EXPLANATIONS TO THE TABLES OF DEBRECEN PHOTOHELIOGRAPHIC DATA SUNSPOT CATALOGUE The tables contain three kinds of rows; they are explained separately. Rows beginning with character "d" (day): Column Character Fmt Description 1 1 A1 Data code: d 2 A1 Blank 2 3-6 I4 Year 7 A1 Blank 3 8-9 I2 Month 10 A1 Blank 4 11-12 I2 Day of month 13 A1 Blank 5 14-15 I2 Hour UT 16 A1 Blank 6 17-18 I2 Minute UT 19 A1 Blank 7 20-21 I2 Second UT 22 A1 Blank 8 23-26 A4 Origin of the observation: ABAS: Abastumani BOUL: Boulder DEBR: Debrecen EBRO: Ebro GYUL: Gyula HELW: Helwan HOLL: Holloman KANZ: Kanzelhoehe KIEV: Kiev KISL: Kislovodsk KODA: Kodaikanal MWIL: Mount Wilson RAME: Ramey SOHO: SOHO/MDI TASH: Tashkent 9 27-35 A9 Blank 10 36-40 I5 Daily sum of projected U (umbra) area in millionths of the solar disc 41 A1 Blank 11 42-46 I5 Daily sum of projected U+P (umbra + penumbra) area in millionths of the solar disc 47 A1 Blank 12 48-52 I5 Daily sum of corrected U in millionths of the solar hemisphere 53 A1 Blank 13 54-58 I5 Daily sum of corrected U+P in millionths of the solar hemisphere If every area data is 0, this means observation with no spots. 59 A1 Blank 14 60-72 F13.5 Julian Date (by convention .50000 represents 0000 UT) 73 A1 Blank 15 74-79 F6.2 P (position angle of the northern extremity of the axis of rotation, measured eastwards from the north point of the disk) at the time of the ground-based observation, or position angle of the solar north pole on the SOHO/MDI image. 80-81 A2 Blank 16 82-86 F5.2 B0(heliographic latitude of the central point of the disk on the observation) Rows beginning with character "g" (group) Column Character Fmt Description 1 1 A1 Data code: g 2 A1 Blank 2 3-6 I4 Year 7 A1 Blank 3 8-9 I2 Month 10 A1 Blank 4 11-12 I2 Day of month 13 A1 Blank 5 14-15 I2 Hour UT 16 A1 Blank 6 17-18 I2 Minute UT 19 A1 Blank 7 20-21 I2 Second UT 22 A1 Blank 8 23-28 A6 NOAA sunspot group number. If no NOAA number was assigned for the group, a NOAA number was given with an additional letter (e.g. "m", "n", etc.). 9 29-35 A7 Blank 10 36-40 I5 Total projected U (umbra) area of the group in millionths of the solar disc 41 A1 Blank 11 42-46 I5 Total projected U+P (umbra + penumbra) area of the group in millionths of the solar disc. 47 A1 Blank 12 48-52 I5 Total corrected U of the group in millionths of the solar hemisphere 53 A1 Blank 13 54-58 I5 Total corrected U+P of the group in millionths of the solar hemisphere 59 A1 Blank The following entries refer to the position of the given sunspot group, which is the mean position of its spots weighted by the U+P areas of the single spots. In the case of several umbrae within the same penumbra the mean weighted umbra position was calculated within their common penumbra prior to the calculation of group mean position. 14 60-65 F6.2 Heliographic latitude B; positive: North, negative: South 66 A1 Blank 15 67-72 F6.2 Heliographic longitude L 73 A1 Blank 16 74-79 F6.2 Longitudinal distance from the Sun's central meridian (LCM) 80 A1 Blank 17 81-86 F6.2 Position angle 87 A1 Blank 18 88-93 F6.4 Distance from the centre of Sun's disc measured in units of the solar radius If all the total areas are equal to zero and all the position data are equal to 999999, it means an intermittent phase of the group. Rows beginning with character "s" (spot) Column Character Fmt Description 1 1 A1 Data code: s 2 A1 Blank 2 3-6 I4 Year 7 A1 Blank 3 8-9 I2 Month 10 A1 Blank 4 11-12 I2 Day of month 13 A1 Blank 5 14-15 I2 Hour UT 16 A1 Blank 6 17-18 I2 Minute UT 19 A1 Blank 7 20-21 I2 Second UT 22 A1 Blank 8 22-28 A7 NOAA sunspot group number 29 A1 Blank 9 30-35 I3 No. of spot within the group 35 A1 Blank 10 36-40 I5 Projected U (umbra) area in millionths of the solar disc, negative values indicate that the umbra consists of fragmented regions which cannot be separated without losing umbral area. In this way several spots (intensity minima in the umbra) have a common umbra, e.g. -2 means that the given spot shares an umbra with spot No.2, and the common U value is indicated at spot No.2. 41 A1 Blank 11 42-46 I5 Projected U+P (umbra + penumbra) area in millionths of the solar disc, negative values indicate that several umbrae have a common penumbra, e.g. -7 means that the given umbra shares a penumbra with umbra No.7, and the U+P value is indicated at No.7. 47 A1 Blank 12 48-52 I5 Corrected U in millionths of the solar hemisphere, for negative values see Column 24-28. 53 A1 Blank 13 54-58 I5 Corrected U+P in millionths of the solar hemisphere, for negative values see Column 29-33. 59 A1 Blank 14 60-65 F6.2 Heliographic latitude B; positive: North, negative: South 66 A1 Blank 15 67-72 F6.2 Heliographic longitude L 73 A1 Blank 16 74-79 F6.2 Longitudinal distance from the Sun's central meridian (LCM) 80 A1 Blank 17 81-86 F6.2 Position angle 87 A1 Blank 18 88-93 F6.4 Distance from the centre of Sun's disc measured in units of the solar radius