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Table 4
Format for the tilt angle data derived from the sunspot groups observed by Schwabe, with format symbols as in Table 3.
| Field | Column | Format | Explanation | ||
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| YYYY | 1 | – | 4 | I4 | Year |
| MM | 6 | – | 7 | I2 | Month |
| DD | 9 | – | 10 | I2 | Day |
| HH | 12 | – | 13 | I2 | Hour |
| MI | 15 | – | 16 | I2 | Minute; mean local time in Dessau, Germany |
| GROUP | 18 | – | 25 | C8 | Group name based on Schwabe, but modified by our regrouping |
| SP | 27 | – | 28 | I2 | Number of spots in a group |
| ARA | 30 | – | 32 | I3 | Sum of umbral area of all spots in a group, in millionths of the solar hemisphere (MSH) |
| AWL.L | 34 | – | 38 | F5.1 | Area-weighted heliographic longitude of the group |
| AWB.B | 40 | – | 44 | F5.1 | Area-weighted heliographic latitude of the group |
| TILTAN | 46 | – | 51 | F6.2 | Tilt angle of the group; positive sign means leading polarity closer to equator in either hemisphere. This tilt angle was found using an isotropic search for the most likely dividing line between the polarities. |
| TILTHO | 53 | – | 58 | F6.2 | Tilt angle computed as in Howard (1991) for compatibility reasons. It is based on a fixed vertical dividing line between the polarities and an approximative formula for the tilt angle. |
| POLSP | 60 | – | 64 | F5.2 | Polarity separation of the group in degrees on the solar sphere. This and the following items are based on the polarity definition for TILTAN. |
| FN | 66 | – | 67 | I2 | Number of spots in the following polarity |
| LN | 69 | – | 70 | I2 | Number of spots in the leading polarity |
| FAR | 72 | – | 74 | I3 | Umbral area of the following polarity, in MSH |
| LAR | 76 | – | 78 | I3 | Umbral area of the leading polarity, in MSH |
| FLL.L | 80 | – | 84 | F5.1 | Area-weighted longitude of the following polarity |
| FBB.B | 86 | – | 90 | F5.1 | Area-weighted latitude of the following polarity |
| LLL.L | 92 | – | 96 | F5.1 | Area-weighted longitude of the leading polarity |
| LBB.B | 98 | – | 102 | F5.1 | Area-weighted latitude of the leading polarity |
| GFC | 104 | – | 108 | F5.1 | Heliocentric distance of the group from the disk centre in degrees |
Notes. All areas are based on the UMB column in Table 3.
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