Physics
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..154..385s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 154, no. 2, p. 385-391
Physics
18
Dwarf Stars, G Stars, K Stars, Periodic Variations, Stellar Activity, Stellar Spectra, Sun, Sunspot Cycle, Calcium, Emission Spectra, Hydrogen, Potassium
Scientific paper
Twenty-five-year records of relative Ca II H and K emission fluxes of lower Main-Sequence stars have been measured at Mount Wilson Observatory and reveal surface activity in most of the older G- and K-type dwarf stars that is similar to the aperiodical activity cycle of the contemporary Sun (i.e., the cyclic and the occasional episode of reduced activity in the past few centuries). We find an inverse relationship between the amplitude of the activity cycle and the length of the cycle for the ensemble of those solar-type stars. We also find a similar relationship using the 250-year sunspot record (Cycles 1 to 21). The similarity between the two inverse relationships for the solar-type stars observed for 25 years and the Sun for a longer interval of time may suggest one common underlying physical mechanism that is responsible for the variations in surface activity ranging from decades to centuries.
Baliunas Sallie L.
Soon Willie W.-H.
Zhang Qian
No associations
LandOfFree
Variations in surface activity of the Sun and solar-type stars 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 Variations in surface activity of the Sun and solar-type stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variations in surface activity of the Sun and solar-type stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1073126