Proc. of SOHO 13 ‘Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE’, Palma de Mallorca, Balearic Islands
نویسندگان
چکیده
We present a study of a high spatial resolution raster scan taken on-disk with the SoHO/SUMER spectrograph in a solar polar Coronal Hole (CH) region. We have analysed the line shifts and widths of two EUV emitting ions, O 703.87 Å and Mg 706.02 Å. Our results confirm plasma outflows from CHs. In particular, the correlation between the intensity and the Doppler velocity in the case of the O line constitute the lowest precise indication of fast wind streams seen originating from the network boundaries in the transition region.
منابع مشابه
Porting and Maintenance of Existing Code to the HMI Pipeline
Co-I Braun was on extended family leave for much of this quarter, due to the birth of his daughter on May 10. Other members spent considerable time preparing for, and attending, a number of summer workshops and conferences. These included the conference on “MHD Waves and oscillations in solar magnetic structures” in Palma de Mallorca, Spain (May 29 Jun 1), the SPD meeting in Durham, New Hampshi...
متن کاملتأثیر وشکسانی تراکمی بر وجوه نوسانات آرام حلقههای غیرهمگن تاج خورشید
In this paper, the effect of compressive viscosity on the slow mode oscillation of solar corona loops is studied. The coronal loops medium are considered in low beta condition, uniform magnetic field in the presence of gravitational stratification and temperature gradient. Two-dimensional Magneto-Hydro-Dynamics (MHD) equations are perturbed about the equilibrium and thenthese equations are lin...
متن کاملQuiet Sun EUV transient brightenings and turbulence A panoramic view by EIT on board SOHO
Since January 1996, the Extreme-Ultraviolet Imaging Telescope (EIT, onboard SOHO) has produced unique image sequences covering a wide field of view with a high temporal resolution, in the He ii transition region line and in several Fe coronal emission lines. Using two sequences acquired with cadences of the order of one minute and with durations ranging from one hour to several hours, we analys...
متن کاملFast solar wind acceleration by Alfvén waves: observable effects on the EUV lines detected by SOHO/UVCS
SOHO/UVCS observations of the most intense EUV spectral lines emitted by the solar corona have been providing us a good opportunity to study in detail the acceleration regions of the solar wind. In this work we aim at deriving useful diagnostics and identifying possible signatures of Alfvén waves momentum deposition. More specifically we investigate, with the help of a detailed wind model (Orla...
متن کاملLONG PERIOD OSCILLATIONS IN POLAR PLUMES AS OBSERVED BY CDS ON SoHO
We examine spectral time series of the transition region line O v 629 A, observed with the Coronal Diagnostic Spectrometer (CDS) on the SoHO spacecraft in July 1997. Both Fourier and wavelet transforms have been applied independently to the analysis of plume oscillations in order to nd the most reliable periods. The wavelet analysis allows us to derive the duration as well as the periods of the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004