.png){kind=icon}
返回
Active region oscillations
.png){kind=icon}
OA
AI
DOI：10.1051/0004-6361:20010073.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
We report here on an investigation of high frequency oscillations in active regions, carried out using high cadence observations of O v 629 Angstrom, Mg IX 368 Angstrom and Fe XVI 335 Angstrom with the Coronal Diagnostic Spectrometer (CDS) on SOHO. Using the techniques of wavelet analysis on various temporal series datasets, we find that certain oscillation frequencies are favoured for each line. We find furthermore that a similar to5 min oscillation signature is commonly present in all lines, suggesting a coupling of the photospheric driver with the transition region and coronal loop modes. We report on the tendency for higher frequency oscillations to be present at lower intensity values, suggesting that higher frequency oscillations occur in interloop regions or at loop boundaries, possibly as a result of some resonant absorption process. In addition, we find that the coronal lines of Fe XVI and Mg Ix show more significant oscillations in the velocity than in the intensity, which suggests that in the velocity we measure additional non-compressive wave modes not visible in the intensity. As this effect is not seen in the transition region line of Ov it would seem that these additional non-compressive modes are produced in and limited to the corona. We suggest that there are two main mechanisms responsible for the observed oscillations; either resonant Alfven and/or fast kink waves or propagating slow magnetoacoustic waves, both present in coronal loops.
Keyword:
Sun : UV radiation : Sun : oscillations : Sun : waves : Sun : corona
期刊
IF:
5.8
论文数:
5.0W
被引数:
18.3W
机构
暂无机构信息
引用论文
The nutritional impact of diverting stoma-related complications in elderly rectal cancer patients
PREAI
分享收藏分享收藏Effect of Nanoencapsulated Alginate-Synbiotic on Gut Microflora Balance, Immunity, and Growth Performance of Growing Rabbits.png)
PolymersOAAI
PolymersIF0
OAAI分享收藏Wet oxidation properties of process waste waters of fine chemical and pharmaceutical origin精细化工和制药工艺废水的湿氧化性能
PREAI
分享收藏
查看更多内容