scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Peculiarities in the start of solar cycle 24 Muraközy Judit , Ludmány András Heliophysical Observatory of the Hungarian Academy of Sciences The long-waited start of cycle 24 has arrived but some differences from previous cycles can already be identified. The present work is primarily based on Debrecen sunspot data. These data are detailed enough to study statistically the Spörer diagram of the individual cycles and it turns out that the present cycle starts at unusually low latitudes in both hemispheres. Some hints of the north-south phase lag are also scrutinized. Further properties of the minimum periods can also be compared, such as the number of spotless days, mean spot sizes and mean lifetimes of sunspot groups. At the present moment the recently available properties promise a fairly weak cycle.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Nine years of coincident measurements of PMSE and NLC above ALOMAR Kaifler Natalie , Baumgarten Gerd , Fiedler Jens , Latteck Ralph , Lübken Franz-Josef , Rapp Markus IAP Kühlungsborn Polar Mesospheric Summer Echoes (PMSE) and Noctilucent Clouds (NLC) are both layered phenomena of the cold summer mesopause. While NLC consist of ice particles large enough to be observed optically, the generation mechanism of PMSE requires also, but in a more subtle way, the presence of ice particles. PMSE are observed by different radars employing the backscatter on structures in electron density at the Bragg scale. At the ALOMAR research facility in Northern Norway (69N, 16E) different radar and lidar instruments are in operation since more than 10 years. We merge observations of PMSE by the ALWIN radar and observations of NLC by the ALOMAR Rayleigh-/Mie-/Raman lidar. We have analyzed about 2900 hours of lidar data and 13900 hours of radar data of the years 1999 to 2008. This unique dataset allows for simultaneous and common-volume studies of both phenomena. We present statistics on joint and sole occurrence of PMSE and NLC and its implications for cloud altitude and brightness. We find an increased probability for joint occurrence, confirming the supposed link between both phenomena, which is also strengthened by the cumulated coincidence of PMSE and NLC lower boundaries. However, we also observe NLC while PMSE is absent in the same volume. Comparison of occurrence rates with solar zenith angle reveals that NLC without PMSE mostly occur during night hours indicating that the ice particles were invisible to the radar due to the reduced electron density. We will present the joint observations on different time scales and quantify the link between PMSE and NLC. By this, we will assess the suitability of PMSE and NLC measurements as a tracer for parameters of the background atmosphere.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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