TEAM JUPITER. KATHERINE BLACKBURN· SETH BURLEIGH · JOSEPH TRAN. LaAces 2009-2010 Pre-Preliminary Design Review. MISSION GOAL.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
KATHERINE BLACKBURN· SETH BURLEIGH · JOSEPH TRAN
Pre-Preliminary Design Review
Our goal is to investigate the causes of atmospheric electrical conductivity as a function of altitude. The launch will take place at the Columbia Scientific Balloon Facility (CSBF), in Palestine, Texas on May 25, 2010.
Figure 1- Altitude as a function of conductivity. Most of the potential drop of the atmosphere occurs near the surface. Adapted from Reference 2.
Figure 2 – There is a quasi-sinusoidal behavior of the electrical field with respect to time as shown above. Adapted from Reference 2.
THEORY OF OPERATION: VOLTAGE DECAY
Equation 3 – Conductivity vs. exponential fit time constant
Equation 4 – Capacitor current vs. combined Gerdien and measurement capacitance and change in outer-inner cylinder voltage
Equation 5 – Conductivity
Equation 6 – Theoretical cylindrical capacitor capacitance
Equation - Gerdien capacitor current given V (outer voltage- inner voltage), L (length), a (conductivity), b(inner radius), and a (outer radius)
Equation - Critical mobility - the minimum ion mobility (drift velocity/electric field) that will be captured by the gerdien capacitor
ION CURRENT, BIAS VOLTAGE
ROLES AND STAFFING PLAN
K. Nagaraja, B.S.N. Prasad, N. Srinivas, M.S. Madhava, Electrical conductivity near the Earth's surface: Ion-aerosol model, Journal of Atmospheric and Solar-Terrestrial Physics, Volume 68, Issue 7, April 2006, Pages 757-768, (http://www.sciencedirect.com/science/ article/ B6VHB-4JDMR5M-1/2/607a27d56c6adbf8ce265ea1ad0d8e0a)
E.A. Bering, A.A. Few, J.R. Benbrook, The Global electric circuit, Journal of Physics Today, Volume 51, Issue 10, 1998, Pages 24-30
N. Ragini, T.S. Shashikumar, M.S. Chandrashekara, J. Sannappa, L. Paramesh, Temporal and vertical variations of atmospheric electrical conductivity related to radon and its progeny concentrations at Mysore, Indian Journal of Radio & Space Physics, Volume 37, August 2008, Pages 264-271
K.L. Aplin, A novel technique to determine atmospheric ion mobility spectra, Journal of Atmospheric and Oceanic Physics, January 2005, (arXiv:physics/0501129v1)
K.L. Aplin, Instrumentation for atmospheric ion measurements, University of Reading Department of Meteorology, August 2000, Pages 1-274
J.P. Scott and W.H. Evans, The electrical conductivity of clouds, Journal of Pure and Applied Geophysics, Volume 75, Issue 1, December 1969, Pages 219-232 (http://www.springerlink.com/content/x804k7123mqhn3r5/)
R.G. Harrison, A.J. Bennett, Cosmic ray and air conductivity profiles retrieved from early twentieth century balloon soundings of the lower troposphere, Journal of Atmospheric and Solar-Terrestrial Physics, Volume 69, November 2006, Pages 515-527
K.A. Nicholl, R.G. Harrison, A double gerdien instrument for simultaneous bipolar air conductivity measurements on balloon platforms, Journal of Review of Scientific Instruments, Volume 79, August 2008
K.L. Aplin, R.G. Harrison, A computer-controlled gerdien atmospheric ion counter, Journal of Review of Scientific Instruments, Volume 71, Issue 8, August 2000
B. Balsey, (2009). Aerosol size distribution . Retrieved from http://cires.colorado.edu/science/groups/balsley/research/aerosol-distn.html