Extreme ultraviolet solar irradiance during the rising phase of solar cycle 24 observed by PROBA2/LYRA

Journal of Space Weather and Space Climate

Elke D’Huys²  Gaël Cessateur³  Joe Zender⁴  Marie Dominique²  Ingolf E. Dammasch²  Matthieu Kretzschmar¹ 

[1] LPC2E, UMR 6115 CNRS and University of Orléans, 3a av. de la recherche scientifique,45071 Orléans,France;Royal Observatory of Belgium/Solar Influence Data Analysis Center, av. circulaire 3,1180 Brussels,Belgium;Physikalisch-Meteorologisches Observatorium Davos and World Radiation Center (PMOD/WRC),Dorfstrasse 33,7260 Davos Dorf,Switzerland;ESA Research and Scientific Support Department, ESTEC,NL-2200 AG Noordwijk,The Netherlands

关键词: data analysis;    spectral irradiance;    solar cycle;    irradiance;   

Others  :  800682
DOI  :  doi:10.1051/swsc/2012014

 received in 2012-03-26, accepted in 2012-07-27,  发布年份 2012

【 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 spacecraft, PROBA2 (Project for OnBoard 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 those of SDO/EVE. We find that the solar EUV irradiance has increased by a factor of 2 since the last solar minimum (between solar cycles 23 and 24), which agrees reasonably well with the EVE observations.

【 授权许可】

   
© Owned by the authors, Published by EDP Sciences 2012

【 图 表 】

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Figure 15

Fig. 6

Fig. 7

Fig. 8

Fig. 9

【 参考文献 】

• [1]Benmoussa, A., I.E. Dammasch, J.-F. Hochedez, U. Schühle, S. Koller, et al., Pre-flight calibration of LYRA, the solar VUV radiometer on board PROBA2, A&A, 508, 1085–1094, 2009.
• [2]Dominique, M., J.-F. Hochedez, W. Schmutz, I.E. Dammasch, A.I. Shapiro, M. Kretzschmar, A.N. Zhukov, D. Gillotay, Y. Stockman, and A. Benmoussa, The LYRA instrument onboard PROBA2: description and in-flight performance, Sol. Phys., Submitted, 2012.
• [3]Dudok de Wit, T., and S. Bruinsma, Determination of the most pertinent EUV proxy for use in thermosphere modeling, Geophys. Res. Lett., 38, 19102, 2011.
• [4]Hochedez, J.-F., W. Schmutz, Y. Stockman, U. Schühle, A. Benmoussa, et al., Lyra, a solar UV radiometer on PROBA2, Adv. Space Res., 37, 303–312, 2006. [NASA ADS]
• [5]Lean, J., Solar ultraviolet irradiance variations – a review, J. Geophys. Res., 92, 839–868, 1987. [NASA ADS]
• [6]Lean, J.L., T.N. Woods, F.G. Eparvier, R.R. Meier, D.J. Strickland, J.T. Correira, and J.S. Evans, Solar extreme ultraviolet irradiance: present, past, and future, J. Geophys. Res., 116 (A1), 01, 2011.
• [7]Lilensten, J., T. Dudok de Wit, M. Kretzschmar, P.-O. Amblard, S. Moussaoui, J. Aboudarham, and F. Auchère, Review on the solar spectral variability in the EUV for space weather purposes, Ann. Geophys., 26, 269–279, 2008. [NASA ADS]
• [8]Solomon, S.C., T.N. Woods, L.V. Didkovsky, J.T. Emmert, and L. Qian, Anomalously low solar extreme ultraviolet irradiance and thermospheric density during solar minimum, Geophys. Res. Lett., 37, 16103, 2010. [NASA ADS]
• [9]Solomon, S.C., L. Qian, L.V. Didkovsky, R.A. Viereck, and T.N. Woods, Causes of low thermospheric density during the 2007–2009 solar minimum, J. Geophys. Res. (Space Phys.), 116, A00H07, DOI: 10.1029/2011JA016508, 2011.
• [10]Tobiska, W.K., Recent solar extreme ultraviolet irradiance observations and modeling: a review, J. Geophys. Res., 98, 18879, 1993.
• [11]Woods, T.N., F.G. Eparvier, S.M. Bailey, P.C. Chamberlin, J. Lean, G.J. Rottman, S.C. Solomon, W.K. Tobiska, and D.L. Woodraska, Solar EUV experiment (see): mission overview and first results, J. Geophys. Res. (Space Phys.), 110, 1312, 2005. [NASA ADS]
• [12]Woods, T.N., F.G. Eparvier, R. Hock, A.R. Jones, D. Woodraska, et al., Extreme ultraviolet variability experiment (EVE) on the solar dynamics observatory (SDO): overview of science objectives, instrument design, data products, and model developments, Sol. Phys., 275, 115–143, 2012. [NASA ADS]