PROBA2/LYRA观测的第24太阳周上升期极紫外太阳辐照度
Extreme Ultraviolet Solar Irradiance during the rising phase of solar cycle 24 observed by PROBA2/LYRA
摘要：
大当量辐射计（LYRA）是一种自2010年1月以来以高频率和四个通带监测太阳辐照度的辐射计。该仪器及其航天器PROBA 2（机载自主项目）具有空间仪器的几个创新功能，这使得检索太阳辐照度长期变化所需的数据简化比完全优化的太阳物理学任务更加复杂。本文描述了如何计算LYRA的两个极紫外辐射通道的长期时间序列，并与SDO/EVE的结果进行了比较。我们发现，太阳EUV辐照度增加了一个因子2，因为最后一个太阳极小期（太阳活动周期23和24之间），这与EVE观测相当吻合。
英文摘要：
The Large Yield Radiometer (LYRA) is a radiometer that has monitored the solar irradiance at high cadence and in four pass bands since January 2010. Both the instrument and its space- craft, PROBA2 (Project for On-Board Autonomy), have several innovative features for space instrumentation, which makes the data reduction necessary to retrieve the long term variations of solar irradiance more complex than for a fully optimized solar physics mission. In this paper, we describe how we compute the long term time series of the two extreme ultraviolet irradiance channels of LYRA, and compare the results with SDO/EVE. We find that the solar EUV irradi- ance has increased by a factor 2 since the last solar minimum (between solar cycles 23 and 24), which agrees reasonably well with the EVE observations.
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