 32 I3 deg PA [38/330] CME position angle
34- 38 F5.2 Rsun hc [2.21/20.7] CME transition height
40- 44 F5.2 Rsun hw [2.55/28.7] CME height of constant width
45 A1 --- f_hw [*] Flag on hw (3)
47- 51 F5.2 Rsun hwint [2.55/25.8] CME height of constant width
with interpolation
52- 53 A2 --- f_hwint Flag on hwint (4)
55- 58 I4 yr Flare.Y [1996/2008] Year of flare onset (1)
60- 61 I2 "month" Flare.M Month of flare onset (1)
63- 64 I2 d Flare.D Day of flare onset (1)
66- 67 I2 h FlareS.h Hour of flare onset (1)
69- 70 I2 min FlareS.m Minute of flare onset (1)
72- 73 I2 h FlareP.h ? Hour of flare peak (1)
75- 76 I2 min FlareP.m ? Minute of flare peak (1)
78- 81 A4 --- Size Soft X-ray flare size
83- 89 A7 deg Location CME Source location
91- 94 I4 --- AR [0/9997]? Active Region
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Note (1): All times are in UT.
Note (2): Speed not measurable for the 2006/12/06 event.
Note (3): Flag as follows:
* = Apparent hw: The actual hw is difficult to measure.
Note (4): Flag as follows:
** = Interpolated hw: hw estimated from intepolation/extrapolation.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 yr CME.Y [2009/2019] Year of CME appearance (1)
6- 7 I2 "month" CME.M [1/12] Month of CME appearance (1)
9- 10 I2 d CME.D [1/31] Day of CME appearance (1)
12- 13 I2 h CME.h [0/23] Hour of CME appearance (1)
15- 16 I2 min CME.m [0/57] Minute of CME appearance (1)
18- 19 I2 s CME.s [3/56] Second of CME appearance (1)
21- 23 I3 deg Width [6/360]? CME width
25- 28 I4 km/s Speed [101/3163] CME speed
30- 32 I3 deg PA [8/331] CME position angle
34- 38 F5.2 Rsun hc [2.81/22.75] CME transition height
40- 44 F5.2 Rsun hw [3.11/24.28] CME height of constant width
46- 49 I4 yr Flare.Y [2009/2019] Year of flare onset (1)
51- 52 I2 "month" Flare.M [1/12] Month of flare onset (1)
54- 55 I2 d Flare.D [1/31] Day of flare onset (1)
57- 58 I2 h FlareS.h [0/23] Hour of flare onset (1)
60- 61 I2 min FlareS.m [0/59] Minute of flare onset (1)
63- 64 I2 h FlareP.h [0/23]? Hour of flare peak (1)
66- 67 I2 min FlareP.m [0/59]? Minute of flare peak (1)
69- 72 A4 --- Size Soft X-ray flare size
74- 80 A7 deg Location CME Source location
82- 86 I5 --- AR [11036/12733]? Active Region
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Note (1): All times are in UT.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 24-Jun-2024