Search Publications
The 2012 July 23 Backside Eruption: An Extreme Energetic Particle Event?
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +3 more
The backside coronal mass ejection (CME) of 2012 July 23 had a short Sun-to-Earth shock transit time (18.5 hr). The associated solar energetic particle (SEP) event had a >10 MeV proton flux peaking at ∼5000 pfu, and the energetic storm particle event was an order of magnitude larger, making it the most intense event in the space era at these en…
Quasi-periodic Pulsations during the Impulsive and Decay phases of an X-class Flare
Hayes, L. A.; Gallagher, P. T.; Dennis, B. R. +3 more
Quasi-periodic pulsations (QPPs) are often observed in X-ray emission from solar flares. To date, it is unclear what their physical origins are. Here, we present a multi-instrument investigation of the nature of QPP during the impulsive and decay phases of the X1.0 flare of 2013 October 28. We focus on the character of the fine structure pulsation…
Radio Diagnostics of Electron Acceleration Sites During the Eruption of a Flux Rope in the Solar Corona
Gallagher, Peter T.; Carley, Eoin P.; Vilmer, Nicole
Electron acceleration in the solar corona is often associated with flares and the eruption of twisted magnetic structures known as flux ropes. However, the locations and mechanisms of such particle acceleration during the flare and eruption are still subject to much investigation. Observing the exact sites of particle acceleration can help confirm…
Effects of flare definitions on the statistics of derived flare distributions
Stegen, K.; Dominique, M.; Ryan, D. F. +2 more
The statistical examination of solar flares is crucial to revealing their global characteristics and behaviour. Such examinations can tackle large-scale science questions or give context to detailed single-event studies. However, they are often performed using standard but basic flare detection algorithms relying on arbitrary thresholds. This arbi…
Anomalous temporal behaviour of broadband Lyα observations during solar flares from SDO/EVE
Chamberlin, Phillip C.; Milligan, Ryan O.
Although it is the most prominent emission line in the solar spectrum, there has been a notable lack of studies devoted to variations in Lyα emission during solar flares in recent years. However, the few examples that do exist have shown Lyα emission to be a substantial radiator of the total energy budget of solar flares (of the order of 10%). It …
An Intense Flare-CME Event in 2015: Propagation and Interaction Effects Between the Sun and Earth's Orbit
Manoharan, P. K.; Johri, Abhishek
We report the interplanetary effects of a fast coronal mass ejection (CME) associated with the intense X2.7 flare that occurred on 05 May 2015. The near-Sun signatures of the CME at low-coronal heights [<2 R⊙] are obtained from the EUV images at 171 Å and metric radio observations. The intensity and duration of the CME-driven radio b…
Jets, Coronal “Puffs,” and a Slow Coronal Mass Ejection Caused by an Opposite-polarity Region within an Active Region Footpoint
Morgan, H.; Alzate, N.
During a period of three days beginning 2013 January 17, twelve recurrent reconnection events occur within a small region of opposing flux embedded within one footpoint of an active region, accompanied by flares and jets observed in EUV and fast and faint structureless “puffs” observed by coronagraphs. During the same period a slow structured CME …
The Blob Connection: Searching for Low Coronal Signatures of Solar Post-CME Blobs
Reeves, Katharine K.; Webb, David F.; Schanche, Nicole E.
Bright linear structures, thought to be indicators of a current sheet (CS), are often seen in Large Angle and Spectrometric Coronagraph (LASCO) on the Solar and Heliospheric Observatory (SOHO) white-light data in the wake of coronal mass ejections (CMEs). In a subset of these post-CME structures, relatively bright blobs are seen moving outward alo…
Lifecycle of a large-scale polar coronal pseudostreamer/cavity system
Auchère, Frédéric; Rachmeler, Laurel; Seaton, Daniel +1 more
We report on an exceptional large-scale coronal pseudostreamer/cavity system in the southern polar region of the solar corona that was visible for approximately a year starting in February 2014. It is unusual to see such a large closed-field structure embedded within the open polar coronal hole. We investigate this structure to document its format…
The ESPAS e-infrastructure: Access to data from near-Earth space
Hapgood, Mike; Belehaki, Anna; James, Sarah +9 more
ESPAS, the ;near-Earth space data infrastructure for e-science; is a data e-infrastructure facilitating discovery and access to observations, ground-based and space borne, and to model predictions of the near-Earth space environment, a region extending from the Earth's atmosphere up to the outer radiation belts. ESPAS provides access to metadata a…