SUMER DİNİ

SUMER observations of transition region fine structures

The SUMER (Solar Ultraviolet Measurements of Emitted Radiation) instrument on SOHO (Solar and Heliospheric Observatory) provides an opportunity to observe and study the solar transition region with high spatial and spectral resolution. We present new evidence to confirm that the emission from the quiet Sun at 2 × 105 K is dominated by cool loop-like fine structures which cluster across the chro...

Solar spicules and macrospicules observed by SUMER

Motivated by recent observations of spicules and macrospicules in the far-ultraviolet (FUV) wavelength range with the Solar Ultraviolet Measurements of Emitted Radiation spectrograph (SUMER) on the Solar and Heliospheric Observatory (SOHO), a generation mechanism for spicules and macrospicules is outlined which deviates significantly from most of the previous concepts. The important aspect is t...

Simultaneous Observations of the Solar Limb with TRACE and SUMER

SOHO/SUMER Observations of Prominence Oscillation Before Eruption

Context. Coronal mass ejections (CMEs), as a large-scale eruptive phenomenon, often reveal some precursors in the initiation phase, e.g., X-ray brightening, filament darkening, etc, which are useful for CME modeling and space weather forecast. Aims. With the SOHO/SUMER spectroscopic observations of the 2000 September 26 event, we propose another precursor for CME eruptions, namely, long-time pr...

Sumer Observations of the Quiet-sun Transition Region

We present new results from observations of the quiet Sun taken with the SUMER spectrograph on the SOHO spacecraft. This study includes line and continuum emission covering a wide range of temperatures, and the data have been used to create a number of intensity maps with a Ðeld of view of D60@@] 300@@ and a spatial resolution of D1A. These maps reveal bright features that extend from D6000 K t...