Odyssey GRS Averaged HEND Data (AHD)

AHD – Averaged HEND Data

Instrument: Odyssey Gamma Ray Spectrometer

PDS Data Set ID: ODY-M-GRS-5-AHD-V1.0 DOI: 10.17189/1519475

For more information about GRS AHD products, see the Data Set Catalog File.

For more information about GRS AHD processing, see the HEND Data Processing document.

For more information about GRS IDR products, see the GRS IDR Product SIS.

The Gamma Ray Spectrometer Intermediate Data Record (GRSIDR) Averaged HEND Data (AHD) data products are tables that contain averaged normalized counting rates, orbital neutron fluxes and the associated timing, spatial, and engineering information for each of the five neutron signals obtained by HEND’s four detectors that have been summed by signal over 5-degree by 5-degree latitude longitude cells on the surface of Mars over a time period of 15 degrees of solar longitude (Ls).

The five neutron signals of interest are the following.

  • Small Detector, SD, energy range 0.4 eV to 1 keV

  • Medium Detector, MD, energy range 10 eV to 100 keV

  • Large Detector, LD, energy range 10 eV to 1 MeV

  • Inner Scintillator, IN_SC_LOW, neutron pulse height 1 MeV to 2.5 MeV

  • Inner Scintillator, IN_SC_HIGH, neutron pulse height > 2.5 MeV

The AHD is intended to be the second intermediate data product available for the HEND portion of the GRS. These data should be useful to those scientists who are experienced in neutron spectroscopy.

GRS AHD products have the following file names:

AHD_yy_nnn_mmm.DAT (with detached PDS label)

where:

yy = Mars Odyssey mapping year field (2 digits)

nnn = starting solar longitude (3 digits)

mmm = ending solar longitude (3 digits)

In ODE, AHD products have the following Product IDs:

AHD_YY_NNN_MMM