Multiwavelength Analysis of Network Bright Points - Coordinated Observations SOHO-GBO JOP No 37

Details Multiwavelength Analysis of Network Bright Points - Coordinated Observations SOHO-GBO JOP No 37 Multiwavelength Analysis of Network Bright Points - Coordinated Observations SOHO-GBO JOP No 37

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..184..261f&link_type=abstract

Third Advances in Solar Physics Euroconference: Magnetic Fields and Oscillations, ASP Conference Series vol.184, p. 261-265. Eds

Physics

1

Sun: Network, Oscillations, Transition Region, Space Observations

Scientific paper

We analyze the temporal behaviour of Network Bright Points (NBPs) using a set of data acquired during coordinated observations between ground based observatories (mainly at the NSO/Sacramento Peak) and the SUMER and MDI instruments onboard SOHO. We find that, at any time, all NBPs present in the NaD_2 images are co-spatial within 1" with locations of enhanced magnetic field density, and that not all the NBPs identified in the low chromosphere can be identified at higher levels. We calculate the intensity power spectrum for each NBP in several low-chromospheric signatures, such as the red wing of Hα, NaD_2 and Hα line center. The power spectra show no power at the 5.5 mHz frequency, while they display an enhancement at frequencies below 2 mHz, corresponding to periods between 8 and 20 minutes.

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