Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e...5h&link_type=abstract
Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R
Other
Scientific paper
Using two observational data of a sunspot and a pore observed by Sobotka et al. (1997, A&A 328, 682 & 1999, ApJ 511, 436), it will be shown that area distribution of resolved umbral dots (UDs) is Gaussian. UDs are formed in an umbra, evolve and finally die. It seems reasonable to suggest that, if UDs have a typical size the frequency distribution function (FDF) of the areas of each UD series during its lifetime should be a normal (Gaussian) distribution. This FDF were carefully examined. In some cases, they did not follow a Gaussian distribution. To have a sufficient accuracy, the FDFs of areas of all instant UDs observed in all frames were separately drawn for the two measurements. The two FDFs exhibit peaks around area~0.07 arcsec^2 and long tiles towards large areas. However, it is suggested that a considerable number of instant UDs have not spatially been resolved from each other. Investigation of the temporal variations of the area of all UD series whose sizes exceed, e.g., 300 km in some frames during their life suggests a scenario for the observations: A second UD series has been formed at or approached to the vicinity of the first existing UD series in a certain frame (F1) so that they have not been resolved for sometime (until frame F2). After frame F2, probably one of the two following states has occurred: a) one of the UD series has disappeared away with no way of telling which one, or b) the distance between them has become large enough to be resolved by tracking algorithm but without knowing which one was registered as a newly formed UD series. This merging (separating) of UDs not only deforms the FDF of area but also causes registering both a wrong death (birth) of a UD series and a shorter or even longer lifetime for a UD series. The unresolved (merged or separated) UD series has been looked for. Two samples containing 416 (127) resolved UD series of total of 662 (171) equivalent to 5722 and 5341 instant UDs observed in the sunspot and in the pore, respectively. Two Gaussian functions are fitted on the two FDFs. The averaged areas (peaks) are at 0.0625 and 0.0713 arcsec^2, respectively. Therefore, the averaged effective diameters are 204 km and 218 km, respectively.
No associations
LandOfFree
Reconsidering and refining two old observational data to find the typical size of umbral dots does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reconsidering and refining two old observational data to find the typical size of umbral dots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reconsidering and refining two old observational data to find the typical size of umbral dots will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1782071