Search Results - "Shapiro, A. I"

Modeling Stellar Ca ii H and K Emission Variations: Spot Contribution to the S-index by Sowmya, K., Shapiro, A. I., Rouppe van der Voort, L. H. M., Krivova, N. A., Solanki, S. K.

“…Abstract The S -index is a measure of emission in the Ca ii H and K lines and is a widely used proxy of stellar magnetic activity. It has been assumed until…”
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Impact of a potential 21st century "grand solar minimum" on surface temperatures and stratospheric ozone by Anet, J. G., Rozanov, E. V., Muthers, S., Peter, T., Brönnimann, S., Arfeuille, F., Beer, J., Shapiro, A. I., Raible, C. C., Steinhilber, F., Schmutz, W. K.

“…We investigate the effects of a recently proposed 21st century Dalton minimum like decline of solar activity on the evolution of Earth's climate and ozone…”
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The LYRA Instrument Onboard PROBA2: Description and In-Flight Performance by Dominique, M., Hochedez, J.-F., Schmutz, W., Dammasch, I. E., Shapiro, A. I., Kretzschmar, M., Zhukov, A. N., Gillotay, D., Stockman, Y., BenMoussa, A.

“…The Large Yield Radiometer (LYRA) is an XUV–EUV–MUV (soft X-ray to mid-ultraviolet) solar radiometer onboard the European Space Agency Project for On-Board…”
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Impact of solar versus volcanic activity variations on tropospheric temperatures and precipitation during the Dalton Minimum by Anet, J. G, Muthers, S, Rozanov, E. V, Raible, C. C, Stenke, A, Shapiro, A. I, Brönnimann, S, Arfeuille, F, Brugnara, Y, Beer, J, Steinhilber, F, Schmutz, W, Peter, T

“…The aim of this work is to elucidate the impact of changes in solar irradiance and energetic particles versus volcanic eruptions on tropospheric global climate…”
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Northern hemispheric winter warming pattern after tropical volcanic eruptions: Sensitivity to the ozone climatology by Muthers, S., Anet, J. G., Raible, C. C., Brönnimann, S., Rozanov, E., Arfeuille, F., Peter, T., Shapiro, A. I., Beer, J., Steinhilber, F., Brugnara, Y., Schmutz, W.

“…An important key for the understanding of the dynamic response to large tropical volcanic eruptions is the warming of the tropical lower stratosphere and the…”
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Signature of the 27-day solar rotation cycle in mesospheric OH and H2O observed by the Aura Microwave Limb Sounder by Shapiro, A V, Rozanov, E, Shapiro, A I, Wang, S, Egorova, T, Schmutz, W, Peter, Th

“…The mesospheric hydroxyl radical (OH) is mainly produced by the water vapor (H2 O) photolysis and could be considered as a proxy for the influence of the solar…”
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The coupled atmosphere–chemistry–ocean model SOCOL-MPIOM by Muthers, S, Anet, J. G, Stenke, A, Raible, C. C, Rozanov, E, Brönnimann, S, Peter, T, Arfeuille, F. X, Shapiro, A. I, Beer, J, Steinhilber, F, Brugnara, Y, Schmutz, W

“…The newly developed atmosphere–ocean–chemistry–climate model SOCOL-MPIOM is presented by demonstrating the influence of chemistry–climate interactions on the…”
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Forcing of stratospheric chemistry and dynamics during the Dalton Minimum by Anet, J. G, Muthers, S, Rozanov, E, Raible, C. C, Peter, T, Stenke, A, Shapiro, A. I, Beer, J, Steinhilber, F, Brönnimann, S, Arfeuille, F, Brugnara, Y, Schmutz, W

“…The response of atmospheric chemistry and dynamics to volcanic eruptions and to a decrease in solar activity during the Dalton Minimum is investigated with the…”
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Evaluation of the ECHAM family radiation codes performance in the representation of the solar signal by Sukhodolov, T, Rozanov, E, Shapiro, A. I, Anet, J, Cagnazzo, C, Peter, T, Schmutz, W

“…Solar radiation is the main source of energy for the Earth's atmosphere and in many respects defines its composition, photochemistry, temperature profile and…”
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The Solar Irradiance Spectrum at Solar Activity Minimum Between Solar Cycles 23 and 24 by Thuillier, G., Bolsée, D., Schmidtke, G., Foujols, T., Nikutowski, B., Shapiro, A. I., Brunner, R., Weber, M., Erhardt, C., Hersé, M., Gillotay, D., Peetermans, W., Decuyper, W., Pereira, N., Haberreiter, M., Mandel, H., Schmutz, W.

“…On 7 February 2008, the SOLAR payload was placed onboard the International Space Station . It is composed of three instruments, two spectrometers and a…”
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Eclipses Observed by Large Yield RAdiometer (LYRA) – A Sensitive Tool to Test Models for the Solar Irradiance by Shapiro, A. I., Schmutz, W., Dominique, M., Shapiro, A. V.

“…We analyze the light curves of the recent solar eclipses measured by the Herzberg channel (200 – 220 nm) of the Large Yield RAdiometer (LYRA) onboard Project…”
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Estimation of Spectral Solar Irradiance in the Ecliptic Plane Using Synthetic Solar Surface Magnetograms by de Oliveira, I., Sowmya, K., Nèmec, N.‐E., Shapiro, A. I.

“…The primary external energy input to planetary atmospheres comes from solar radiation. Accurate estimates of solar irradiance are needed in order to understand…”
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Analysis of Different Solar Spectral Irradiance Reconstructions and Their Impact on Solar Heating Rates by Thuillier, G., Melo, S. M. L., Lean, J., Krivova, N. A., Bolduc, C., Fomichev, V. I., Charbonneau, P., Shapiro, A. I., Schmutz, W., Bolsée, D.

“…Proper numerical simulation of the Earth’s climate change requires reliable knowledge of solar irradiance and its variability on different time scales, as well…”
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Solar Spectral Irradiance Variability in November/December 2012: Comparison of Observations by Instruments on the International Space Station and Models by Thuillier, G., Schmidtke, G., Erhardt, C., Nikutowski, B., Shapiro, A. I., Bolduc, C., Lean, J., Krivova, N., Charbonneau, P., Cessateur, G., Haberreiter, M., Melo, S., Delouille, V., Mampaey, B., Yeo, K. L., Schmutz, W.

“…Onboard the International Space Station (ISS), two instruments are observing the solar spectral irradiance (SSI) at wavelengths from 16 to 2900 nm. Although…”
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The role of the solar irradiance variability in the evolution of the middle atmosphere during 2004-2009 by Shapiro, A. V., Rozanov, E. V., Shapiro, A. I., Egorova, T. A., Harder, J., Weber, M., Smith, A. K., Schmutz, W., Peter, T.

“…Recent measurements by the Spectral Irradiance Monitor (SIM) and the Solar Stellar Irradiance Comparison Experiment (SOLSTICE) onboard the Solar Radiation and…”
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The Dimmest State of the Sun by Yeo, K. L., Solanki, S. K., Krivova, N. A., Rempel, M., Anusha, L. S., Shapiro, A. I., Tagirov, R. V., Witzke, V.

“…How the solar electromagnetic energy entering the Earth's atmosphere varied since preindustrial times is an important consideration in the climate change…”
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Predictions of Astrometric Jitter for Sun-like Stars. III. Fast Rotators by Sowmya, K., Nèmec, N.-E., Shapiro, A. I., Işık, E., Krivova, N. A., Solanki, S. K.

“…Abstract A breakthrough in exoplanet detections is foreseen with the unprecedented astrometric measurement capabilities offered by instrumentation aboard the…”
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Faculae Cancel out on the Surfaces of Active Suns by Nèmec, N.-E., Shapiro, A. I., Işık, E., Sowmya, K., Solanki, S. K., Krivova, N. A., Cameron, R. H., Gizon, L.

“…Abstract Surfaces of the Sun and other cool stars are filled with magnetic fields, which are either seen as dark compact spots or more diffuse bright…”
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Modeling Stellar Ca ii H and K Emission Variations. I. Effect of Inclination on the S-index by Sowmya, K., Shapiro, A. I., Witzke, V., Nèmec, N.-E., Chatzistergos, T., Yeo, K. L., Krivova, N. A., Solanki, S. K.

“…Abstract The emission in the near-ultraviolet Ca ii H and K lines is modulated by stellar magnetic activity. Although this emission, quantified via the S…”
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Predictions of Astrometric Jitter for Sun-like Stars. II. Dependence on Inclination, Metallicity, and Active-region Nesting by Sowmya, K., Nèmec, N.-E., Shapiro, A. I., Işık, E., Witzke, V., Mints, A., Krivova, N. A., Solanki, S. K.

“…Abstract Ultra-precise astrometry from the Gaia mission is expected to lead to astrometric detections of more than 20,000 exoplanets in our Galaxy. One of the…”
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