Data Base of Haleakala Neutron Monitor

Haleakala Neutron Monitor is situated in Haleakala, Hawaii
It is a project of Institute for the Study of Earth, Oceans, and Space

Latitude: 20.72N
Longitude: -156.28W
Altitude: 3030 m
Rigidity (1965): 12.91 GV
Standard atmoshperic pressure: 830 mb
Barometric coefficient (2004): -0.70 %/mb
SF=100 (The mean count is around 142000/hour or 2370/min,)

Dr. Clifford Lopate
Morse Hall, Univ. of New Hampshire
39 College Road, Durham, NH 03824-3525
Tel: 603-862-0322
Fax: 603-862-1915
E-mail Dr. Clifford Lopate
Personalia Dr. Clifford Lopate

Database contents of Haleakala neutron monitor data starting from February 1991 (12IGY). The interval of accumulation: hourly from 1991; besides, 1-minute data from 1991. An interactive access is possible to this database and FTP as well.

Interactive access

Data in this regime are available in graphical and in digital presentation as well. All graphical plots are given relative to February 1987.

Access by FTP

One-minute data are in directory ftp_NM1, hourly data in directory ftp_NM. Ground Level Enhancement (GLE) data are in the GLE directory. One-type data are presented in their own Format: hourly data in format C, 1-minute data in W format, and GLE data in GLE format.

There are three types of 1-minute data: neutron monitor data corrected for atmospheric pressure (C), atmospheric pressure (P), and neutron monitor data uncorrected for atmospheric pressure (U). Hourly data are presented uncorrected (U) and corrected for atmospheric pressure (P). Pressure corrected hourly data are kept as original (O) and corrected (C).