Browsing by Author "Friedrich, Martin"

Now showing items 1-6 of 6

    • 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 ...

    • 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 ...