SOI Data Programs - prog:lowl

The data in this program are derived from datasets imported from the Low-l instrument operated on Mauna Loa by the High Altitude Observatory.

These data belong to Steve Tomczyk. Permission to use them must be granted by the owner or by the High-Altiude Observatory. Citation rules:

[HAO policy here]

For a general description of processing levels within the SOI database, see the SOI Datasets description.

lev1i: the Dopplergrams as provided by HAO (FITS files, one per image).
Associated Data Series: daily.
lev1.5: Level 1 datasets associated with ancillary data required for Level 2 processing.
Associated Data Series: hourly.
sht: Spherical-harmonic transform coefficients of Level-1 data.
Associated Data Series: 12-hour, annual.

daily: There is a single series, named lowl, containing all Dopplergrams obtained with the instrument. Within the series, observations made on each calendar day at the observatory are collected into a data set numbered YYYYMMDD, e.g. lowl[19930330], lowl[19930331], lowl[19930401], etc.. Each complete Level 1 data set should normally contain roughly 500 images, depending on the length of the observing day.
hourly: There is a single series, named lowl_v, containing all Dopplergrams obtained with the instrument. Within the series, observations made in each clock hour at the observatory are collected into a data set numbered sequentially from the hour beginning at 0 = 1994.02.25_18:24:42_UT. Each complete data set should contain 60 images.
Ylm: There are multiple series, named v_pox_lmin-lmax_length, containing spherical harmonic transform coefficients with the designated range of l from lmin through lmax over a time interval length. Within each series, data sets are numbered sequentially from the corresponding interval beginning at 0 = 1994.02.25_18:52:42_UT.

This page last reviewed 17 November, 1997.

Please address inquiries to Jesper Schou.

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