The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The effect of active regions on the solar oscillations is simulated by artificially suppressing the velocities in full-disk quiet-sun Doppler images. An image of the active sun is used as a template to mask the regions within which the velocities are reduced by as much as 35%. Two-dimensional ℓ - ν power spectra from both the quiet sun and the masked data are compared. We find that the addition of...
The effects of the spatial filtering algorithm on the results of an inversion of high-degree solar oscillation data are examined. In attempting to isolate sectoral modes, the Fourier transforms in longitude are accompanied by three different spatial filterings in the orthogonal direction. The filters are: simple averaging in the plane of the sky, averaging along lines of constant heliographic longitude...
The contribution of the solar f modes of oscillation to the inversion of high-degree rotational splitting data is examined. We find that the f modes play an important role in such inversions as revealed by the magnitude of their weighting coefficients ci. This may be attributed to the single-peaked structure of the f-mode kernels, which is similar to that of the desired...
While the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) provides Doppler-velocity [V], continuum-intensity [IC], and line-depth [Ld] observations, each of which is sensitive to the five-minute acoustic spectrum, the Atmospheric Imaging Array (AIA) also observes at wavelengths – specifically the 1600 and 1700 Å bands – that are partly formed in the upper photosphere...
We present an overview of the data and models collected for the Whole Heliosphere Interval, an international campaign to study the three-dimensional solar–heliospheric–planetary connected system near solar minimum. The data and models correspond to solar Carrington Rotation 2068 (20 March – 16 April 2008) extending from below the solar photosphere, through interplanetary space, and down to Earth’s...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.