{
  "id": "1312.2002",
  "version": "v1",
  "published": "2013-12-06T07:28:27.000Z",
  "updated": "2013-12-06T07:28:27.000Z",
  "title": "Similarities and Distinctions in Cosmic-Ray Modulation during Different Phases of Solar and Magnetic Activity Cycles",
  "authors": [
    "O. P. M. Aslam",
    "Badruddin"
  ],
  "comment": "14 Pages, 7 figures and 9 tables; accepted to Solar Physics",
  "journal": "Solar Physics 289, 2247-2268, 2014",
  "doi": "10.1007/s11207-013-0459-5",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We study the solar-activity and solar-polarity dependence of galactic cosmic-ray intensity (CRI) on the solar and heliospheric parameters playing a significant role in solar modulation. We utilize the data for cosmic-ray intensity as measured by neutron monitors, solar activity as measured by sunspot number (SSN), interplanetary plasma/field parameters, solar-wind velocity [V] and magnetic field [B], as well as the tilt of the heliospheric current sheet [{\\Lambda}] and analyse these data for Solar Cycles 20 - 24 (1965 - 2011). We divide individual Solar Cycles into four phases, i.e. low, high, increasing, and decreasing solar activity. We perform regression analysis to calculate and compare the CRI-response to changes in different solar/interplanetary parameters during (i) different phases of solar activity and (ii) similar activity phases but different polarity states. We find that the CRI-response is different during negative (A<0) as compared to positive (A>0) polarity states not only with SSN and {\\Lambda} but also with B and V. The relative CRI-response to changes in various parameters, in negative (A<0) as compared to positive (A>0) state, is solar-activity dependent; it is ~2 to 3 times higher in low solar activity, ~1.5 to 2 times higher in moderate (increasing/decreasing) activity, and it is nearly equal in high solar-activity conditions. Although our results can be ascribed to preferential entry of charged particles via the equatorial/polar regions of the heliosphere as predicted by drift models, these results also suggest that we should look for, any polarity-dependent response of solar wind and transport parameters in modulating CRI in the heliosphere.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-12-06T07:28:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magnetic activity cycles",
      "cosmic-ray modulation",
      "parameters",
      "divide individual solar cycles",
      "polarity states"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Solar Physics",
      "year": 2014,
      "month": "Jun",
      "volume": 289,
      "number": 6,
      "pages": 2247
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014SoPh..289.2247A"
    }
  }
}