Doppler Shift Oscillations Observed with the EUV Imaging Spectrometer on Hinode

Details Doppler Shift Oscillations Observed with the EUV Imaging Spectrometer on Hinode Doppler Shift Oscillations Observed with the EUV Imaging Spectrometer on Hinode

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1301m&link_type=abstract

American Astronomical Society, SPD meeting #40, #13.01; Bulletin of the American Astronomical Society, Vol. 41, p.832

Astronomy and Astrophysics

Astronomy

Scientific paper

The EUV Imaging Spectrometer (EIS) on Hinode is capable of measuring Doppler shift fluctuations with amplitudes of less than 0.5 km/s. This, coupled with EIS's improved sensitivity over previous EUV spectrometers, has expanded the range of coronal oscillatory phenomena available for detailed study. For example, both kink mode and slow mode coronal loop oscillations have already been detected with EIS. We report on additional observations of Doppler shift and intensity oscillations in an active region observed in 2007 August. An initial periodogram analysis of portions of the data shows periods in the Doppler shift data of 9 to 10 minutes in emission lines with temperatures of formation from 1.2 to 2.1 MK. Periods of 8 to 12 minutes are seen in the detrended intensity data over the same temperature range. The EIS observations include density-sensitive emission lines from Fe XII and Fe XIII, allowing us to quantify density fluctuations. The Solar Optical Telescope on Hinode made simultaneous Ca II observations, which we have co-aligned with the EIS data to understand better the chromospheric environment in the oscillating region.
This work was supported by the NASA Hinode program.

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