... Lord Carrington determined the solarrotation rate by watching low-latitude sunspots back in the 1850s. He defined a fixed solar coordinate system that rotates in a sidereal frame every 25.38 days. ...
... Due to the 7.2 degrees tilt of the solarrotation axis with respect to the normal of ... between geomagnetic/auroral activity and solarrotation period of 27 days was noted ...
... yy, last two digits of year 3- 4 i2 mm, month (1-12) 5- 6 i2 dd, day of month (1-31) 7-10 i4 Bartels solarrotation number - a sequence of 27-day intervals counted continuously from February 8, 1832 11-12 i2 Number of day within the Bartels 27-day cycle ...
... The most popular representation of the Kp indices is in form of the Bartels musical diagram ("musical scales"). most recent calculation and four complete solarrotations GIF or PS . ...
... The more moderate storms are often recurrent, i.e., they recur with the solarrotation period; see geomagnetic activity for more discussion about the observed periodicities in activity. ...
... BARTEL'S ROTATION NUMBER. The serial number assigned to 27-day rotation periods of solar and geophysical parameters. ... Dark gaseous ejections visible in H-ALPHA . DIFFERENTIAL ROTATION. The change in SOLARROTATION RATE with latitude. ...