This directory contains the IRTF Data Archive Weather information. The weather data is
collected for each 24 hour UTC period. The data includes:
data/ - various .txt file and graphs for weather and see data.
tau225.txt - timestamps and values are for TAU 225GHz optical depth from the
SMA weather site.
The SMA home page is https://www.cfa.harvard.edu/sma/.
dimm.txt - timestamps and values for DIMM seeing values are from the CFHT
weather server.
The CFHT home page is http://cfht.hawaii.edu/
mass.txt - timestamp and values are for MASS seeing values from the CFHT
weather server.
The CFHT home page is http://cfht.hawaii.edu/
hum_ext.txt - External Humidity from the IRTF sensors HE1 (0-100)
temp_ext.txt - External Air Temperature from the IRTF sensors TE2, in degC.
temp_dome.txt - Internal Dome temperature from an IRTF sensors TD6, in degC.
wind_sp.txt - External mean wind speed from an IRTF sensor WMSPD1, m/s.
wind_dir.txt - External wind direction from an IRTF sensor WDIR1 (N=0, E=90, S=180, W=270).
tcs_mode.txt - The Telescope Control System (TCS) Mode: 0=Stop, 1=MP, 2=MV, 3=Track, 4=Slew
mir_covers.txt - The state of the TCS mirror covers: 0=Close, 1=Open
asiva_{z|h}_{ne|se|sw|nw}.txt -
** Project ended in 202308. See later. **
External ASIVA data values. 8 files are produced.
This data summaries the cloud coverage in a area the sky. File name indicate the area;
{z|h} indicates a elevation zone: z=2airmass to zenith; h= Horizon to 2 airmass.
{ne|se|sw|nw} indicate the azimuth zone: north-east, south-east, etc.
For example,the file asiva_h_ne.txt contains data for H (horizon-2Airmass) in the North-East.
A single value in the file provide a predictive value for the cloud coverage, where:
Value Condition Color
--------- ------------- -------
> 1.00 photometric Green
0.33-0.99 cirrus/cloudy Orange
< 0.33 cloudy Red
The colors are used on the weather graph and in ASIVA images.
weather_YYYMMDD.png - a graph of the above data is generated. The graph shows
a line plot for the various data for the UTC date. Most plot are
self-explanatory, but..
- ASIVA Data: The Asiva data show bar graph for each quadrant (NE, SE,
SW, NW). Since each quadrant has a Hor (Hor to 2 airmass), and Zen
(2 airmass to Zenith) value, they are stacked on each other, note the
2 dash lines.
- TCS Trk: This bar graph display green when the TCS is tracking and
the Mirror Covers are open.
- PROGRAM_ID data saved - Below the "TCS Trk", the time when data is
saved by each Program ID is plotted in orange; each line represents a
saved FITS file from Spex or iSHELL. The numbers on the left of the
graph show the number of files saved by each Program ID.
Below the graphs, a count of files saved by instrument code is displayed.
asiva/ -
**
Project ended in 202308.
It had been replaced by Nānā ao ...
https://www.cfht.hawaii.edu/en/gallery/nanaao.php ,
https://www.cfht.hawaii.edu/en/gallery/nanaao_data-access.php .
As of 20250402 software has yet to change to account for The Death of ASIVA.
**
The CFHT ASIVA is their All Sky Infrared Visible Analyzer. It is used for
cloud detection and coverage data.
The CFHT web link is: http://www.cfht.hawaii.edu/~asiva
The images are collected and the IRTF RA, DEC, Alt, Az, TCS MODE is written
in yellow on the top of each image.
The yellow "+" marks the approximate location of the IRTF telescope.
The PNG format files are used to create a movie (MPEG) of the entire night.
ASIVA images were being collected as of 8/5/2016.
hi_watervapor_band09/ - STAR images of Band 9 (IR: mid-level water vapor, wavelength: 6.9 um)
are saved here every hour. The project generates a JPEG
image every 5 minutes. At the end of UTC date,
hi_visible_band02.mp4 (MPEG) animation file is generated
from *.jpg files.
The Center for Satellite Applications and Research,
STAR, project:
https://www.star.nesdis.noaa.gov/
Image of GOES 17 satellite for Hawaii:
https://www.star.nesdis.noaa.gov/GOES/sector.php?sat=G17§or=hi
hi_infrared_band13/ - STAR images of Band 13 (IR: clean longwave window, wavelength: 10.3 um)
are saved here every hour. The project generates a JPEG
image every 5 minutes. At the end of UTC date,
hi_visible_band02.mp4 (MPEG) animation file is generated
from *.jpg files
The Center for Satellite Applications and Research, STAR, project:
https://www.star.nesdis.noaa.gov/
Images of GOES 17 satellite for Hawaii:
https://www.star.nesdis.noaa.gov/GOES/sector.php?sat=G17§or=hi