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Title: | L-Value and Energy Dependence of 0.1–50 keV O +, He +, and H + Ions for CME and CIR Storms Over the Entire Van Allen Probes Era |
Authors: | Pandya, Megha Veenadhari, B. Ebihara, Yusuke Reeves, G. D. |
Keywords: | L-Value CME CIR Storms Van Allen Probes |
Issue Date: | 2022 |
Citation: | JGR-Space Physics, https://doi.org/10.1029/2022JA030568 |
Abstract: | Our studies report the first observation of L-value and energy sorted correlation of differential fluxes of 0.1–50 keV O +, He +, and H + ions with different geophysical parameters for 29 Coronal Mass Ejected (CME) and 40 Corotating Interaction Region (CIR)-driven geomagnetic storms during the entire Van Allen Probes era. For both solar wind drivers, ions with ≥1 keV energies show more variability in response to the solar wind changes, while the lower energy (<1 keV) ions are relatively stable. During the in-storm interval, O + ions show maximum flux enhancement and become further prominent during CME storms. O + ion (≥10 keV) fluxes show good correlation with − VswBz, and Sym-H index during CME-driven storms in the L ∼2.5–5.5. Apart from this, the average duration of persistence (〈Δt〉) for enhanced fluxes is higher for CIR-driven storm𝐴𝐴s with ⟨Δ𝐴𝐴𝑡𝑡⟩𝑂𝑂+ >⟨Δ𝐴𝐴𝑡𝑡⟩𝐻𝐻𝐻𝐻+ >⟨Δ𝑡𝑡⟩𝐻𝐻+ at E ≤ 50 keV in the L ∼2.5–5.5. Moreover, the observed value of 〈Δt〉i (where i is O +, H + or He +) increases with the increasing L. We discuss the plausible mechanisms to provide a comprehensive overview of L-values and energy sorted O +, He + and H + ion dynamics for two different categories of solar wind drivers. |
URI: | http://library.iigm.res.in:8080/xmlui/handle/123456789/1681 |
Appears in Collections: | UAS_Reprints |
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VeenadhariB_etal_JGR-SpPhys_2022.pdf Restricted Access | 2.97 MB | Adobe PDF | View/Open Request a copy |
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