Energy spectra of helium, carbon, nitrogen, oxygen and iron from 1990 through 2010 at daily averaged time resolution: A new product and implications derived therefrom

Details Energy spectra of helium, carbon, nitrogen, oxygen and iron from 1990 through 2010 at daily averaged time resolution: A new product and implications derived therefrom Energy spectra of helium, carbon, nitrogen, oxygen and iron from 1990 through 2010 at daily averaged time resolution: A new product and implications derived therefrom

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b2002m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH31B-2002

Astronomy and Astrophysics

Astrophysics

[2114] Interplanetary Physics / Energetic Particles, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7984] Space Weather / Space Radiation Environment

Scientific paper

We present the results of a survey of energy spectra of protons, helium, carbon, oxygen, and iron for the rising phase of the current solar cycle through 1 July 2011 derived from the Advanced Composition Explorer EPAM and for the entire Ulysses mission spanning from late 1990 to mission-end in mid-2009 using two parameter composition aperture pulse height analyzer measurements for energies of about .3 to 10 MeV/nucleon. Examples will be shown of typical events as well as long term quiet interplanetary fluxes. This data set has been posted on the Virtual Energetic Particle Observatory and is available at Fundamental Technologies website (www.ftecs.com). We will describe the calibration procedures and comparisons with other observations at different spatial locations and energies. We have created daily-averaged 12-point energy spectra for helium, carbon, oxygen, neon, silicon, and iron. The data are in clear-text, comma separated ASCII files that can easily be ingested into most visualization software, custom code, or spreadsheet program. Each year's data file contains within its header a description of the various bins for the different ion species including upper and lower energy thresholds and the geometric factor for the C and D detectors at the base of the CA60 telescope on HISCALE. Each data record contains the year, the day of year, the duty cycle corrected accumulation time, and the number of counts for the day and flux for each of 12 energy channels for each of the six ion species. Having the raw counts for each day permits users to create averages over any number of days desired. One can easily create an average spectra for an event or CIR that is several days in duration. For periods in which the fluency is low, having the raw counts and the energy thresholds also permits one to integrate in energy as well and easily render six or four-point energy spectra when counts are low enough to pose statistical problems. We present several examples of situations for which this new data product may be utilized including event-averages, particle reservoir analysis, and analysis of quiescent periods between events.

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