J/ApJS/262/44 Faculae, prominences & filaments in 1929-1944 (Carrasco+, 2022)
A catalog of faculae, prominences, and filaments for the period 1929-1944 from
the Astronomical Observatory of the University of Coimbra.
Carrasco V.M.S., Vaquero J.M.
<Astrophys. J. Suppl. Ser., 262, 44 (2022)>
=2022ApJS..262...44C 2022ApJS..262...44C
ADC_Keywords: Sun
Keywords: Astronomy databases ; Catalogs ; Sunspot cycle ; Sunspot groups
Abstract:
The Astronomical Observatory of the University of Coimbra (Portugal)
published a catalog with solar observations such as sunspots, faculae,
prominences, and filaments for the period 1929-1944. In previous
works, a machine-readable version on sunspot observations made in
Coimbra was published. Here we extend that work and present a digital
version of the facula, prominence, and filament observations made in
that observatory. We have applied a quality control to the catalog,
obtaining that the percentage of problematic or suspicious data found
is lower than 1% of the total number of observations. In addition, we
show an analysis of this catalog, as well as some comparisons between
solar indices calculated from Coimbra data and those from other
sources. Historical observations of faculae, prominences, and
filaments are not as common as sunspot records, and in addition, few
historical series of these solar features are available in digital
version. For that reason, the catalog of solar observations published
by the Coimbra Observatory is of enormous value. The recovery,
publication, and availability of this catalog provide the scientific
community with a valuable data set of solar characteristics that will
help us to study in more detail the past solar magnetic field and
long-term solar activity.
Description:
The Astronomical Observatory of the University of Coimbra (COI;
40°12'N 8°26'W) published almost a century ago a catalog with
daily solar observations made in this observatory from 1929 to 1944.
This catalog includes records of sunspots, faculae, prominences, and
filaments. The details on the methodology and the instruments used in
the observations were described in Carrasco+ (2018SoPh..293..153C 2018SoPh..293..153C) and
Lourenco+ (2019OAst...28..165L 2019OAst...28..165L).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 334 57848 The Astronomical Observatory of the University
of Coimbra (COI) catalog
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See also:
VI/138 : Sunspots catalogues, 1853-1870 (Casas+, 2013)
J/A+A/390/707 : Hemispheric Sunspot Numbers 1975-2000 (Temmer+, 2002)
J/A+A/447/735 : Hemispheric Sunspot Numbers 1945-2004 (Temmer+, 2006)
J/ApJ/721/901 : Solar quiescent filament channels (Su+, 2010)
J/A+A/584/A73 : Sunspot areas and tilt angles (Senthamizh Pavai+, 2015)
J/A+A/601/A106 : Sunspot on 1921-2011 (Mandal+, 2017)
J/A+A/601/A109 : Monthly numbers of sunspot groups 1749-1996 (Willamo+, 2017)
J/A+A/602/A69 : Group sunspot number series since 1739 (Chatzistergos+, 2017)
J/A+A/628/A103 : Mt Wilson sunspot magnetic field measurements (Pevtsov+, 2019)
J/ApJ/891/79 : Single storms and the related ICMEs from 1998-2011 (Li+, 2020)
J/ApJ/897/L10 : Disturbance storm time index (Hayakawa+, 2020)
J/A+A/639/A88 : Plage area composite series (Chatzistergos+, 2020)
J/A+A/640/A78 : Sunspot area catalogue revisited (1874-2019) (Mandal+, 2020)
J/A+A/647/A60 : Prominence mean magnetic fields in cycle XXI (Bommier+, 2021)
J/A+A/649/A141 : 1000-year sunspot series (Usoskin+, 2021)
J/A+A/652/A56 : Hemispheric Sunspot Numbers 1874-2020 (Veronig+, 2021)
J/ApJS/256/38 : SCO daily sunspot areas (1886-1940) (Carrasco+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Type Feature type (1)
12- 15 I4 yr Obs.Y [1929/1944] Observation year
17- 18 I2 "month" Obs.M Observation month
20- 21 I2 d Obs.D Observation day
23- 36 A14 --- Code ?=-9999 Code assigned (2)
38- 42 I5 --- Num [1/233]?=-9999 Number of elements in
facular group
44- 48 I5 --- Quad [1/13]?=-9999 Quandrant code (3)
50- 57 F8.2 deg LimLat1 [-89.5/89.5]?=-9999 First Latitude limit (4)
59- 66 F8.2 deg LimLat2 [-89/90]?=-9999 Second Latitude limit (4)
68- 72 I5 deg Lat [-73/73]?=-9999 COI Latitude (5)
74- 81 F8.2 deg LimLon1 [-120.4/180]?=-9999 First Longitue limit (6)
83- 90 F8.2 deg LimLon2 [-180/162]?=-9999 Second Longitue limit (6)
92- 96 I5 deg Lon [-87/88]?=-9999 COI Longitude (5)
98- 102 I5 --- Aread [58/41382]?=-9999 Solar disc area occupied
by faculae
104- 111 F8.2 --- Areah [-9990/73328]?=-9999 Solar hemisphere area
occupied by faculae (7)
113- 120 F8.2 deg BaseArc [0/9534]?=-9999 Base arc size
122- 131 F10.4 Rsun HeightR [0/1.5]?=-9999 Height relative in solar
radii
133- 140 F8.2 Mm HeightKM [1.4/264.1]?=-9999 Height in thousands of
kilometers
142- 146 I5 arcsec Height [6/807]?=-9999 Height in arcseconds
148- 152 I5 --- Area [0/6592]?=-9999 Area occupied by
prominences (7)
154- 158 I5 cRsun ExtCent [0/236]?=-9999 Filament extent in 0.01
solar radii
160- 334 A175 --- Note Other information of interest
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Note (1): Feature type as follows:
FACULA = 21626 occurrences
FILAMENT = 11590 occurrences
PROMINENCE = 24632 occurrences
Note (2): To each facula, prominence, and filament by the COI.
We assign zero if at least one observation was made
but no solar feature was observed.
Note (3): Quadrant code as follows:
1 = NW;
2 = SW;
3 = SE;
4 = NE.
Note (4): For each facula, prominence, and filament recorded by the
COI from 1929 to 1941. Positive values are for the northern
hemisphere and negative values for the southern hemisphere.
Note (5): Recorded by the COI for the faculae and prominences from 1942 to 1944.
Note (6): For each facula, prominence, and filament recorded by the
COI from 1929 to 1941. Positive values are for east and
negative for the west.
Note (7): In units of millionths of a solar hemisphere.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Nov-2022