Daily Variability in the Terrestrial UV Airglow
Daily Variability in the Terrestrial UV Airglow
复制标题
陆地紫外线气辉的每日变化
DOI：
10.3390/atmos11101046
复制
发表时间：
2020
期刊：
影响因子：
2.9
通讯作者：
S. England
中科院分区：
文献类型：
--
作者：
T. Immel;R. Eastes;W. McClintock;S. Mende;H. Frey;C. Triplett;S. England
随着地球同步轨道全球紫外线（UV）成像的实施，观测高层大气条件的新能力随之而来。 NASA GOLD 任务观察到，133-168 nm 范围内的原子氧 (OI) 和分子氮 (N2) 的发射可用于表征热层这些主要成分的行为。 2019 年前 200 天的紫外线观测表明，135.6 nm 处的氧气发射与更广泛的莱曼-伯奇-霍普菲尔德 (LBH) 氮气发射有很大不同。这是通过每天同一时间监测两个彼此相距甚远的大约 1000 平方公里区域的平均仪器响应来确定的。确定了监测区域中 GOLD 对紫外线发射的响应变化，包括绝对值和相对于 GOLD 测量的 7 天运行平均值的变化。我们发现，两个不同区域的 N2 排放量变化显着相关，而每天同一固定地理区域在同一世界时间观察到的氧气排放量的相关性要低得多，并且与同一区域的 N2 排放量没有相关性。这表明，在 150-200 公里的气辉起源高度范围内，氧气密度的变化与氮气的变化无关，而氮气的变化在整个白天都有很好的相关性，表明与太阳极端紫外线通量的变化有直接联系。原子氧变化与太阳和地磁活动的关系也很低，表明存在改变热层中原子氧产生的区域源。
New capability for observing conditions in the upper atmosphere comes with the implementation of global ultraviolet (UV) imaging from geosynchronous orbit. Observed by the NASA GOLD mission, the emissions of atomic oxygen (OI) and molecular nitrogen (N2) in the 133–168-nm range can be used to characterize the behavior of these major constituents of the thermosphere. Observations in the ultraviolet from the first 200 days of 2019 indicate that the oxygen emission at 135.6 nm varies much differently than the broader Lyman-Birge-Hopfield (LBH) emission of N2. This is determined from monitoring the average instrument response from two roughly 1000 km2 areas, well separated from one another, at the same time of each day. Variations in the GOLD response to UV emissions in the monitored regions are determined, both in absolute terms and relative to a running 7-day average of GOLD measurements. We find that variations in N2 emissions in the two separate regions are significantly correlated, while oxygen emissions, observed in the same fixed geographic regions at the same universal time each day, exhibit a much lower correlation, and exhibit no correlation with the N2 emissions in the same regions. This indicates that oxygen densities in the airglow-originating altitude range of 150–200 km vary independently from the variations in nitrogen, which are so well correlated across the dayside to suggest a direct connection to variation in solar extreme-UV flux. The relation of the atomic oxygen variations to solar and geomagnetic activity is also shown to be low, suggesting the existence of a regional source that modifies the production of atomic oxygen in the thermosphere.
DOI：
10.1029/2020ja027823
发表时间：
2020-06
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
--
作者：
R. Eastes;W. McClintock;A. Burns;D. N. Anderson;L. Andersson;S. Aryal;S. Budzien;X. Cai;M. Codrescu;J. Correira;R. Daniell;K. Dymond;S. England;F. Eparvier;J. Evans;H. Foroosh;Q. Gan;K. Greer;D. Karan;A. Krywonos;F. Laskar;J. Lumpe;C. Martinis;J. McPhate;J. Oberheide;O. Siegmund;S. Solomon;V. Veibel;T. Woods
通讯作者：
R. Eastes;W. McClintock;A. Burns;D. N. Anderson;L. Andersson;S. Aryal;S. Budzien;X. Cai;M. Codrescu;J. Correira;R. Daniell;K. Dymond;S. England;F. Eparvier;J. Evans;H. Foroosh;Q. Gan;K. Greer;D. Karan;A. Krywonos;F. Laskar;J. Lumpe;C. Martinis;J. McPhate;J. Oberheide;O. Siegmund;S. Solomon;V. Veibel;T. Woods