Identification

Title

Turnover in Gleissberg Cycle dependence of inner zone proton flux

Abstract

The NOAA POES satellites orbit through the South Atlantic Anomaly (SAA) allowing access to the trapped inner belt high energy proton population. A previous study found a long‐term increase in proton flux averaged over the 11‐year solar cycle oscillation corresponding to solar activity consistent with the Centennial Gleissberg Cycle (CGC). F10.7 flux maxima have been decreasing over the ∼40‐year period of 1980–2021, correlating with an average increase in the varying proton population. Bregou et al. ’s (2022, https://doi.org/10.1029/2022sw003072 ) long‐term study of the peak flux over the SAA in NOAA‐15 shows an increase in proton flux from 1998 until 2021. The observed flux increase is correlated with both the ∼11‐year solar cycle and the overall decreasing F10.7 flux over the period studied. This long‐term decrease in F10.7 flux and increase in proton flux is concluded to be the manifestation of the CGC minimum and accompanying decrease in solar Extreme Ultraviolet irradiance (EUV). We extend Bregou et al., ’s (2022, https://doi.org/10.1029/2022sw003072 ) study to 2024 and observe a rapid increase in F10.7 flux at the beginning of Solar Cycle 25, a proxy for EUV, leading to increased proton loss to the expanding atmosphere and a steep decrease in the inner zone proton flux from 2022 to 2024 in NOAA‐15 and NOAA‐19 measurements. A model calculation of the inner zone proton flux generally agrees with the long‐term trend in flux magnitude.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.net/ark:/85065/d79k4gnm

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2025-03-01T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

<span style="font-family:Arial;font-size:10pt;font-style:normal;" data-sheets-root="1">Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.</span>

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact