Browsing by Author "Hoppe, Ulf-Peter"

Now showing items 1-9 of 9

    • Electron loss and meteoric dust in the mesosphere 

      Friedrich, Martin; Rapp, Markus; Blix, Tom Arild; Hoppe, Ulf-Peter; Torkar, Klaus; Robertson, Scott; Dickson, S; Lynch, K. (2012)
      The ionosphere is always assumed to contain equal numbers of positive and negative charges in a given volume (quasineutrality). Hence fewer electrons than positive charges are an indication of negative charges other than ...

    • First in situ measurement of the vertical distribution of ice volume in a mesospheric ice cloud during the ECOMA/MASS rocket-campaign 

      Rapp, Markus; Strelnikova, Irina; Strelnikov, Boris; Latteck, Ralph; Baumgarten, Gerd; Li, Qiang; Megner, Linda; Gumbel, Jörg; Friedrich, Martin; Hoppe, Ulf-Peter; Robertson, Scott (2009)
      We present in situ observations of mesospheric ice particles with a new particle detector which combines a classical Faraday cup with the active photoionization of particles and subsequent detection of photoelectrons. Our ...

    • The Hotel Payload 2 campaign: Overview of NO, O and electron density measurements in the upper mesosphere and lower thermosphere 

      Enell, Carl-Fredrik; Hedin, Jonas; Stegman, Jacek; Witt, Georg; Friedrich, Martin; Singer, Werner; Baumgarten, Gerd; Kaifler, B.; Hoppe, Ulf-Peter; Gustavsson, Björn; Brandstrom, U.; Khaplanov, Mikhail; Kero, Antti; Ulich, Thomas; Turunen, E. (2011)
      The ALOMAR eARI Hotel Payload 2 (HotPay 2) rocket campaign took place at Andøya Rocket Range, Norway, in January 2008. The rocket was launched on January 31, 2008 at 19:14 UT, when auroral activity appeared after a long ...

    • Localized mesosphere-stratosphere-troposphere radar echoes from the E region at 69 degrees N: Properties and physical mechanisms 

      Rapp, Markus; Leitert, Lasse; Latteck, Ralph; Zecha, Marius; Hoffmann, Peter; Höffner, Josef; Hoppe, Ulf-Peter; La Hoz, Cesar; Thrane, Eivind (2011)
      We present the first observations, to our knowledge, of a new class of high-latitude mesosphere-stratosphere-troposphere radar echoes from the E region as observed with the Arctic Lidar Observatory for Middle Atmosphere ...

    • Mass analysis of charged aerosol particles in NLC and PMSE during the ECOMA/MASS campaign 

      Robertson, Scott; Horányi, Mihály; Knappmiller, Scott; Sternovsky, Zoltan; Holzworth, Robert H.; Shimogawa, Michelle M.; Friedrich, Martin; Torkar, Klaus; Gumbel, Jörg; Megner, Linda; Baumgarten, Gerd; Latteck, Ralph; Rapp, Markus; Hoppe, Ulf-Peter; Hervig, Mark E. (2009)
      MASS (Mesospheric Aerosol Sampling Spectrometer) is a multichannel mass spectrometer for charged aerosol particles, which was flown from the Andoya Rocket Range, Norway, through NLC and PMSE on 3 August 2007 and through ...

    • Multi-instrument comparisons of D-region plasma measurements 

      Friedrich, Martin; Torkar, Klaus; Hoppe, Ulf-Peter; Bekkeng, Tore Andre; Barjatya, Aroh; Rapp, Markus (2013)
      The ECOMA (Existence and Charge state Of Meteoric dust grains in the middle Atmosphere) series of sounding rocket flights consisted of nine flights with almost identical payload design and flight characteristics. All flights ...

    • Payload charging events in the mesosphere and their impact on Langmuir type electric probes 

      Bekkeng, Tore Andre; Barjatya, Aroh; Hoppe, Ulf-Peter; Pedersen, Arne; Moen, Jøran Idar; Friedrich, Martin; Rapp, Markus (2013)
      Three sounding rockets were launched from Andøya Rocket Range in the ECOMA campaign in December 2010. The aim was to study the evolution of meteoric smoke particles during a major meteor shower. Of the various instruments ...

    • Study of the seasonal ozone variations at European high latitudes 

      Werner, R.; Stebel, Kerstin; Hansen, Georg Heinrich; Hoppe, Ulf-Peter; Gausa, Michael; Kivi, R.; Gathen, P. von der; Orsolini, Yvan; Kilifarska, N. (2011)
      The geographic area at high latitudes beyond the polar circle is characterized with long darkness during the winter (polar night) and with a long summertime insolation (polar day). Consequentially, the polar vortex is ...

    • The ECOMA 2007 campaign: rocket observations and numerical modelling of aerosol particle charging and plasma depletion in a PMSE/NLC layer 

      Brattli, Alvin Andreas; Lie-Svendsen, Øystein; Svenes, Knut Ragnar; Hoppe, Ulf-Peter; Strelnikova, I.; Rapp, M.; Latteck, R.; Friedrich, M. (2009)
      The ECOMA series of rocket payloads use a set of aerosol particle, plasma, and optical instruments to study the properties of aerosol particles and their interaction with the ambient plasma environment in the polar mesopause ...