Temporal Variability of Active Region Outflows

Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Movies are available at http://tcrb.nrl.navy.mil/~iuu/out/papers/2010_flows/. To be submitted to ApJ

Scientific paper

Recent observations from the Extreme-ultraviolet Imaging Spectrometer (EIS) on board Hinode have shown that low density areas on the periphery of active regions are characterized by strong blue-shifts at 1 MK. These Doppler shifts have been associated with outward propagating disturbances observed with Extreme-ultraviolet and soft X-ray imagers. Since these instruments can have broad temperature responses we investigate these intensity fluctuations using the monochromatic imaging capabilities of EIS and confirm their 1 MK nature. We also find that the Fe XII 195.119 A blue shifted spectral profiles at their footpoints exhibit transient blue wing enhancements on timescales as short as the 5 minute cadence. We have also looked at the fan peripheral loops observed at 0.6 MK in Si VII 275.368 A in those regions and find no sign of the recurrent outward propagating disturbances with velocities of 40 - 130 km/s seen in Fe XII. We do observe downward trends (15 - 20 km/s) consistent with the characteristic red-shifts measured at their footpoints. We, therefore, find no evidence that the structures at these two temperatures and the intensity fluctuations they exhibit are related to one another.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Temporal Variability of Active Region Outflows does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Temporal Variability of Active Region Outflows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temporal Variability of Active Region Outflows will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-331826

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.