J/ApJS/183/225 A catalog of coronal "EIT wave" transients (Thompson+, 2009)
A catalog of coronal "EIT wave" transients.
Thompson B.J., Myers D.C.
<Astrophys. J. Suppl. Ser., 183, 225-243 (2009)>
=2009ApJS..183..225T 2009ApJS..183..225T
ADC_Keywords: Sun ; Ultraviolet
Keywords: Sun: corona - Sun: UV radiation - waves
Abstract:
Solar and Heliospheric Observatory (SOHO) Extreme ultraviolet Imaging
Telescope (EIT) data have been visually searched for coronal "EIT
wave" transients over the period beginning from 1997 March 24 and
extending through 1998 June 24. The dates covered start at the
beginning of regular high-cadence (more than 1 image every 20 minutes)
observations, ending at the four-month interruption of SOHO
observations in mid-1998. One hundred and seventy six events are
included in this catalog. The observations range from "candidate"
events, which were either weak or had insufficient data coverage, to
events which were well defined and were clearly distinguishable in the
data. Included in the catalog are times of the EIT images in which the
events are observed, diagrams indicating the observed locations of the
wave fronts and associated active regions, and the speeds of the wave
fronts. The measured speeds of the wave fronts varied from less than
50 to over 700km/s with "typical" speeds of 200-400km/s.
Description:
The catalog consists of all of the observations in the EIT 195Å
images, from January 1996 through June 1998, in which we were able to
find evidence of EIT wave-like phenomena.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 62 461 Full EIT wave catalog
notes.dat 76 16 Notes in table3
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1-176] Event running number
5- 14 A10 "YYYY/MM/DD" Date Date of the first image showing the wave
front (1)
16 A1 --- --- [Q]
17 I1 --- Qual [0,5] Quality rating, best is 5 (2)
19 A1 --- n_Qual [S] S means sharp waves
21- 23 I3 --- NSloc Apparent heliographic souce location N/S (3)
25- 27 I3 --- EWloc Apparent heliographic source location E/W (3)
29- 36 A8 "h:m:s" t(pre) Pre-event image time
38- 45 A8 "h:m:s" t(ima) Image time in which the wave is observed
47- 49 I3 km/s Speed ? Plane-of-Sky speed
51- 53 I3 km/s SpeedP ? Projected speed
55 A1 --- f_SpeedP [o] means "off limb" (4)
57- 58 A2 --- Dir [NESW ] Direction of measurement (NESW)
60- 62 I3 --- Note ? Note on event, detailed in notes.dat
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Note (1): In cases where the pre-event image listed in the catalog occurs
prior to 00:00 UT and the first image occurs after 00:00 UT, the date
of the pre-event image is 1 day before the listed date.
Note (2): Quality rating described (See section 2.3) as follows:
Q0 = Very low reliability; either a bright front with no clear evidence of
propagation, an extremely faint disturbance, or unusual structure. We
suspect that this category includes a number of weak waves as well as
non-related phenomena. <10% confidence level. (37 events from 176).
Q1 = Low reliability; either a faint bright front with structure which may
resemble those in the class 5 events, or some evidence of a propagating
brightening. 10-25% confidence level. (54 events)
Q2 = Low reliability; faint to strong bright front or a brightening which is
moving. 25-50% confidence level. (39 events)
Q3 = Intermediate reliability; Either multiple images of a propagating
brightening, or a clear observation of a bright front which is very
similar in structure to the class 5 waves. 50-75% confidence level.
(25 events).
Q4 = High reliability; Multiple images of a propagating brightening, spatial
correspondence from one image to the next, fairly high reliability.
Confidence level >75%. (16 events).
Q5 = Nearly definite reliability; Clear evidence of a propagating bright
front in multiple images, extent of the wave is far from other activity
such that the transient increase in emission is able to be distinguished
from other evolving features. 100% confidence level. (5 events)
Note (3): Typically, the location listed is the heliographic latitude and
longitude of an associated flaring/erupting active region. In the
cases where the active region was part of an extended complex, the
source location was identified as the location within the complex. For
the cases when the wave did not appear to originate at an active
region, the source location listed is either an evolving solar feature
or an apparently central origination point. A source longitude of 90
or -90 indicates that the apparent source of the wave was either at,
above, or possibly behind the solar limb.
Note (4): "off limb" = wave fronts were measured above the limb of the Sun,
in which case the Plane-of-Sky speed is a more accurate representation
of the wave speed.
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Note Note number
5- 76 A72 --- Text Text of note
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 11-Feb-2010