Possibilities For Situating A 1km2 Array
Stephen Fegan(UCLA)
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Lessons From Simulations
Simulations show elevation effect not so large. Can compensate with:
Slightly larger dish Higher QE
Construction and operation costs grow dramatically with elevation above 3.5km
ALMA: O2 required for all work at 5kmConstruction with portable O2 tanksControl building has O2 plumbing
Consider here viable sites from 3-4km
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Shuttle Radar Topography Mission
• NASA / NGA• STS-99, Feb 2000, 11 day on Endeavour• Surface elevation using radar interferometry • Between latitude of -56 and +60 (80% of world)• 1 arcsec horizontal accuracy (30m at equator)• 16m vertical accuracy• Data publicly available from JPL / USGS /
GLCF
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
SRTM Data Visualization
From NASA/JPL http://www2.jpl.nasa.gov/srtm/
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
SRTM Site Search
Search SRTM preliminary data set for Contiguous circular region With radius 720m (9×80m / 1.6km2) At elevation >2500m Flat to 100m Ignoring voids in data
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Search Results
Elevation Key
>2500m >3000m >3500m >4000m >4500m >5000m
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Search Results – Far West
Elevation Key
>2500m>3000m>3500m>4000m>4500m>5000m
Mexico
Guatemala
Hawaii
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Search Results – Near West
Elevation Key
>2500m>3000m>3500m>4000m>4500m>5000m
Argentina
Bolivia
Peru
Ecuador
Colombia
Chile
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Search Results – Near East
Elevation Key
>2500m>3000m>3500m>4000m>4500m>5000m
Nepal &China
Ethiopia
Kenya
Tanzania
Uganda
Congo
Iran
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Search Results – Far East
Elevation Key
>2500m>3000m>3500m>4000m>4500m>5000m
China
Indonesia (Papua)
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Hawaii
From Yahoo Travel http://travel.yahoo.com/ NASA Landsat / GLCF / http://landcover.org/
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Hawaii – Mauna Loa (Active Volcano)Hawaii – Mauna Loa
Distance E-W [km]
Dis
tan
ce N
-S [
km]
NASA SRTM and Landsat data fromJPL : http://www2.jpl.nasa.gov/srtm/GLCF : http://landcover.org/
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Mexico – Mexico City (Metro Region)Mexico – Mexico City
Distance E-W [km]
Dis
tan
ce N
-S [
km]
NASA SRTM and Landsat data fromJPL : http://www2.jpl.nasa.gov/srtm/GLCF : http://landcover.org/
Towards A Future Ground Based Gamma Ray Observatory October 20, 2005, Malibu, California
Possibilities For Situating A Square Kilometer Array Fegan, UCLA
Ecuador
Distance E-W [km]
Dis
tan
ce N
-S [
km]
NASA SRTM and Landsat data fromJPL : http://www2.jpl.nasa.gov/srtm/GLCF : http://landcover.org/